Merge branch 'develop' of github.com:SnapKit/SnapKit into feature/release-5.6

.gitignore

@@ -1,3 +1,4 @@
+.build/
 project.xcworkspace
 xcuserdata
 Examples/
@@ -5,3 +6,4 @@ Examples/
 Gemfile
 Gemfile.lock
 *.sketch
+.swiftpm

.swift-version

@@ -1 +0,0 @@
-4.0

.travis.yml

@@ -1,10 +1,10 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode11
 
 env:
-  - ACTION=test  PLATFORM=Mac     DESTINATION='platform=OS X'
-  - ACTION=test  PLATFORM=iOS     DESTINATION='platform=iOS Simulator,name=iPhone 6S'
-  - ACTION=test  PLATFORM=tvOS    DESTINATION='platform=tvOS Simulator,name=Apple TV 1080p'
+  - ACTION=test  PLATFORM=Mac     DESTINATION='platform=macOS'
+  - ACTION=test  PLATFORM=iOS     DESTINATION='platform=iOS Simulator,name=iPhone 8'
+  - ACTION=test  PLATFORM=tvOS    DESTINATION='platform=tvOS Simulator,name=Apple TV 4K (at 1080p)'
 
 script:
   - set -o pipefail && xcodebuild -scheme SnapKit -destination "$DESTINATION" $ACTION | xcpretty

Example-iOS/AppDelegate.swift

@@ -13,7 +13,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
 
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 
         self.window = UIWindow(frame: UIScreen.main.bounds)
 
@@ -27,4 +27,4 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         
         return true
     }
-}
+}

Example-iOS/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example-iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -2,37 +2,52 @@
   "images" : [
     {
       "idiom" : "iphone",
-      "size" : "29x29",
-      "scale" : "2x"
+      "scale" : "2x",
+      "size" : "20x20"
     },
     {
       "idiom" : "iphone",
-      "size" : "29x29",
-      "scale" : "3x"
+      "scale" : "3x",
+      "size" : "20x20"
     },
     {
       "idiom" : "iphone",
-      "size" : "40x40",
-      "scale" : "2x"
+      "scale" : "2x",
+      "size" : "29x29"
     },
     {
       "idiom" : "iphone",
-      "size" : "40x40",
-      "scale" : "3x"
+      "scale" : "3x",
+      "size" : "29x29"
     },
     {
       "idiom" : "iphone",
-      "size" : "60x60",
-      "scale" : "2x"
+      "scale" : "2x",
+      "size" : "40x40"
     },
     {
       "idiom" : "iphone",
-      "size" : "60x60",
-      "scale" : "3x"
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
     }
   ],
   "info" : {
-    "version" : 1,
-    "author" : "xcode"
+    "author" : "xcode",
+    "version" : 1
   }
-}
+}

Example-iOS/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example-iOS/Example-iOS.xcodeproj/project.pbxproj

@@ -0,0 +1,360 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 52;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		440B451E25D8696C00334F54 /* ListViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 440B451B25D8696C00334F54 /* ListViewController.swift */; };
+		440B452125D869A700334F54 /* BasicUIScrollViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 440B451F25D869A700334F54 /* BasicUIScrollViewController.swift */; };
+		440B452225D869A700334F54 /* SimpleLayoutViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 440B452025D869A700334F54 /* SimpleLayoutViewController.swift */; };
+		440B452B25D86C0100334F54 /* SnapKit in Frameworks */ = {isa = PBXBuildFile; productRef = 440B452A25D86C0100334F54 /* SnapKit */; };
+		44477D7225D86845009F5E40 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 44477D7125D86845009F5E40 /* AppDelegate.swift */; };
+		44477D7B25D86846009F5E40 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 44477D7A25D86846009F5E40 /* Assets.xcassets */; };
+		44477D7E25D86846009F5E40 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 44477D7C25D86846009F5E40 /* LaunchScreen.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		440B451B25D8696C00334F54 /* ListViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ListViewController.swift; sourceTree = "<group>"; };
+		440B451F25D869A700334F54 /* BasicUIScrollViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = BasicUIScrollViewController.swift; path = demos/BasicUIScrollViewController.swift; sourceTree = "<group>"; };
+		440B452025D869A700334F54 /* SimpleLayoutViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = SimpleLayoutViewController.swift; path = demos/SimpleLayoutViewController.swift; sourceTree = "<group>"; };
+		440B452925D86BF200334F54 /* SnapKit */ = {isa = PBXFileReference; lastKnownFileType = folder; name = SnapKit; path = ..; sourceTree = "<group>"; };
+		44477D6E25D86845009F5E40 /* Example-iOS.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Example-iOS.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		44477D7125D86845009F5E40 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
+		44477D7A25D86846009F5E40 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		44477D7D25D86846009F5E40 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
+		44477D7F25D86846009F5E40 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		44477D6B25D86845009F5E40 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				440B452B25D86C0100334F54 /* SnapKit in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		440B452725D86BDF00334F54 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				440B452925D86BF200334F54 /* SnapKit */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
+		44477D6525D86845009F5E40 = {
+			isa = PBXGroup;
+			children = (
+				44477D7025D86845009F5E40 /* Example-iOS */,
+				44477D6F25D86845009F5E40 /* Products */,
+				440B452725D86BDF00334F54 /* Frameworks */,
+			);
+			sourceTree = "<group>";
+		};
+		44477D6F25D86845009F5E40 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				44477D6E25D86845009F5E40 /* Example-iOS.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		44477D7025D86845009F5E40 /* Example-iOS */ = {
+			isa = PBXGroup;
+			children = (
+				44477D7C25D86846009F5E40 /* LaunchScreen.storyboard */,
+				44477D7A25D86846009F5E40 /* Assets.xcassets */,
+				44477D7F25D86846009F5E40 /* Info.plist */,
+				44477D7125D86845009F5E40 /* AppDelegate.swift */,
+				440B451B25D8696C00334F54 /* ListViewController.swift */,
+				440B451F25D869A700334F54 /* BasicUIScrollViewController.swift */,
+				440B452025D869A700334F54 /* SimpleLayoutViewController.swift */,
+			);
+			name = "Example-iOS";
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		44477D6D25D86845009F5E40 /* Example-iOS */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 44477D8225D86846009F5E40 /* Build configuration list for PBXNativeTarget "Example-iOS" */;
+			buildPhases = (
+				44477D6A25D86845009F5E40 /* Sources */,
+				44477D6B25D86845009F5E40 /* Frameworks */,
+				44477D6C25D86845009F5E40 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = "Example-iOS";
+			packageProductDependencies = (
+				440B452A25D86C0100334F54 /* SnapKit */,
+			);
+			productName = "Example-iOS";
+			productReference = 44477D6E25D86845009F5E40 /* Example-iOS.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		44477D6625D86845009F5E40 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastSwiftUpdateCheck = 1250;
+				LastUpgradeCheck = 1250;
+				TargetAttributes = {
+					44477D6D25D86845009F5E40 = {
+						CreatedOnToolsVersion = 12.5;
+					};
+				};
+			};
+			buildConfigurationList = 44477D6925D86845009F5E40 /* Build configuration list for PBXProject "Example-iOS" */;
+			compatibilityVersion = "Xcode 9.3";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 44477D6525D86845009F5E40;
+			productRefGroup = 44477D6F25D86845009F5E40 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				44477D6D25D86845009F5E40 /* Example-iOS */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		44477D6C25D86845009F5E40 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				44477D7E25D86846009F5E40 /* LaunchScreen.storyboard in Resources */,
+				44477D7B25D86846009F5E40 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		44477D6A25D86845009F5E40 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				440B452225D869A700334F54 /* SimpleLayoutViewController.swift in Sources */,
+				440B451E25D8696C00334F54 /* ListViewController.swift in Sources */,
+				440B452125D869A700334F54 /* BasicUIScrollViewController.swift in Sources */,
+				44477D7225D86845009F5E40 /* AppDelegate.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXVariantGroup section */
+		44477D7C25D86846009F5E40 /* LaunchScreen.storyboard */ = {
+			isa = PBXVariantGroup;
+			children = (
+				44477D7D25D86846009F5E40 /* Base */,
+			);
+			name = LaunchScreen.storyboard;
+			sourceTree = "<group>";
+		};
+/* End PBXVariantGroup section */
+
+/* Begin XCBuildConfiguration section */
+		44477D8025D86846009F5E40 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 14.5;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		44477D8125D86846009F5E40 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 14.5;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		44477D8325D86846009F5E40 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				INFOPLIST_FILE = Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.Example-iOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		44477D8425D86846009F5E40 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				INFOPLIST_FILE = Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.Example-iOS";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		44477D6925D86845009F5E40 /* Build configuration list for PBXProject "Example-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				44477D8025D86846009F5E40 /* Debug */,
+				44477D8125D86846009F5E40 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		44477D8225D86846009F5E40 /* Build configuration list for PBXNativeTarget "Example-iOS" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				44477D8325D86846009F5E40 /* Debug */,
+				44477D8425D86846009F5E40 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		440B452A25D86C0100334F54 /* SnapKit */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = SnapKit;
+		};
+/* End XCSwiftPackageProductDependency section */
+	};
+	rootObject = 44477D6625D86845009F5E40 /* Project object */;
+}

Example-iOS/ListViewController.swift

@@ -39,8 +39,8 @@ class ListViewController: UITableViewController {
             let viewController = SimpleLayoutViewController()
             navigationController?.pushViewController(viewController, animated: true)
         } else if indexPath.row == 1 {
-            let viewController = ViewController()
+            let viewController = BasicUIScrollViewController()
             navigationController?.pushViewController(viewController, animated: true)
         }
     }
-}
+}

