Combine: Add a sample app (#8113)

A SwiftUI app that shows how to use the Combine-enabled APIs in context.

The  app contains a basic drill-down menu navigation and a simple screen that shows how to use Anonymous Auth and authStateDidChangePublisher.

As we add more publishers, their use should be demonstrated in this app as well.

The app currently needs a prod Firebase project, so one of the next steps will be to enable it for local Emulators.

#no-changelog

Example/CombineSample/CombineSample.xcodeproj/project.pbxproj

@@ -0,0 +1,428 @@
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Example/CombineSample/CombineSample.xcodeproj/xcshareddata/xcschemes/CombineSample.xcscheme

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+               BuildableName = "CombineSample.app"
+               BlueprintName = "CombineSample"
+               ReferencedContainer = "container:CombineSample.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "885F5FAC2653BE0D00848BCF"
+            BuildableName = "CombineSample.app"
+            BlueprintName = "CombineSample"
+            ReferencedContainer = "container:CombineSample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "885F5FAC2653BE0D00848BCF"
+            BuildableName = "CombineSample.app"
+            BlueprintName = "CombineSample"
+            ReferencedContainer = "container:CombineSample.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Example/CombineSample/CombineSample.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "container:CombineSample.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:../../../firebase-ios-sdk">
+   </FileRef>
+</Workspace>

Example/CombineSample/CombineSample.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>

Example/CombineSample/CombineSample/App/CombineSampleApp.swift

@@ -0,0 +1,33 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+import Firebase
+
+@main
+struct CombineSampleApp: App {
+  init() {
+    FirebaseApp.configure()
+  }
+
+  var body: some Scene {
+    WindowGroup {
+      NavigationView {
+        MenuView()
+      }
+      // see https://stackoverflow.com/questions/63740788/swiftui-displaymodebuttonitem-is-internally-managed
+      .navigationViewStyle(StackNavigationViewStyle())
+    }
+  }
+}

Example/CombineSample/CombineSample/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0.157",
+          "green" : "0.792",
+          "red" : "1.000"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example/CombineSample/CombineSample/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,302 @@
+{
+  "images" : [
+    {
+      "filename" : "40.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "60.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "29.png",
+      "idiom" : "iphone",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "58.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "87.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "80.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "120.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "57.png",
+      "idiom" : "iphone",
+      "scale" : "1x",
+      "size" : "57x57"
+    },
+    {
+      "filename" : "114.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "57x57"
+    },
+    {
+      "filename" : "120.png",
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "filename" : "180.png",
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "filename" : "20.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "40.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "filename" : "29.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "58.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "40.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "80.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "filename" : "50.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "50x50"
+    },
+    {
+      "filename" : "100.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "50x50"
+    },
+    {
+      "filename" : "72.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "72x72"
+    },
+    {
+      "filename" : "144.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "72x72"
+    },
+    {
+      "filename" : "76.png",
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "filename" : "152.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "filename" : "167.png",
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "filename" : "1024.png",
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    },
+    {
+      "filename" : "48.png",
+      "idiom" : "watch",
+      "role" : "notificationCenter",
+      "scale" : "2x",
+      "size" : "24x24",
+      "subtype" : "38mm"
+    },
+    {
+      "filename" : "55.png",
+      "idiom" : "watch",
+      "role" : "notificationCenter",
+      "scale" : "2x",
+      "size" : "27.5x27.5",
+      "subtype" : "42mm"
+    },
+    {
+      "filename" : "58.png",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "87.png",
+      "idiom" : "watch",
+      "role" : "companionSettings",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "filename" : "80.png",
+      "idiom" : "watch",
+      "role" : "appLauncher",
+      "scale" : "2x",
+      "size" : "40x40",
+      "subtype" : "38mm"
+    },
+    {
+      "filename" : "88.png",
+      "idiom" : "watch",
+      "role" : "appLauncher",
+      "scale" : "2x",
+      "size" : "44x44",
+      "subtype" : "40mm"
+    },
+    {
+      "filename" : "100.png",
+      "idiom" : "watch",
+      "role" : "appLauncher",
+      "scale" : "2x",
+      "size" : "50x50",
+      "subtype" : "44mm"
+    },
+    {
+      "filename" : "172.png",
+      "idiom" : "watch",
+      "role" : "quickLook",
+      "scale" : "2x",
+      "size" : "86x86",
+      "subtype" : "38mm"
+    },
+    {
+      "filename" : "196.png",
+      "idiom" : "watch",
+      "role" : "quickLook",
+      "scale" : "2x",
+      "size" : "98x98",
+      "subtype" : "42mm"
+    },
+    {
+      "filename" : "216.png",
+      "idiom" : "watch",
+      "role" : "quickLook",
+      "scale" : "2x",
+      "size" : "108x108",
+      "subtype" : "44mm"
+    },
+    {
+      "filename" : "1024.png",
+      "idiom" : "watch-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    },
+    {
+      "filename" : "16.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "32.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "32.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "64.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "128.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "256.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "256.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "512.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "512.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : "1024.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Example/CombineSample/CombineSample/Assets.xcassets/Contents.json

