Move the SD_CHECK_CGIMAGE_RETAIN_SOURCE assertion to SDWebImage Demo and Tests only

This does not effects user who use this framework, only useful for ourselves to ensure Apple does not break our code

Examples/SDWebImage Demo.xcodeproj/project.pbxproj

@@ -173,9 +173,8 @@
 		53761299155AB74D005750A4 /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
 		5376129B155AB74D005750A4 /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = System/Library/Frameworks/Foundation.framework; sourceTree = SDKROOT; };
 		5376129D155AB74D005750A4 /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = System/Library/Frameworks/CoreGraphics.framework; sourceTree = SDKROOT; };
-		537612A1155AB74D005750A4 /* SDWebImage Demo-Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "SDWebImage Demo-Info.plist"; sourceTree = "<group>"; };
+		537612A1155AB74D005750A4 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		537612A5155AB74D005750A4 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
-		537612A7155AB74D005750A4 /* SDWebImage Demo-Prefix.pch */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "SDWebImage Demo-Prefix.pch"; sourceTree = "<group>"; };
 		537612A8155AB74D005750A4 /* AppDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AppDelegate.h; sourceTree = "<group>"; };
 		537612A9155AB74D005750A4 /* AppDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = AppDelegate.m; sourceTree = "<group>"; };
 		537612AB155AB74D005750A4 /* MasterViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MasterViewController.h; sourceTree = "<group>"; };
@@ -393,9 +392,8 @@
 		537612A0155AB74D005750A4 /* Supporting Files */ = {
 			isa = PBXGroup;
 			children = (
-				537612A1155AB74D005750A4 /* SDWebImage Demo-Info.plist */,
+				537612A1155AB74D005750A4 /* Info.plist */,
 				537612A5155AB74D005750A4 /* main.m */,
-				537612A7155AB74D005750A4 /* SDWebImage Demo-Prefix.pch */,
 			);
 			name = "Supporting Files";
 			sourceTree = "<group>";
@@ -1031,8 +1029,7 @@
 			baseConfigurationReference = 789EDF4244C66933FDF3E181 /* Pods-SDWebImage iOS Demo.debug.xcconfig */;
 			buildSettings = {
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
-				GCC_PREFIX_HEADER = "SDWebImage Demo/SDWebImage Demo-Prefix.pch";
-				INFOPLIST_FILE = "SDWebImage Demo/SDWebImage Demo-Info.plist";
+				INFOPLIST_FILE = "SDWebImage Demo/Info.plist";
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -1044,8 +1041,7 @@
 			baseConfigurationReference = 0829378FA7103DD8649CCCF3 /* Pods-SDWebImage iOS Demo.release.xcconfig */;
 			buildSettings = {
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
-				GCC_PREFIX_HEADER = "SDWebImage Demo/SDWebImage Demo-Prefix.pch";
-				INFOPLIST_FILE = "SDWebImage Demo/SDWebImage Demo-Info.plist";
+				INFOPLIST_FILE = "SDWebImage Demo/Info.plist";
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = "iphonesimulator iphoneos";
 				TARGETED_DEVICE_FAMILY = "1,2";

Examples/SDWebImage Demo/SDWebImage Demo-Prefix.pch

@@ -1,10 +0,0 @@
-//
-// Prefix header for all source files of the 'SDWebImage Demo' target in the 'SDWebImage Demo' project
-//
-
-#import <Availability.h>
-
-#ifdef __OBJC__
-    #import <UIKit/UIKit.h>
-    #import <Foundation/Foundation.h>
-#endif

Podfile

@@ -64,3 +64,20 @@ target 'Tests TV' do
   platform :tvos, '9.0'
   all_test_pods
 end
+
+# Inject macro during SDWebImage Demo and Tests
+post_install do |installer_representation|
+  installer_representation.generated_pod_targets.each do |target|
+    if target.pod_name == "SDWebImage"
+      build_settings = target.build_settings
+      build_settings.each do |configuration, build_setting|
+        if configuration == :debug
+          config = build_setting.xcconfig
+          old_value = config.attributes['GCC_PREPROCESSOR_DEFINITIONS']
+          config.attributes['GCC_PREPROCESSOR_DEFINITIONS'] = old_value + ' SD_CHECK_CGIMAGE_RETAIN_SOURCE=1'
+          config.save_as(target.xcconfig_path(configuration))
+        end
+      end
+    end
+  end
+end

SDWebImage/Core/SDImageIOAnimatedCoder.m

@@ -18,14 +18,16 @@
 #import <ImageIO/ImageIO.h>
 #import <CoreServices/CoreServices.h>
 
+#if SD_CHECK_CGIMAGE_RETAIN_SOURCE
+#import <dlfcn.h>
+
+// SPI to check thread safe during Example and Test
+static CGImageSourceRef (*SDCGImageGetImageSource)(CGImageRef);
+#endif
+
 // Specify File Size for lossy format encoding, like JPEG
 static NSString * kSDCGImageDestinationRequestedFileSize = @"kCGImageDestinationRequestedFileSize";
 
-// Only assert on Debug mode
-#define SD_CHECK_CGIMAGE_RETAIN_SOURCE DEBUG && \
-    ((__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_15_0)) || \
-    ((__TV_OS_VERSION_MAX_ALLOWED >= __TVOS_15_0))
-
 // This strip the un-wanted CGImageProperty, like the internal CGImageSourceRef in iOS 15+
 // However, CGImageCreateCopy still keep those CGImageProperty, not suit for our use case
 static CGImageRef __nullable SDCGImageCreateCopy(CGImageRef cg_nullable image) {
@@ -301,8 +303,13 @@ static CGImageRef __nullable SDCGImageCreateCopy(CGImageRef cg_nullable image) {
     if (@available(iOS 15, tvOS 15, *)) {
         // Assert here to check CGImageRef should not retain the CGImageSourceRef and has possible thread-safe issue (this is behavior on iOS 15+)
         // If assert hit, fire issue to https://github.com/SDWebImage/SDWebImage/issues and we update the condition for this behavior check
-        extern CGImageSourceRef CGImageGetImageSource(CGImageRef);
-        NSCAssert(!CGImageGetImageSource(imageRef), @"Animated Coder created CGImageRef should not retain CGImageSourceRef, which may cause thread-safe issue without lock");
+        static dispatch_once_t onceToken;
+        dispatch_once(&onceToken, ^{
+            SDCGImageGetImageSource = dlsym(RTLD_DEFAULT, "CGImageGetImageSource");
+        });
+        if (SDCGImageGetImageSource) {
+            NSCAssert(!SDCGImageGetImageSource(imageRef), @"Animated Coder created CGImageRef should not retain CGImageSourceRef, which may cause thread-safe issue without lock");
+        }
     }
 #endif