Package.swift

@@ -1,3 +1,4 @@
+// swift-tools-version:5.0
 //
 //  SnapKit
 //
@@ -25,5 +26,21 @@
 import PackageDescription
 
 let package = Package(
-    name: "SnapKit"
+    name: "SnapKit",
+    platforms: [
+        .iOS(.v10),
+        .macOS(.v10_11),
+        .tvOS(.v10)
+    ],
+    products: [
+        .library(name: "SnapKit", targets: ["SnapKit"]),
+        .library(name: "SnapKit-Dynamic", type: .dynamic, targets: ["SnapKit"]),
+    ],
+    targets: [
+        .target(name: "SnapKit", path: "Sources"),
+        .testTarget(name: "SnapKitTests", dependencies: ["SnapKit"]),
+    ],
+    swiftLanguageVersions: [
+        .v5
+    ]
 )

README.md

@@ -7,8 +7,8 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 [![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 
-#### ⚠️ **To use with Swift 3.x please ensure you are using >= 3.0.0** ⚠️ 
-#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️ 
+#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️
+#### ⚠️ **To use with Swift 5.x please ensure you are using >= 5.0.0** ⚠️
 
 ## Contents
 
@@ -22,9 +22,13 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 
 ## Requirements
 
-- iOS 8.0+ / Mac OS X 10.11+ / tvOS 9.0+
-- Xcode 9.0+
-- Swift 3.0+
+- iOS 10.0+ / Mac OS X 10.12+ / tvOS 10.0+
+- Xcode 10.0+
+- Swift 4.0+
+
+## Migration Guides
+
+- [SnapKit 3.0 Migration Guide](Documentation/SnapKit%203.0%20Migration%20Guide.md)
 
 ## Communication
 
@@ -55,7 +59,7 @@ platform :ios, '10.0'
 use_frameworks!
 
 target '<Your Target Name>' do
-    pod 'SnapKit', '~> 4.0.0'
+    pod 'SnapKit', '~> 5.0.0'
 end
 ```
 
@@ -79,11 +83,25 @@ $ brew install carthage
 To integrate SnapKit into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "SnapKit/SnapKit" ~> 4.0.0
+github "SnapKit/SnapKit" ~> 5.0.0
 ```
 
 Run `carthage update` to build the framework and drag the built `SnapKit.framework` into your Xcode project.
 
+### Swift Package Manager
+
+[Swift Package Manager](https://swift.org/package-manager/) is a tool for managing the distribution of Swift code. It’s integrated with the Swift build system to automate the process of downloading, compiling, and linking dependencies.
+
+> Xcode 11+ is required to build SnapKit using Swift Package Manager.
+
+To integrate SnapKit into your Xcode project using Swift Package Manager, add it to the dependencies value of your `Package.swift`:
+
+```swift
+dependencies: [
+    .package(url: "https://github.com/SnapKit/SnapKit.git", .upToNextMajor(from: "5.0.1"))
+]
+```
+
 ### Manually
 
 If you prefer not to use either of the aforementioned dependency managers, you can integrate SnapKit into your project manually.
@@ -105,6 +123,7 @@ class MyViewController: UIViewController {
         super.viewDidLoad()
 