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

Example/CombineSample/CombineSample/Info.plist

@@ -0,0 +1,50 @@
+<?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>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<true/>
+	</dict>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+	<key>UILaunchScreen</key>
+	<dict/>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

Example/CombineSample/CombineSample/Preview Content/Preview Assets.xcassets/Contents.json

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

Example/CombineSample/CombineSample/ViewModels/Authentication/AnonymousSignInViewModel.swift

@@ -0,0 +1,47 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+import Firebase
+import FirebaseCombineSwift
+import Combine
+
+class AnonymousSignInViewModel: UserInfoViewModel {
+  private var cancellables = Set<AnyCancellable>()
+
+  @Published var errorMessage: String = ""
+
+  func signIn() {
+    Auth.auth().signInAnonymously()
+      .map { $0.user }
+      .catch { error -> Just<User?> in
+        if (error as NSError).code == AuthErrorCode.adminRestrictedOperation.rawValue {
+          print("Make sure to enable Anonymous Auth for your project")
+        } else {
+          print(error)
+        }
+        return Just(nil)
+      }
+      .compactMap { $0 }
+      .sink { user in
+        print("User \(user.uid) signed in")
+      }
+      .store(in: &cancellables)
+  }
+
+  func signOut() {
+    try? Auth.auth().signOut()
+    user = nil
+  }
+}

Example/CombineSample/CombineSample/ViewModels/Authentication/UserInfoViewModel.swift

@@ -0,0 +1,35 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Firebase
+import FirebaseCombineSwift
+import Combine
+
+class UserInfoViewModel: ObservableObject {
+  @Published var user: User?
+
+  @Published var isSignedIn = false
+
+  private var cancellables = Set<AnyCancellable>()
+
+  init() {
+    Auth.auth().authStateDidChangePublisher()
+      .map { $0 }
+      .assign(to: &$user)
+
+    $user
+      .map { $0 != nil }
+      .assign(to: &$isSignedIn)
+  }
+}

Example/CombineSample/CombineSample/Views/Authentication/AnonymousSignInView.swift

@@ -0,0 +1,46 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+import Firebase
+import FirebaseCombineSwift
+import Combine
+
+struct AnonymousSignInView: View {
+  @StateObject var viewModel = AnonymousSignInViewModel()
+
+  var body: some View {
+    Form {
+      UserInfoView(viewModel: viewModel)
+      Section(header: Text("Sign in anonymously")) {
+        Button(action: viewModel.signIn) {
+          Text("Sign in")
+        }
+        .disabled(viewModel.isSignedIn)
+
+        Button(action: viewModel.signOut) {
+          Text("Sign out")
+        }
+        .disabled(!viewModel.isSignedIn)
+      }
+    }
+    .navigationTitle("Anonymous Auth")
+  }
+}
+
+struct AnonymousSignInView_Previews: PreviewProvider {
+  static var previews: some View {
+    AnonymousSignInView()
+  }
+}

Example/CombineSample/CombineSample/Views/Authentication/AuthenticationMenuView.swift

@@ -0,0 +1,38 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+
+struct AuthenticationMenuView: View {
+  @StateObject var viewModel = UserInfoViewModel()
+
+  var body: some View {
+    List {
+      UserInfoView(viewModel: viewModel)
+      Section(header: Text("Demos")) {
+        NavigationLink(destination: AnonymousSignInView()) {
+          Label("Anonymous Sign In", systemImage: "person.fill.questionmark")
+        }
+      }
+    }
+    .listStyle(InsetGroupedListStyle())
+    .navigationTitle("Firebase Auth")
+  }
+}
+
+struct AuthenticationMenuView_Previews: PreviewProvider {
+  static var previews: some View {
+    AuthenticationMenuView()
+  }
+}