         self.view.addSubview(box)
+        box.backgroundColor = .green
         box.snp.makeConstraints { (make) -> Void in
            make.width.height.equalTo(50)
            make.center.equalTo(self.view)
@@ -114,6 +133,13 @@ class MyViewController: UIViewController {
 }
 ```
 
+### Playground
+You can try SnapKit in Playground.
+
+**Note:**
+
+> To try SnapKit in playground, open `SnapKit.xcworkspace` and build SnapKit.framework for any simulator first.
+
 ### Resources
 
 - [Documentation](http://snapkit.io/docs/)

SnapKit.podspec

@@ -1,18 +1,18 @@
 Pod::Spec.new do |s|
   s.name = 'SnapKit'
-  s.version = '4.0.0'
+  s.version = '5.0.1'
   s.license = 'MIT'
   s.summary = 'Harness the power of auto layout with a simplified, chainable, and compile time safe syntax.'
   s.homepage = 'https://github.com/SnapKit/SnapKit'
   s.authors = { 'Robert Payne' => 'robertpayne@me.com' }
   s.social_media_url = 'http://twitter.com/robertjpayne'
-  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '4.0.0' }
+  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '5.0.1' }
 
-  s.ios.deployment_target = '8.0'
+  s.ios.deployment_target = '10.0'
   s.osx.deployment_target = '10.11'
-  s.tvos.deployment_target = '9.0'
+  s.tvos.deployment_target = '10.0'
 
-  s.source_files = 'Source/*.swift'
+  s.source_files = 'Sources/*.swift'
 
-  s.requires_arc = true
+  s.swift_version = '5.0'
 end

SnapKit.xcodeproj/project.pbxproj

@@ -8,6 +8,9 @@
 
 /* Begin PBXBuildFile section */
 		2DBA080E1F1FAD66001CFED4 /* Typealiases.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */; };
+		3CA7D6C224592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3CA7D6C124592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift */; };
+		7E1CB2AE227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E1CB2AD227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift */; };
+		7E1CB2B0227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7E1CB2AF227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift */; };
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 		EE235F6D1C5785C600C08960 /* Constraint.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F621C5785C600C08960 /* Constraint.swift */; };
 		EE235F701C5785C600C08960 /* ConstraintDescription.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235F631C5785C600C08960 /* ConstraintDescription.swift */; };
@@ -26,7 +29,7 @@
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+		EE235FB21C5785D400C08960 /* ConstraintMakerPrioritizable.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */; };
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@@ -36,7 +39,6 @@
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-		EECDB3741AC0C9B6006BBC11 /* SnapKit.h in Headers */ = {isa = PBXBuildFile; fileRef = EECDB3661AC0C95C006BBC11 /* SnapKit.h */; settings = {ATTRIBUTES = (Public, ); }; };
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@@ -48,7 +50,10 @@
 
 /* Begin PBXFileReference section */
 		2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Typealiases.swift; sourceTree = "<group>"; };
+		3CA7D6C124592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ConstraintMakerRelatable+Extensions.swift"; sourceTree = "<group>"; };
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+		7E1CB2AD227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConstraintDirectionalInsetTarget.swift; sourceTree = "<group>"; };
+		7E1CB2AF227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConstraintDirectionalInsets.swift; sourceTree = "<group>"; };
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 		EE235F631C5785C600C08960 /* ConstraintDescription.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintDescription.swift; sourceTree = "<group>"; };
@@ -67,7 +72,7 @@
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+		EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintMakerPrioritizable.swift; sourceTree = "<group>"; };
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@@ -76,14 +81,13 @@
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 		EE6898CA1DA7B3A100D47F33 /* LayoutConstraintItem.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LayoutConstraintItem.swift; sourceTree = "<group>"; };
+		EE6DB559251D9A6B00E0C374 /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		EE94F6081AC0F10A008767FF /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
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 		EEBCC9D819CC627D0083B827 /* SnapKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = SnapKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
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-		EECDB3661AC0C95C006BBC11 /* SnapKit.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SnapKit.h; sourceTree = "<group>"; };
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-		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Tests.swift; sourceTree = "<group>"; };
+		EECDB3691AC0C95C006BBC11 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = Info.plist; path = SnapKitTests/Info.plist; sourceTree = "<group>"; };
+		EECDB36A1AC0C95C006BBC11 /* Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Tests.swift; path = SnapKitTests/Tests.swift; sourceTree = "<group>"; };
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@@ -114,7 +118,8 @@
 		DDC9FD8C1981B4DD009612C7 = {
 			isa = PBXGroup;
 			children = (
-				EECDB35D1AC0C95C006BBC11 /* Source */,
+				EE6DB557251D9A6B00E0C374 /* Supporting Files */,
+				EECDB35D1AC0C95C006BBC11 /* Sources */,
 				EE94F60C1AC0F113008767FF /* Frameworks */,
 				DDC9FD961981B4DD009612C7 /* Products */,
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@@ -135,6 +140,7 @@
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 				EEF68FAF1D784FB100980C26 /* ConstraintLayoutGuide+Extensions.swift */,
 				EEF68FB31D784FBA00980C26 /* UILayoutSupport+Extensions.swift */,
+				3CA7D6C124592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift */,
 			);
 			name = Extensions;
 			sourceTree = "<group>";
@@ -155,7 +161,7 @@
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 				EE235FA71C5785D400C08960 /* ConstraintMakerFinalizable.swift */,
-				EE235FA81C5785D400C08960 /* ConstraintMakerPriortizable.swift */,
+				EE235FA81C5785D400C08960 /* ConstraintMakerPrioritizable.swift */,
 				EE235FA91C5785D400C08960 /* ConstraintMakerEditable.swift */,
 				EE235FAA1C5785D400C08960 /* ConstraintMakerRelatable.swift */,
 				EE235FAB1C5785D400C08960 /* ConstraintMakerExtendable.swift */,
@@ -172,6 +178,7 @@
 				EE235F911C5785CE00C08960 /* ConstraintMultiplierTarget.swift */,
 				EE235F921C5785CE00C08960 /* ConstraintOffsetTarget.swift */,
 				EE235F931C5785CE00C08960 /* ConstraintInsetTarget.swift */,
+				7E1CB2AD227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift */,
 			);
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 			sourceTree = "<group>";
@@ -183,6 +190,7 @@
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 				EE235F631C5785C600C08960 /* ConstraintDescription.swift */,
 				EE235F641C5785C600C08960 /* ConstraintInsets.swift */,
+				7E1CB2AF227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift */,
 				EE235F651C5785C600C08960 /* ConstraintConfig.swift */,
 				EE235F661C5785C600C08960 /* ConstraintView.swift */,
 				EEF68FBB1D78653000980C26 /* ConstraintLayoutGuide.swift */,
@@ -205,6 +213,14 @@
 			name = Debugging;
 			sourceTree = "<group>";
 		};
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@@ -215,20 +231,18 @@
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-				EECDB36B1AC0C967006BBC11 /* Supporting Files */,
 				EECDB3681AC0C95C006BBC11 /* Tests */,
 			);
-			path = Source;
+			path = Sources;
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@@ -241,14 +255,6 @@
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 			sourceTree = "<group>";
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 		};
@@ -305,23 +310,23 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 1230;
 				ORGANIZATIONNAME = "SnapKit Team";
 				TargetAttributes = {
 					EEBCC9D719CC627D0083B827 = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0900;
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 					EEBCC9E119CC627D0083B827 = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0900;
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 			buildConfigurationList = DDC9FD901981B4DD009612C7 /* Build configuration list for PBXProject "SnapKit" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
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@@ -371,6 +376,7 @@
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 				EEF68FBC1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAC1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
+				7E1CB2AE227BB5520066B6C0 /* ConstraintDirectionalInsetTarget.swift in Sources */,
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 				EE235F941C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
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@@ -384,13 +390,15 @@
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 				EE235F791C5785C600C08960 /* ConstraintView.swift in Sources */,
 				EE6898CB1DA7B3A100D47F33 /* LayoutConstraintItem.swift in Sources */,
-				EE235FB21C5785D400C08960 /* ConstraintMakerPriortizable.swift in Sources */,
+				EE235FB21C5785D400C08960 /* ConstraintMakerPrioritizable.swift in Sources */,
 				EE235F8B1C5785C600C08960 /* LayoutConstraint.swift in Sources */,
+				7E1CB2B0227BBDF70066B6C0 /* ConstraintDirectionalInsets.swift in Sources */,
 				EE235FA31C5785CE00C08960 /* ConstraintInsetTarget.swift in Sources */,
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 				EE235F5F1C5785BC00C08960 /* Debugging.swift in Sources */,
 				EE235FC31C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */,
+				3CA7D6C224592D4D005E10C2 /* ConstraintMakerRelatable+Extensions.swift in Sources */,
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@@ -412,6 +420,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
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 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -420,14 +429,17 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
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 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -469,6 +481,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -477,14 +490,17 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -523,15 +539,17 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = "$(SRCROOT)/Source/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Supporting Files/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_BUNDLE_PACKAGE_TYPE = FMWK;
 				PRODUCT_NAME = SnapKit;
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Debug;
@@ -546,14 +564,16 @@
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
-				INFOPLIST_FILE = "$(SRCROOT)/Source/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Supporting Files/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_BUNDLE_PACKAGE_TYPE = FMWK;
 				PRODUCT_NAME = SnapKit;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Release;
@@ -563,11 +583,13 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -576,12 +598,14 @@
 			buildSettings = {
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				DEVELOPMENT_TEAM = "";
-				INFOPLIST_FILE = "$(SRCROOT)/Tests/Info.plist";
+				INFOPLIST_FILE = "$(SRCROOT)/Tests/SnapKitTests/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks @loader_path/../Frameworks @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_BUNDLE_IDENTIFIER = "io.snapkit.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 4.0;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};

SnapKit.xcodeproj/xcshareddata/xcschemes/SnapKit.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "1230"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -27,6 +27,15 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "EEBCC9D719CC627D0083B827"
+            BuildableName = "SnapKit.framework"
+            BlueprintName = "SnapKit"
+            ReferencedContainer = "container:SnapKit.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
       <Testables>
          <TestableReference
             skipped = "NO">
@@ -39,17 +48,6 @@
             </BuildableReference>
          </TestableReference>
       </Testables>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "EEBCC9D719CC627D0083B827"
-            BuildableName = "SnapKit.framework"
-            BlueprintName = "SnapKit"
-            ReferencedContainer = "container:SnapKit.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -70,8 +68,6 @@
             ReferencedContainer = "container:SnapKit.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <AdditionalOptions>
-      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"

SnapKit.xcworkspace/contents.xcworkspacedata

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Workspace
    version = "1.0">
+   <FileRef
+      location = "group:SnapKitPlayground.playground">
+   </FileRef>
    <FileRef
       location = "container:SnapKit.xcodeproj">
    </FileRef>

SnapKit.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

SnapKitPlayground.playground/Contents.swift

@@ -0,0 +1,29 @@
+//: A UIKit based Playground for presenting user interface
+// To use this playground, build SnapKit.framework for any simulator first.
+
+import SnapKit
+import UIKit
+import PlaygroundSupport
+
+class MyViewController : UIViewController {
+    override func loadView() {
+        let view = UIView()
+        view.backgroundColor = .white
+
+        let label = UILabel()
+        label.text = "Hello World!"
+        label.textColor = .black
+        
+        view.addSubview(label)
+
+        label.snp.makeConstraints { (make) in
+            make.left.equalToSuperview().offset(150)
+            make.top.equalToSuperview().offset(200)
+            make.size.equalTo(CGSize(width: 200, height: 20))
+        }
+
+        self.view = view
+    }
+}
+// Present the view controller in the Live View window
+PlaygroundPage.current.liveView = MyViewController()

SnapKitPlayground.playground/contents.xcplayground

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='true'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

SnapKitPlayground.playground/playground.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+</Workspace>

SnapKitPlayground.playground/timeline.xctimeline

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Timeline
+   version = "3.0">
+   <TimelineItems>
+   </TimelineItems>
+</Timeline>

Source/ConstraintView+Extensions.swift

@@ -1,152 +0,0 @@
-//
-//  SnapKit
-//
-//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in
-//  all copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-//  THE SOFTWARE.
-
-#if os(iOS) || os(tvOS)
-    import UIKit
-#else
-    import AppKit
-#endif
-
-
-public extension ConstraintView {
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_left: ConstraintItem { return self.snp.left }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_top: ConstraintItem { return self.snp.top }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_right: ConstraintItem { return self.snp.right }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_bottom: ConstraintItem { return self.snp.bottom }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_leading: ConstraintItem { return self.snp.leading }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_trailing: ConstraintItem { return self.snp.trailing }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_width: ConstraintItem { return self.snp.width }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_height: ConstraintItem { return self.snp.height }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_centerX: ConstraintItem { return self.snp.centerX }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_centerY: ConstraintItem { return self.snp.centerY }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_baseline: ConstraintItem { return self.snp.baseline }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, OSX 10.11, *)
-    public var snp_lastBaseline: ConstraintItem { return self.snp.lastBaseline }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, OSX 10.11, *)
-    public var snp_firstBaseline: ConstraintItem { return self.snp.firstBaseline }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_leftMargin: ConstraintItem { return self.snp.leftMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_topMargin: ConstraintItem { return self.snp.topMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_rightMargin: ConstraintItem { return self.snp.rightMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_bottomMargin: ConstraintItem { return self.snp.bottomMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_leadingMargin: ConstraintItem { return self.snp.leadingMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_trailingMargin: ConstraintItem { return self.snp.trailingMargin }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_centerXWithinMargins: ConstraintItem { return self.snp.centerXWithinMargins }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_centerYWithinMargins: ConstraintItem { return self.snp.centerYWithinMargins }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_edges: ConstraintItem { return self.snp.edges }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_size: ConstraintItem { return self.snp.size }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public var snp_center: ConstraintItem { return self.snp.center }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_margins: ConstraintItem { return self.snp.margins }
-    
-    @available(iOS, deprecated:3.0, message:"Use newer snp.* syntax.")
-    @available(iOS 8.0, *)
-    public var snp_centerWithinMargins: ConstraintItem { return self.snp.centerWithinMargins }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public func snp_prepareConstraints(_ closure: (_ make: ConstraintMaker) -> Void) -> [Constraint] {
-        return self.snp.prepareConstraints(closure)
-    }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public func snp_makeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
-        self.snp.makeConstraints(closure)
-    }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public func snp_remakeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
-        self.snp.remakeConstraints(closure)
-    }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public func snp_updateConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
-        self.snp.updateConstraints(closure)
-    }
-    
-    @available(*, deprecated:3.0, message:"Use newer snp.* syntax.")
-    public func snp_removeConstraints() {
-        self.snp.removeConstraints()
-    }
-    
-    public var snp: ConstraintViewDSL {
-        return ConstraintViewDSL(view: self)
-    }
-    
-}

Source/Constraint.swift → Sources/Constraint.swift

@@ -49,12 +49,23 @@ public final class Constraint {
     public var layoutConstraints: [LayoutConstraint]
     
     public var isActive: Bool {
-        for layoutConstraint in self.layoutConstraints {
-            if layoutConstraint.isActive {
-                return true
+        set {
+            if newValue {
+                activate()
+            }
+            else {
+                deactivate()
+            }
+        }
+        
+        get {
+            for layoutConstraint in self.layoutConstraints {
+                if layoutConstraint.isActive {
+                    return true
+                }
             }
+            return false
         }
-        return false
     }
     
     // MARK: Initialization
@@ -118,6 +129,32 @@ public final class Constraint {
                         default:
                             fatalError()
                         }
+                    } else if self.from.attributes == .directionalEdges && self.to.attributes == .directionalMargins {
+                      switch layoutFromAttribute {
+                      case .leading:
+                        layoutToAttribute = .leadingMargin
+                      case .trailing:
+                        layoutToAttribute = .trailingMargin
+                      case .top:
+                        layoutToAttribute = .topMargin
+                      case .bottom:
+                        layoutToAttribute = .bottomMargin
+                      default:
+                        fatalError()
+                      }
+                    } else if self.from.attributes == .directionalMargins && self.to.attributes == .directionalEdges {
+                      switch layoutFromAttribute {
+                      case .leadingMargin:
+                        layoutToAttribute = .leading
+                      case .trailingMargin:
+                        layoutToAttribute = .trailing
+                      case .topMargin:
+                        layoutToAttribute = .top
+                      case .bottomMargin:
+                        layoutToAttribute = .bottom
+                      default:
+                        fatalError()
+                      }
                     } else if self.from.attributes == self.to.attributes {
                         layoutToAttribute = layoutFromAttribute
                     } else {
@@ -178,12 +215,12 @@ public final class Constraint {
 
     // MARK: Public
 
-    @available(*, deprecated:3.0, message:"Use activate().")
+    @available(*, deprecated, renamed:"activate()")
     public func install() {
         self.activate()
     }
 
-    @available(*, deprecated:3.0, message:"Use deactivate().")
+    @available(*, deprecated, renamed:"deactivate()")
     public func uninstall() {
         self.deactivate()
     }
@@ -208,31 +245,46 @@ public final class Constraint {
         return self
     }
 
+    #if os(iOS) || os(tvOS)
+    @discardableResult
+    @available(iOS 11.0, tvOS 11.0, *)
+    public func update(inset: ConstraintDirectionalInsetTarget) -> Constraint {
+      self.constant = inset.constraintDirectionalInsetTargetValue
+      return self
+    }
+    #endif
+
     @discardableResult
     public func update(priority: ConstraintPriorityTarget) -> Constraint {
         self.priority = priority.constraintPriorityTargetValue
         return self
     }
 
-    @available(*, deprecated:3.0, message:"Use update(offset: ConstraintOffsetTarget) instead.")
+    @discardableResult
+    public func update(priority: ConstraintPriority) -> Constraint {
+        self.priority = priority.value
+        return self
+    }
+
+    @available(*, deprecated, renamed:"update(offset:)")
     public func updateOffset(amount: ConstraintOffsetTarget) -> Void { self.update(offset: amount) }
 
-    @available(*, deprecated:3.0, message:"Use update(inset: ConstraintInsetTarget) instead.")
+    @available(*, deprecated, renamed:"update(inset:)")
     public func updateInsets(amount: ConstraintInsetTarget) -> Void { self.update(inset: amount) }
 
-    @available(*, deprecated:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, renamed:"update(priority:)")
     public func updatePriority(amount: ConstraintPriorityTarget) -> Void { self.update(priority: amount) }
 
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
     public func updatePriorityRequired() -> Void {}
 
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
     public func updatePriorityHigh() -> Void { fatalError("Must be implemented by Concrete subclass.") }
 
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
     public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
 
-    @available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
+    @available(*, deprecated, message:"Use update(priority: ConstraintPriorityTarget) instead.")
     public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
 
     // MARK: Internal