Example/CombineSample/CombineSample/Views/Authentication/UserInfoView.swift

@@ -0,0 +1,40 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+
+struct UserInfoView: View {
+  @ObservedObject var viewModel: UserInfoViewModel
+
+  var body: some View {
+    Section(header: Text("User Info")) {
+      LabelTextView(
+        "User state",
+        value: viewModel.isSignedIn ? "User is signed in" : "User is signed out"
+      )
+      LabelTextView("User ID", value: viewModel.user?.uid ?? "")
+      LabelTextView("Display name", value: viewModel.user?.displayName ?? "")
+      LabelTextView("Email", value: viewModel.user?.email ?? "")
+    }
+  }
+}
+
+struct UserInfoView_Previews: PreviewProvider {
+  static let viewModel = UserInfoViewModel()
+  static var previews: some View {
+    Form {
+      UserInfoView(viewModel: viewModel)
+    }
+  }
+}

Example/CombineSample/CombineSample/Views/LabelTextView.swift

@@ -0,0 +1,43 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+
+struct LabelTextView: View {
+  var label: String
+  var value: String
+
+  init(_ label: String, value: String) {
+    self.label = label
+    self.value = value
+  }
+
+  var body: some View {
+    VStack(alignment: .leading) {
+      Text(label)
+        .font(.caption)
+        .foregroundColor(.accentColor)
+      Text(value)
+    }
+  }
+}
+
+struct LabelTextView_Previews: PreviewProvider {
+  static var previews: some View {
+    Form {
+      LabelTextView("Hello", value: "World")
+    }
+    .previewLayout(.device)
+  }
+}

Example/CombineSample/CombineSample/Views/MenuView.swift

@@ -0,0 +1,41 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import SwiftUI
+
+struct MenuView: View {
+  var body: some View {
+    List {
+      Section(header: Text("Demos")) {
+        NavigationLink(destination: AuthenticationMenuView()) {
+          Label("Firebase Authentication", systemImage: "key")
+        }
+        NavigationLink(destination: Text("Not implemented yet")) {
+          Label("Cloud Functions", systemImage: "gearshape.2")
+        }
+        NavigationLink(destination: Text("Not implemented yet")) {
+          Label("Cloud Firestore", systemImage: "externaldrive.badge.icloud")
+        }
+      }
+    }
+    .listStyle(InsetGroupedListStyle())
+    .navigationTitle("Firebase & Combine")
+  }
+}
+
+struct MenuView_Previews: PreviewProvider {
+  static var previews: some View {
+    MenuView()
+  }
+}

Example/CombineSample/README.md

@@ -0,0 +1,64 @@
+# Firebase & Combine Sample
+
+This sample demonstrates how to use Firebase's Combine APIs.
+
+## How to use
+
+### Set up a Firebase project
+
+1. Create a new Firebase project via the [Firebase console](https://console.firebase.google.com/)
+2. Enable the required Firebase services in the Firebase project you created in step 1
+   * Firebase Authentication
+      * Enable Anonymous Auth
+3. Register this demo app as an iOS project
+4. Download `GoogleServices-Info.plist` and drag it into your project (it's easiest if you place it just next to `Info.plist`)
+
+
+### Enable Combine
+
+Currently, Combine support for Firebase is still under development, which is why we haven't enabled the respective Swift Package Manager products yet. You need to do so yourself:
+
+In `Package.swift`, find the following lines:
+
+```swift
+    // TODO: Re-enable after API review passes.
+    // .library(
+    //   name: "FirebaseCombineSwift-Beta",
+    //   targets: ["FirebaseCombineSwift"]
+    // ),
+    // .library(
+    //   name: "FirebaseAuthCombineSwift-Beta",
+    //   targets: ["FirebaseAuthCombineSwift"]
+    // ),
+    // .library(
+    //   name: "FirebaseFunctionsCombineSwift-Beta",
+    //   targets: ["FirebaseFunctionsCombineSwift"]
+    // ),
+    // .library(
+    //   name: "FirebaseStorageCombineSwift-Beta",
+    //   targets: ["FirebaseStorageCombineSwift"]
+    // ),
+```
+
+ and uncomment them:
+ ```swift
+    // TODO: Re-enable after API review passes.
+    .library(
+      name: "FirebaseCombineSwift-Beta",
+      targets: ["FirebaseCombineSwift"]
+    ),
+    .library(
+      name: "FirebaseAuthCombineSwift-Beta",
+      targets: ["FirebaseAuthCombineSwift"]
+    ),
+    .library(
+      name: "FirebaseFunctionsCombineSwift-Beta",
+      targets: ["FirebaseFunctionsCombineSwift"]
+    ),
+    .library(
+      name: "FirebaseStorageCombineSwift-Beta",
+      targets: ["FirebaseStorageCombineSwift"]
+    ),
+ ```
+
+ The app should now compile.