Source/ConstraintAttributes.swift → Sources/ConstraintAttributes.swift

@@ -28,7 +28,9 @@
 #endif
 
 
-internal struct ConstraintAttributes : OptionSet {
+internal struct ConstraintAttributes : OptionSet, ExpressibleByIntegerLiteral {
+    
+    typealias IntegerLiteralType = UInt
     
     internal init(rawValue: UInt) {
         self.rawValue = rawValue
@@ -39,10 +41,13 @@ internal struct ConstraintAttributes : OptionSet {
     internal init(nilLiteral: ()) {
         self.rawValue = 0
     }
+    internal init(integerLiteral rawValue: IntegerLiteralType) {
+        self.init(rawValue: rawValue)
+    }
     
     internal private(set) var rawValue: UInt
-    internal static var allZeros: ConstraintAttributes { return self.init(0) }
-    internal static func convertFromNilLiteral() -> ConstraintAttributes { return self.init(0) }
+    internal static var allZeros: ConstraintAttributes { return 0 }
+    internal static func convertFromNilLiteral() -> ConstraintAttributes { return 0 }
     internal var boolValue: Bool { return self.rawValue != 0 }
     
     internal func toRaw() -> UInt { return self.rawValue }
@@ -51,57 +56,65 @@ internal struct ConstraintAttributes : OptionSet {
     
     // normal
     
-    internal static var none: ConstraintAttributes { return self.init(0) }
-    internal static var left: ConstraintAttributes { return self.init(1) }
-    internal static var top: ConstraintAttributes {  return self.init(2) }
-    internal static var right: ConstraintAttributes { return self.init(4) }
-    internal static var bottom: ConstraintAttributes { return self.init(8) }
-    internal static var leading: ConstraintAttributes { return self.init(16) }
-    internal static var trailing: ConstraintAttributes { return self.init(32) }
-    internal static var width: ConstraintAttributes { return self.init(64) }
-    internal static var height: ConstraintAttributes { return self.init(128) }
-    internal static var centerX: ConstraintAttributes { return self.init(256) }
-    internal static var centerY: ConstraintAttributes { return self.init(512) }
-    internal static var lastBaseline: ConstraintAttributes { return self.init(1024) }
+    internal static let none: ConstraintAttributes = 0
+    internal static let left: ConstraintAttributes = ConstraintAttributes(UInt(1) << 0)
+    internal static let top: ConstraintAttributes = ConstraintAttributes(UInt(1) << 1)
+    internal static let right: ConstraintAttributes = ConstraintAttributes(UInt(1) << 2)
+    internal static let bottom: ConstraintAttributes = ConstraintAttributes(UInt(1) << 3)
+    internal static let leading: ConstraintAttributes = ConstraintAttributes(UInt(1) << 4)
+    internal static let trailing: ConstraintAttributes = ConstraintAttributes(UInt(1) << 5)
+    internal static let width: ConstraintAttributes = ConstraintAttributes(UInt(1) << 6)
+    internal static let height: ConstraintAttributes = ConstraintAttributes(UInt(1) << 7)
+    internal static let centerX: ConstraintAttributes = ConstraintAttributes(UInt(1) << 8)
+    internal static let centerY: ConstraintAttributes = ConstraintAttributes(UInt(1) << 9)
+    internal static let lastBaseline: ConstraintAttributes = ConstraintAttributes(UInt(1) << 10)
     
     @available(iOS 8.0, OSX 10.11, *)
-    internal static var firstBaseline: ConstraintAttributes { return self.init(2048) }
-    
+    internal static let firstBaseline: ConstraintAttributes = ConstraintAttributes(UInt(1) << 11)
+
     @available(iOS 8.0, *)
-    internal static var leftMargin: ConstraintAttributes { return self.init(4096) }
-    
+    internal static let leftMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 12)
+
     @available(iOS 8.0, *)
-    internal static var rightMargin: ConstraintAttributes { return self.init(8192) }
-    
+    internal static let rightMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 13)
+
     @available(iOS 8.0, *)
-    internal static var topMargin: ConstraintAttributes { return self.init(16384) }
-    
+    internal static let topMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 14)
+
     @available(iOS 8.0, *)
-    internal static var bottomMargin: ConstraintAttributes { return self.init(32768) }
-    
+    internal static let bottomMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 15)
+
     @available(iOS 8.0, *)
-    internal static var leadingMargin: ConstraintAttributes { return self.init(65536) }
-    
+    internal static let leadingMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 16)
+
     @available(iOS 8.0, *)
-    internal static var trailingMargin: ConstraintAttributes { return self.init(131072) }
-    
+    internal static let trailingMargin: ConstraintAttributes = ConstraintAttributes(UInt(1) << 17)
+
     @available(iOS 8.0, *)
-    internal static var centerXWithinMargins: ConstraintAttributes { return self.init(262144) }
-    
+    internal static let centerXWithinMargins: ConstraintAttributes = ConstraintAttributes(UInt(1) << 18)
+
     @available(iOS 8.0, *)
-    internal static var centerYWithinMargins: ConstraintAttributes { return self.init(524288) }
+    internal static let centerYWithinMargins: ConstraintAttributes = ConstraintAttributes(UInt(1) << 19)
     
     // aggregates
     
-    internal static var edges: ConstraintAttributes { return self.init(15) }
-    internal static var size: ConstraintAttributes { return self.init(192) }
-    internal static var center: ConstraintAttributes { return self.init(768) }
-    
+    internal static let edges: ConstraintAttributes = [.horizontalEdges, .verticalEdges]
+    internal static let horizontalEdges: ConstraintAttributes = [.left, .right]
+    internal static let verticalEdges: ConstraintAttributes = [.top, .bottom]
+    internal static let directionalEdges: ConstraintAttributes = [.directionalHorizontalEdges, .directionalVerticalEdges]
+    internal static let directionalHorizontalEdges: ConstraintAttributes = [.leading, .trailing]
+    internal static let directionalVerticalEdges: ConstraintAttributes = [.top, .bottom]
+    internal static let size: ConstraintAttributes = [.width, .height]
+    internal static let center: ConstraintAttributes = [.centerX, .centerY]
+
     @available(iOS 8.0, *)
-    internal static var margins: ConstraintAttributes { return self.init(61440) }
-    
+    internal static let margins: ConstraintAttributes = [.leftMargin, .topMargin, .rightMargin, .bottomMargin]
+
+    @available(iOS 8.0, *)
+    internal static let directionalMargins: ConstraintAttributes = [.leadingMargin, .topMargin, .trailingMargin, .bottomMargin]
+
     @available(iOS 8.0, *)
-    internal static var centerWithinMargins: ConstraintAttributes { return self.init(786432) }
+    internal static let centerWithinMargins: ConstraintAttributes = [.centerXWithinMargins, .centerYWithinMargins]
     
     internal var layoutAttributes:[LayoutAttribute] {
         var attrs = [LayoutAttribute]()

Source/ConstraintConstantTarget.swift → Sources/ConstraintConstantTarget.swift

@@ -40,6 +40,12 @@ extension CGSize: ConstraintConstantTarget {
 extension ConstraintInsets: ConstraintConstantTarget {
 }
 
+#if os(iOS) || os(tvOS)
+@available(iOS 11.0, tvOS 11.0, *)
+extension ConstraintDirectionalInsets: ConstraintConstantTarget {
+}
+#endif
+
 extension ConstraintConstantTarget {
     
     internal func constraintConstantTargetValueFor(layoutAttribute: LayoutAttribute) -> CGFloat {
@@ -82,7 +88,11 @@ extension ConstraintConstantTarget {
                     return value.y
                 case .width, .height, .notAnAttribute:
                     return 0.0
-                }
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
             #else
                 switch layoutAttribute {
                 case .left, .right, .leading, .trailing, .centerX:
@@ -91,56 +101,112 @@ extension ConstraintConstantTarget {
                     return value.y
                 case .width, .height, .notAnAttribute:
                     return 0.0
-                }
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
             #endif
         }
         
         if let value = self as? ConstraintInsets {
             #if os(iOS) || os(tvOS)
                 switch layoutAttribute {
-                case .left, .leftMargin, .centerX, .centerXWithinMargins:
+                case .left, .leftMargin:
                     return value.left
-                case .top, .topMargin, .centerY, .centerYWithinMargins, .lastBaseline, .firstBaseline:
+                case .top, .topMargin, .firstBaseline:
                     return value.top
                 case .right, .rightMargin:
                     return -value.right
-                case .bottom, .bottomMargin:
+                case .bottom, .bottomMargin, .lastBaseline:
                     return -value.bottom
                 case .leading, .leadingMargin:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
                 case .trailing, .trailingMargin:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
+                case .centerX, .centerXWithinMargins:
+                    return (value.left - value.right) / 2
+                case .centerY, .centerYWithinMargins:
+                    return (value.top - value.bottom) / 2
                 case .width:
                     return -(value.left + value.right)
                 case .height:
                     return -(value.top + value.bottom)
                 case .notAnAttribute:
                     return 0.0
-                }
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
             #else
                 switch layoutAttribute {
-                case .left, .centerX:
+                case .left:
                     return value.left
-                case .top, .centerY, .lastBaseline, .firstBaseline:
+                case .top, .firstBaseline:
                     return value.top
                 case .right:
                     return -value.right
-                case .bottom:
+                case .bottom, .lastBaseline:
                     return -value.bottom
                 case .leading:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.left : value.right
                 case .trailing:
                     return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.right : -value.left
+                case .centerX:
+                    return (value.left - value.right) / 2
+                case .centerY:
+                    return (value.top - value.bottom) / 2
                 case .width:
                     return -(value.left + value.right)
                 case .height:
                     return -(value.top + value.bottom)
                 case .notAnAttribute:
                     return 0.0
-                }
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #endif
+            }
             #endif
         }
         
+        #if os(iOS) || os(tvOS)
+            if #available(iOS 11.0, tvOS 11.0, *), let value = self as? ConstraintDirectionalInsets {
+                switch layoutAttribute {
+                case .left, .leftMargin:
+                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? value.leading : value.trailing
+                case .top, .topMargin, .firstBaseline:
+                    return value.top
+                case .right, .rightMargin:
+                  return (ConstraintConfig.interfaceLayoutDirection == .leftToRight) ? -value.trailing : -value.leading
+                case .bottom, .bottomMargin, .lastBaseline:
+                    return -value.bottom
+                case .leading, .leadingMargin:
+                    return value.leading
+                case .trailing, .trailingMargin:
+                    return -value.trailing
+                case .centerX, .centerXWithinMargins:
+                    return (value.leading - value.trailing) / 2
+                case .centerY, .centerYWithinMargins:
+                    return (value.top - value.bottom) / 2
+                case .width:
+                    return -(value.leading + value.trailing)
+                case .height:
+                    return -(value.top + value.bottom)
+                case .notAnAttribute:
+                    return 0.0
+                #if swift(>=5.0)
+                @unknown default:
+                    return 0.0
+                #else
+                default:
+                    return 0.0
+                #endif
+                }
+            }
+        #endif
+
         return 0.0
     }
     

Source/ConstraintDSL.swift → Sources/ConstraintDSL.swift

@@ -99,6 +99,26 @@ extension ConstraintBasicAttributesDSL {
         return ConstraintItem(target: self.target, attributes: ConstraintAttributes.edges)
     }
     
+    public var directionalEdges: ConstraintItem {
+      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalEdges)
+    }
+
+    public var horizontalEdges: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.horizontalEdges)
+    }
+
+    public var verticalEdges: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.verticalEdges)
+    }
+
+    public var directionalHorizontalEdges: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalHorizontalEdges)
+    }
+
+    public var directionalVerticalEdges: ConstraintItem {
+        return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalVerticalEdges)
+    }
+
     public var size: ConstraintItem {
         return ConstraintItem(target: self.target, attributes: ConstraintAttributes.size)
     }
@@ -114,8 +134,7 @@ public protocol ConstraintAttributesDSL : ConstraintBasicAttributesDSL {
 extension ConstraintAttributesDSL {
     
     // MARK: Baselines
-    
-    @available(*, deprecated:3.0, message:"Use .lastBaseline instead")
+    @available(*, deprecated, renamed:"lastBaseline")
     public var baseline: ConstraintItem {
         return ConstraintItem(target: self.target, attributes: ConstraintAttributes.lastBaseline)
     }
@@ -177,6 +196,11 @@ extension ConstraintAttributesDSL {
         return ConstraintItem(target: self.target, attributes: ConstraintAttributes.margins)
     }
     
+    @available(iOS 8.0, *)
+    public var directionalMargins: ConstraintItem {
+      return ConstraintItem(target: self.target, attributes: ConstraintAttributes.directionalMargins)
+    }
+
     @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintItem {
         return ConstraintItem(target: self.target, attributes: ConstraintAttributes.centerWithinMargins)

Sources/ConstraintDirectionalInsetTarget.swift

@@ -0,0 +1,49 @@
+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+import UIKit
+#else
+import AppKit
+#endif
+
+#if os(iOS) || os(tvOS)
+public protocol ConstraintDirectionalInsetTarget: ConstraintConstantTarget {
+}
+
+@available(iOS 11.0, tvOS 11.0, *)
+extension ConstraintDirectionalInsets: ConstraintDirectionalInsetTarget {
+}
+
+extension ConstraintDirectionalInsetTarget {
+
+  @available(iOS 11.0, tvOS 11.0, *)
+  internal var constraintDirectionalInsetTargetValue: ConstraintDirectionalInsets {
+    if let amount = self as? ConstraintDirectionalInsets {
+      return amount
+    } else {
+      return ConstraintDirectionalInsets(top: 0, leading: 0, bottom: 0, trailing: 0)
+    }
+  }
+}
+#endif

Source/SnapKit.h → Sources/ConstraintDirectionalInsets.swift

@@ -21,7 +21,14 @@
 //  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 //  THE SOFTWARE.
 
-#import <Foundation/Foundation.h>
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
 
-FOUNDATION_EXPORT double SnapKitVersionNumber;
-FOUNDATION_EXPORT const unsigned char SnapKitVersionString[];
+
+#if os(iOS) || os(tvOS)
+    @available(iOS 11.0, tvOS 11.0, *)
+    public typealias ConstraintDirectionalInsets = NSDirectionalEdgeInsets
+#endif

Source/ConstraintLayoutGuide+Extensions.swift → Sources/ConstraintLayoutGuide+Extensions.swift

@@ -29,7 +29,7 @@
 @available(iOS 9.0, OSX 10.11, *)
 public extension ConstraintLayoutGuide {
     
-    public var snp: ConstraintLayoutGuideDSL {
+    var snp: ConstraintLayoutGuideDSL {
         return ConstraintLayoutGuideDSL(guide: self)
     }
     

Source/ConstraintMaker.swift → Sources/ConstraintMaker.swift

@@ -69,7 +69,7 @@ public class ConstraintMaker {
         return self.makeExtendableWithAttributes(.centerY)
     }
     
-    @available(*, deprecated:3.0, message:"Use lastBaseline instead")
+    @available(*, deprecated, renamed:"lastBaseline")
     public var baseline: ConstraintMakerExtendable {
         return self.makeExtendableWithAttributes(.lastBaseline)
     }
@@ -126,6 +126,21 @@ public class ConstraintMaker {
     public var edges: ConstraintMakerExtendable {
         return self.makeExtendableWithAttributes(.edges)
     }
+    public var horizontalEdges: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.horizontalEdges)
+    }
+    public var verticalEdges: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.verticalEdges)
+    }
+    public var directionalEdges: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.directionalEdges)
+    }
+    public var directionalHorizontalEdges: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.directionalHorizontalEdges)
+    }
+    public var directionalVerticalEdges: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.directionalVerticalEdges)
+    }
     public var size: ConstraintMakerExtendable {
         return self.makeExtendableWithAttributes(.size)
     }
@@ -138,12 +153,17 @@ public class ConstraintMaker {
         return self.makeExtendableWithAttributes(.margins)
     }
     
+    @available(iOS 8.0, *)
+    public var directionalMargins: ConstraintMakerExtendable {
+        return self.makeExtendableWithAttributes(.directionalMargins)
+    }
+
     @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintMakerExtendable {
         return self.makeExtendableWithAttributes(.centerWithinMargins)
     }
     
-    private let item: LayoutConstraintItem
+    public let item: LayoutConstraintItem
     private var descriptions = [ConstraintDescription]()
     
     internal init(item: LayoutConstraintItem) {
@@ -171,15 +191,7 @@ public class ConstraintMaker {
     }
     
     internal static func makeConstraints(item: LayoutConstraintItem, closure: (_ make: ConstraintMaker) -> Void) {
-        let maker = ConstraintMaker(item: item)
-        closure(maker)
-        var constraints: [Constraint] = []
-        for description in maker.descriptions {
-            guard let constraint = description.constraint else {
-                continue
-            }
-            constraints.append(constraint)
-        }
+        let constraints = prepareConstraints(item: item, closure: closure)
         for constraint in constraints {
             constraint.activateIfNeeded(updatingExisting: false)
         }
@@ -196,15 +208,7 @@ public class ConstraintMaker {
             return
         }
         
-        let maker = ConstraintMaker(item: item)
-        closure(maker)
-        var constraints: [Constraint] = []
-        for description in maker.descriptions {
-            guard let constraint = description.constraint else {
-                continue
-            }
-            constraints.append(constraint)
-        }
+        let constraints = prepareConstraints(item: item, closure: closure)
         for constraint in constraints {
             constraint.activateIfNeeded(updatingExisting: true)
         }

Source/ConstraintMakerEditable.swift → Sources/ConstraintMakerEditable.swift

@@ -28,7 +28,7 @@
 #endif
 
 
-public class ConstraintMakerEditable: ConstraintMakerPriortizable {
+public class ConstraintMakerEditable: ConstraintMakerPrioritizable {
 
     @discardableResult
     public func multipliedBy(_ amount: ConstraintMultiplierTarget) -> ConstraintMakerEditable {
@@ -53,4 +53,12 @@ public class ConstraintMakerEditable: ConstraintMakerPriortizable {
         return self
     }
     
+    #if os(iOS) || os(tvOS)
+    @discardableResult
+    @available(iOS 11.0, tvOS 11.0, *)
+    public func inset(_ amount: ConstraintDirectionalInsetTarget) -> ConstraintMakerEditable {
+        self.description.constant = amount.constraintDirectionalInsetTargetValue
+        return self
+    }
+    #endif
 }

Source/ConstraintMakerExtendable.swift → Sources/ConstraintMakerExtendable.swift

@@ -80,7 +80,7 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
         return self
     }
     
-    @available(*, deprecated:3.0, message:"Use lastBaseline instead")
+    @available(*, deprecated, renamed:"lastBaseline")
     public var baseline: ConstraintMakerExtendable {
         self.description.attributes += .lastBaseline
         return self
@@ -149,6 +149,26 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
         self.description.attributes += .edges
         return self
     }
+    public var horizontalEdges: ConstraintMakerExtendable {
+        self.description.attributes += .horizontalEdges
+        return self
+    }
+    public var verticalEdges: ConstraintMakerExtendable {
+        self.description.attributes += .verticalEdges
+        return self
+    }
+    public var directionalEdges: ConstraintMakerExtendable {
+        self.description.attributes += .directionalEdges
+        return self
+    }
+    public var directionalHorizontalEdges: ConstraintMakerExtendable {
+        self.description.attributes += .directionalHorizontalEdges
+        return self
+    }
+    public var directionalVerticalEdges: ConstraintMakerExtendable {
+        self.description.attributes += .directionalVerticalEdges
+        return self
+    }
     public var size: ConstraintMakerExtendable {
         self.description.attributes += .size
         return self
@@ -160,6 +180,12 @@ public class ConstraintMakerExtendable: ConstraintMakerRelatable {
         return self
     }
     
+    @available(iOS 8.0, *)
+    public var directionalMargins: ConstraintMakerExtendable {
+      self.description.attributes += .directionalMargins
+      return self
+    }
+
     @available(iOS 8.0, *)
     public var centerWithinMargins: ConstraintMakerExtendable {
         self.description.attributes += .centerWithinMargins

Source/ConstraintMakerPriortizable.swift → Sources/ConstraintMakerPrioritizable.swift

@@ -27,8 +27,10 @@
     import AppKit
 #endif
 
+@available(*, deprecated, message:"Use ConstraintMakerPrioritizable instead.")
+public typealias ConstraintMakerPriortizable = ConstraintMakerPrioritizable
 
-public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
+public class ConstraintMakerPrioritizable: ConstraintMakerFinalizable {
     
     @discardableResult
     public func priority(_ amount: ConstraintPriority) -> ConstraintMakerFinalizable {
@@ -42,25 +44,25 @@ public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
         return self
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(.required) instead.")
+    @available(*, deprecated, message:"Use priority(.required) instead.")
     @discardableResult
     public func priorityRequired() -> ConstraintMakerFinalizable {
         return self.priority(.required)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(.high) instead.")
+    @available(*, deprecated, message:"Use priority(.high) instead.")
     @discardableResult
     public func priorityHigh() -> ConstraintMakerFinalizable {
         return self.priority(.high)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(.medium) instead.")
+    @available(*, deprecated, message:"Use priority(.medium) instead.")
     @discardableResult
     public func priorityMedium() -> ConstraintMakerFinalizable {
         return self.priority(.medium)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(.low) instead.")
+    @available(*, deprecated, message:"Use priority(.low) instead.")
     @discardableResult
     public func priorityLow() -> ConstraintMakerFinalizable {
         return self.priority(.low)

Sources/ConstraintMakerRelatable+Extensions.swift

@@ -0,0 +1,57 @@
+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+extension ConstraintMakerRelatable {
+  
+    @discardableResult
+    public func equalToSuperview<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
+        guard let other = self.description.item.superview else {
+            fatalError("Expected superview but found nil when attempting make constraint `equalToSuperview`.")
+        }
+        return self.relatedTo(closure(other), relation: .equal, file: file, line: line)
+    }
+  
+    @discardableResult
+    public func lessThanOrEqualToSuperview<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
+        guard let other = self.description.item.superview else {
+            fatalError("Expected superview but found nil when attempting make constraint `lessThanOrEqualToSuperview`.")
+        }
+        return self.relatedTo(closure(other), relation: .lessThanOrEqual, file: file, line: line)
+    }
+  
+    @discardableResult
+    public func greaterThanOrEqualTo<T: ConstraintRelatableTarget>(_ closure: (ConstraintView) -> T, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
+        guard let other = self.description.item.superview else {
+            fatalError("Expected superview but found nil when attempting make constraint `greaterThanOrEqualToSuperview`.")
+        }
+        return self.relatedTo(closure(other), relation: .greaterThanOrEqual, file: file, line: line)
+    }
+  
+}

Source/ConstraintMakerRelatable.swift → Sources/ConstraintMakerRelatable.swift

@@ -45,7 +45,9 @@ public class ConstraintMakerRelatable {
                   other.attributes.layoutAttributes.count <= 1 ||
                   other.attributes.layoutAttributes == self.description.attributes.layoutAttributes ||
                   other.attributes == .edges && self.description.attributes == .margins ||
-                  other.attributes == .margins && self.description.attributes == .edges else {
+                  other.attributes == .margins && self.description.attributes == .edges ||
+                  other.attributes == .directionalEdges && self.description.attributes == .directionalMargins ||
+                  other.attributes == .directionalMargins && self.description.attributes == .directionalEdges else {
                 fatalError("Cannot constraint to multiple non identical attributes. (\(file), \(line))");
             }
             

Source/ConstraintPriorityTarget.swift → Sources/ConstraintPriorityTarget.swift

@@ -73,3 +73,13 @@ extension CGFloat: ConstraintPriorityTarget {
     }
     
 }
+
+#if os(iOS) || os(tvOS)
+extension UILayoutPriority: ConstraintPriorityTarget {
+
+    public var constraintPriorityTargetValue: Float {
+        return self.rawValue
+    }
+
+}
+#endif

Source/ConstraintRelatableTarget.swift → Sources/ConstraintRelatableTarget.swift

@@ -55,6 +55,12 @@ extension CGPoint: ConstraintRelatableTarget {
 extension ConstraintInsets: ConstraintRelatableTarget {
 }
 
+#if os(iOS) || os(tvOS)
+@available(iOS 11.0, tvOS 11.0, *)
+extension ConstraintDirectionalInsets: ConstraintRelatableTarget {
+}
+#endif
+
 extension ConstraintItem: ConstraintRelatableTarget {
 }
 

Sources/ConstraintView+Extensions.swift

@@ -0,0 +1,152 @@
+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public extension ConstraintView {
+    
+    @available(*, deprecated, renamed:"snp.left")
+    var snp_left: ConstraintItem { return self.snp.left }
+    
+    @available(*, deprecated, renamed:"snp.top")
+    var snp_top: ConstraintItem { return self.snp.top }
+    
+    @available(*, deprecated, renamed:"snp.right")
+    var snp_right: ConstraintItem { return self.snp.right }
+    
+    @available(*, deprecated, renamed:"snp.bottom")
+    var snp_bottom: ConstraintItem { return self.snp.bottom }
+    
+    @available(*, deprecated, renamed:"snp.leading")
+    var snp_leading: ConstraintItem { return self.snp.leading }
+    
+    @available(*, deprecated, renamed:"snp.trailing")
+    var snp_trailing: ConstraintItem { return self.snp.trailing }
+    
+    @available(*, deprecated, renamed:"snp.width")
+    var snp_width: ConstraintItem { return self.snp.width }
+    
+    @available(*, deprecated, renamed:"snp.height")
+    var snp_height: ConstraintItem { return self.snp.height }
+    
+    @available(*, deprecated, renamed:"snp.centerX")
+    var snp_centerX: ConstraintItem { return self.snp.centerX }
+    
+    @available(*, deprecated, renamed:"snp.centerY")
+    var snp_centerY: ConstraintItem { return self.snp.centerY }
+    
+    @available(*, deprecated, renamed:"snp.baseline")
+    var snp_baseline: ConstraintItem { return self.snp.baseline }
+    
+    @available(*, deprecated, renamed:"snp.lastBaseline")
+    @available(iOS 8.0, OSX 10.11, *)
+    var snp_lastBaseline: ConstraintItem { return self.snp.lastBaseline }
+    
+    @available(iOS, deprecated, renamed:"snp.firstBaseline")
+    @available(iOS 8.0, OSX 10.11, *)
+    var snp_firstBaseline: ConstraintItem { return self.snp.firstBaseline }
+    
+    @available(iOS, deprecated, renamed:"snp.leftMargin")
+    @available(iOS 8.0, *)
+    var snp_leftMargin: ConstraintItem { return self.snp.leftMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.topMargin")
+    @available(iOS 8.0, *)
+    var snp_topMargin: ConstraintItem { return self.snp.topMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.rightMargin")
+    @available(iOS 8.0, *)
+    var snp_rightMargin: ConstraintItem { return self.snp.rightMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.bottomMargin")
+    @available(iOS 8.0, *)
+    var snp_bottomMargin: ConstraintItem { return self.snp.bottomMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.leadingMargin")
+    @available(iOS 8.0, *)
+    var snp_leadingMargin: ConstraintItem { return self.snp.leadingMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.trailingMargin")
+    @available(iOS 8.0, *)
+    var snp_trailingMargin: ConstraintItem { return self.snp.trailingMargin }
+    
+    @available(iOS, deprecated, renamed:"snp.centerXWithinMargins")
+    @available(iOS 8.0, *)
+    var snp_centerXWithinMargins: ConstraintItem { return self.snp.centerXWithinMargins }
+    
+    @available(iOS, deprecated, renamed:"snp.centerYWithinMargins")
+    @available(iOS 8.0, *)
+    var snp_centerYWithinMargins: ConstraintItem { return self.snp.centerYWithinMargins }
+    
+    @available(*, deprecated, renamed:"snp.edges")
+    var snp_edges: ConstraintItem { return self.snp.edges }
+    
+    @available(*, deprecated, renamed:"snp.size")
+    var snp_size: ConstraintItem { return self.snp.size }
+    
+    @available(*, deprecated, renamed:"snp.center")
+    var snp_center: ConstraintItem { return self.snp.center }
+    
+    @available(iOS, deprecated, renamed:"snp.margins")
+    @available(iOS 8.0, *)
+    var snp_margins: ConstraintItem { return self.snp.margins }
+    
+    @available(iOS, deprecated, renamed:"snp.centerWithinMargins")
+    @available(iOS 8.0, *)
+    var snp_centerWithinMargins: ConstraintItem { return self.snp.centerWithinMargins }
+    
+    @available(*, deprecated, renamed:"snp.prepareConstraints(_:)")
+    func snp_prepareConstraints(_ closure: (_ make: ConstraintMaker) -> Void) -> [Constraint] {
+        return self.snp.prepareConstraints(closure)
+    }
+    
+    @available(*, deprecated, renamed:"snp.makeConstraints(_:)")
+    func snp_makeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
+        self.snp.makeConstraints(closure)
+    }
+    
+    @available(*, deprecated, renamed:"snp.remakeConstraints(_:)")
+    func snp_remakeConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
+        self.snp.remakeConstraints(closure)
+    }
+    
+    @available(*, deprecated, renamed:"snp.updateConstraints(_:)")
+    func snp_updateConstraints(_ closure: (_ make: ConstraintMaker) -> Void) {
+        self.snp.updateConstraints(closure)
+    }
+    
+    @available(*, deprecated, renamed:"snp.removeConstraints()")
+    func snp_removeConstraints() {
+        self.snp.removeConstraints()
+    }
+    
+    var snp: ConstraintViewDSL {
+        return ConstraintViewDSL(view: self)
+    }
+    
+}

Source/ConstraintViewDSL.swift → Sources/ConstraintViewDSL.swift

@@ -55,7 +55,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
         get {
             return self.view.contentHuggingPriority(for: .horizontal).rawValue
         }
-        set {
+        nonmutating set {
             self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .horizontal)
         }
     }
@@ -64,7 +64,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
         get {
             return self.view.contentHuggingPriority(for: .vertical).rawValue
         }
-        set {
+        nonmutating set {
             self.view.setContentHuggingPriority(LayoutPriority(rawValue: newValue), for: .vertical)
         }
     }
@@ -73,7 +73,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
         get {
             return self.view.contentCompressionResistancePriority(for: .horizontal).rawValue
         }
-        set {
+        nonmutating set {
             self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .horizontal)
         }
     }
@@ -82,7 +82,7 @@ public struct ConstraintViewDSL: ConstraintAttributesDSL {
         get {
             return self.view.contentCompressionResistancePriority(for: .vertical).rawValue
         }
-        set {
+        nonmutating set {
             self.view.setContentCompressionResistancePriority(LayoutPriority(rawValue: newValue), for: .vertical)
         }
     }

Source/Debugging.swift → Sources/Debugging.swift

@@ -29,7 +29,7 @@
 
 public extension LayoutConstraint {
     
-    override public var description: String {
+    override var description: String {
         var description = "<"
         
         description += descriptionForObject(self)
@@ -82,6 +82,9 @@ private func descriptionForRelation(_ relation: LayoutRelation) -> String {
     case .equal:                return "=="
     case .greaterThanOrEqual:   return ">="
     case .lessThanOrEqual:      return "<="
+    #if swift(>=5.0)
+    @unknown default:           return "unknown"
+    #endif
     }
 }
 
@@ -109,7 +112,10 @@ private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
         case .trailingMargin:       return "trailingMargin"
         case .centerXWithinMargins: return "centerXWithinMargins"
         case .centerYWithinMargins: return "centerYWithinMargins"
-        }
+        #if swift(>=5.0)
+        @unknown default:           return "unknown"
+        #endif
+    }
     #else
         switch attribute {
         case .notAnAttribute:       return "notAnAttribute"
@@ -125,7 +131,10 @@ private func descriptionForAttribute(_ attribute: LayoutAttribute) -> String {
         case .centerY:              return "centerY"
         case .lastBaseline:         return "lastBaseline"
         case .firstBaseline:        return "firstBaseline"
-        }
+        #if swift(>=5.0)
+        @unknown default:           return "unknown"
+        #endif
+    }
     #endif
 }
 

Source/LayoutConstraint.swift → Sources/LayoutConstraint.swift

@@ -44,13 +44,17 @@ public class LayoutConstraint : NSLayoutConstraint {
 }
 
 internal func ==(lhs: LayoutConstraint, rhs: LayoutConstraint) -> Bool {
-    guard lhs.firstItem === rhs.firstItem &&
-          lhs.secondItem === rhs.secondItem &&
-          lhs.firstAttribute == rhs.firstAttribute &&
+    // If firstItem or secondItem on either constraint has a dangling pointer
+    // this comparison can cause a crash. The solution for this is to ensure
+    // your layout code hold strong references to things like Views, LayoutGuides
+    // and LayoutAnchors as SnapKit will not keep strong references to any of these.
+    guard lhs.firstAttribute == rhs.firstAttribute &&
           lhs.secondAttribute == rhs.secondAttribute &&
           lhs.relation == rhs.relation &&
           lhs.priority == rhs.priority &&
-          lhs.multiplier == rhs.multiplier else {
+          lhs.multiplier == rhs.multiplier &&
+          lhs.secondItem === rhs.secondItem &&
+          lhs.firstItem === rhs.firstItem else {
         return false
     }
     return true

Source/LayoutConstraintItem.swift → Sources/LayoutConstraintItem.swift

@@ -28,7 +28,7 @@
 #endif
 
 
-public protocol LayoutConstraintItem: class {
+public protocol LayoutConstraintItem: AnyObject {
 }
 
 @available(iOS 9.0, OSX 10.11, *)

Source/Typealiases.swift → Sources/Typealiases.swift

@@ -25,8 +25,13 @@ import Foundation
 
 #if os(iOS) || os(tvOS)
     import UIKit
+#if swift(>=4.2)
+    typealias LayoutRelation = NSLayoutConstraint.Relation
+    typealias LayoutAttribute = NSLayoutConstraint.Attribute
+#else
     typealias LayoutRelation = NSLayoutRelation
     typealias LayoutAttribute = NSLayoutAttribute
+#endif
     typealias LayoutPriority = UILayoutPriority
 #else
     import AppKit

Source/UILayoutSupport+Extensions.swift → Sources/UILayoutSupport+Extensions.swift

@@ -29,7 +29,7 @@
 @available(iOS 8.0, *)
 public extension ConstraintLayoutSupport {
     
-    public var snp: ConstraintLayoutSupportDSL {
+    var snp: ConstraintLayoutSupportDSL {
         return ConstraintLayoutSupportDSL(support: self)
     }
     

Tests/Tests.swift → Tests/SnapKitTests/Tests.swift

@@ -59,6 +59,46 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(self.container.snp_constraints.count, 6, "Should have 6 constraints installed")
         
     }
+
+    func testHorizontalVerticalEdges() {
+        let v1 = View()
+        self.container.addSubview(v1)
+
+        v1.snp.makeConstraints { (make) -> Void in
+            make.verticalEdges.equalToSuperview()
+            make.horizontalEdges.equalToSuperview()
+            return
+        }
+
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints installed")
+
+        XCTAssertTrue(container.constraints.count == 4)
+        XCTAssertTrue(container.constraints.allSatisfy { $0.firstItem === v1 && $0.secondItem === v1.superview })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .left && $0.secondAttribute == .left })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .right && $0.secondAttribute == .right })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .top && $0.secondAttribute == .top })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .bottom && $0.secondAttribute == .bottom })
+    }
+
+    func testHorizontalVerticalDirectionalEdges() {
+        let v1 = View()
+        self.container.addSubview(v1)
+
+        v1.snp.makeConstraints { (make) -> Void in
+            make.directionalVerticalEdges.equalToSuperview()
+            make.directionalHorizontalEdges.equalToSuperview()
+            return
+        }
+
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints installed")
+
+        XCTAssertTrue(container.constraints.count == 4)
+        XCTAssertTrue(container.constraints.allSatisfy { $0.firstItem === v1 && $0.secondItem === v1.superview })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .leading && $0.secondAttribute == .leading })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .trailing && $0.secondAttribute == .trailing })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .top && $0.secondAttribute == .top })
+        XCTAssertNotNil(container.constraints.first { $0.firstAttribute == .bottom && $0.secondAttribute == .bottom })
+    }
     
     func testGuideMakeConstraints() {
         guard #available(iOS 9.0, OSX 10.11, *) else { return }
@@ -264,6 +304,40 @@ class SnapKitTests: XCTestCase {
         
     }
     
+    func testSetIsActivatedConstraints() {
+        let v1 = View()
+        let v2 = View()
+        self.container.addSubview(v1)
+        self.container.addSubview(v2)
+        
+        var c1: Constraint? = nil
+        var c2: Constraint? = nil
+        
+        v1.snp.prepareConstraints { (make) -> Void in
+            c1 = make.top.equalTo(v2.snp.top).offset(50).constraint
+            c2 = make.left.equalTo(v2.snp.top).offset(50).constraint
+            return
+        }
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 0, "Should have 0 constraints")
+        
+        c1?.isActive = true
+        c2?.isActive = false
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 1, "Should have 1 constraint")
+        
+        c1?.isActive = true
+        c2?.isActive = true
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 2, "Should have 2 constraints")
+        
+        c1?.isActive = false
+        c2?.isActive = false
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 0, "Should have 0 constraints")
+        
+    }
+    
     func testEdgeConstraints() {
         let view = View()
         self.container.addSubview(view)
@@ -379,6 +453,90 @@ class SnapKitTests: XCTestCase {
         XCTAssertEqual(constraints[3].constant, -25, "Should be -25")
     }
     
+    #if os(iOS) || os(tvOS)
+    @available(iOS 11.0, tvOS 11.0, *)
+    func testConstraintDirectionalInsetsAsImpliedEqualToConstraints() {
+        let view = View()
+        self.container.addSubview(view)
+
+        view.snp.makeConstraints { (make) -> Void in
+            make.top.leading.bottom.trailing.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
+        }
+
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+
+
+        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
+
+        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
+          XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
+          XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
+          XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
+        }
+
+        verify(constraints[0], .top, 25)
+        verify(constraints[1], .bottom, -25)
+        verify(constraints[2], .leading, 25)
+        verify(constraints[3], .trailing, -25)
+    }
+    #endif
+
+    #if os(iOS) || os(tvOS)
+    @available(iOS 11.0, tvOS 11.0, *)
+    func testConstraintDirectionalInsetsAsConstraintsConstant() {
+        let view = View()
+        self.container.addSubview(view)
+
+        view.snp.makeConstraints { (make) -> Void in
+            make.top.leading.bottom.trailing.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
+        }
+
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+
+
+        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
+
+        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
+            XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
+            XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
+            XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
+        }
+
+        verify(constraints[0], .top, 25)
+        verify(constraints[1], .bottom, -25)
+        verify(constraints[2], .leading, 25)
+        verify(constraints[3], .trailing, -25)
+    }
+    #endif
+
+    #if os(iOS) || os(tvOS)
+    @available(iOS 11.0, tvOS 11.0, *)
+    func testConstraintDirectionalInsetsFallBackForNonDirectionalConstraints() {
+        let view = View()
+        self.container.addSubview(view)
+
+        view.snp.makeConstraints { (make) -> Void in
+            make.edges.equalTo(self.container).inset(ConstraintDirectionalInsets(top: 25, leading: 25, bottom: 25, trailing: 25))
+        }
+
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+
+
+        let constraints = (self.container.snp_constraints as! [NSLayoutConstraint]).sorted { $0.firstAttribute.rawValue < $1.firstAttribute.rawValue }
+
+        let verify: (NSLayoutConstraint, NSLayoutConstraint.Attribute, CGFloat) -> Void = { constraint, attribute, constant in
+            XCTAssertEqual(constraint.firstAttribute, attribute, "First attribute \(constraint.firstAttribute.rawValue) is not \(attribute.rawValue)")
+            XCTAssertEqual(constraint.secondAttribute, attribute, "Second attribute \(constraint.secondAttribute.rawValue) is not \(attribute.rawValue)")
+            XCTAssertEqual(constraint.constant, constant, "Attribute \(attribute.rawValue) should have constant \(constant)")
+        }
+
+        verify(constraints[0], .left, 25)
+        verify(constraints[1], .right, -25)
+        verify(constraints[2], .top, 25)
+        verify(constraints[3], .bottom, -25)
+    }
+    #endif
+
     func testSizeConstraints() {
         let view = View()
         self.container.addSubview(view)
@@ -457,11 +615,33 @@ class SnapKitTests: XCTestCase {
         XCTAssert(fromAttributes == [.top, .left, .bottom, .right])
         XCTAssert(toAttributes == [.top, .left, .bottom, .right])
     }
+
+    func testDirectionalEdgesToDirectionalEdges() {
+        var fromAttributes = Set<LayoutAttribute>()
+        var toAttributes = Set<LayoutAttribute>()
+        
+        let view = View()
+        self.container.addSubview(view)
+        
+        view.snp.remakeConstraints { (make) -> Void in
+            make.directionalEdges.equalTo(self.container.snp.directionalEdges)
+        }
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+        
+        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
+            fromAttributes.insert(constraint.firstAttribute)
+            toAttributes.insert(constraint.secondAttribute)
+        }
+        
+        XCTAssert(fromAttributes == [.top, .leading, .bottom, .trailing])
+        XCTAssert(toAttributes == [.top, .leading, .bottom, .trailing])
+    }
     
     #if os(iOS) || os(tvOS)
     func testEdgesToMargins() {
-        var fromAttributes = Set<NSLayoutAttribute>()
-        var toAttributes = Set<NSLayoutAttribute>()
+        var fromAttributes = Set<LayoutAttribute>()
+        var toAttributes = Set<LayoutAttribute>()
         
         let view = View()
         self.container.addSubview(view)
@@ -498,6 +678,46 @@ class SnapKitTests: XCTestCase {
         XCTAssert(fromAttributes == [.topMargin, .leftMargin, .bottomMargin, .rightMargin])
         
     }
+
+    func testDirectionalEdgesToDirectionalMargins() {
+        var fromAttributes = Set<LayoutAttribute>()
+        var toAttributes = Set<LayoutAttribute>()
+        
+        let view = View()
+        self.container.addSubview(view)
+        
+        view.snp.remakeConstraints { (make) -> Void in
+            make.directionalEdges.equalTo(self.container.snp.directionalMargins)
+        }
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+        
+        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
+            fromAttributes.insert(constraint.firstAttribute)
+            toAttributes.insert(constraint.secondAttribute)
+        }
+        
+        XCTAssert(fromAttributes == [.top, .leading, .bottom, .trailing])
+        XCTAssert(toAttributes == [.topMargin, .leadingMargin, .bottomMargin, .trailingMargin])
+        
+        fromAttributes.removeAll()
+        toAttributes.removeAll()
+        
+        view.snp.remakeConstraints { (make) -> Void in
+            make.directionalMargins.equalTo(self.container.snp.directionalEdges)
+        }
+        
+        XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
+        
+        for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
+            fromAttributes.insert(constraint.firstAttribute)
+            toAttributes.insert(constraint.secondAttribute)
+        }
+        
+        XCTAssert(toAttributes == [.top, .leading, .bottom, .trailing])
+        XCTAssert(fromAttributes == [.topMargin, .leadingMargin, .bottomMargin, .trailingMargin])
+        
+    }
     
     func testLayoutGuideConstraints() {
         let vc = UIViewController()
@@ -516,6 +736,8 @@ class SnapKitTests: XCTestCase {
     
     func testCanSetLabel() {
         self.container.snp.setLabel("Hello World")
+
+        XCTAssertEqual(self.container.snp.label(), "Hello World")
     }
     
     func testPriorityShortcuts() {