Add Time Travel

2026-01-11 20:00:26 +01:00 · 2019-06-06 13:54:57 +03:00
parent d49b874594
commit 838c9a51ab
24 changed files with 1122 additions and 0 deletions
--- a/Examples/TimeTravel/.gitignore
+++ b/Examples/TimeTravel/.gitignore
@@ -0,0 +1,82 @@
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+#
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# Accio dependency management
+Dependencies/
+.accio/
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+#
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/
--- a/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.pbxproj
+++ b/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.pbxproj
@@ -0,0 +1,421 @@
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+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.tdonnelly.SwiftUITimeTravel;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		22316DD822A7B255004124F2 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_ASSET_PATHS = "SwiftUITimeTravel/Preview\\ Content";
+				DEVELOPMENT_TEAM = MM763NMPEA;
+				ENABLE_PREVIEWS = YES;
+				INFOPLIST_FILE = SwiftUITimeTravel/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = com.tdonnelly.SwiftUITimeTravel;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		22316DBD22A7B255004124F2 /* Build configuration list for PBXProject "SwiftUITimeTravel" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				22316DD422A7B255004124F2 /* Debug */,
+				22316DD522A7B255004124F2 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		22316DD622A7B255004124F2 /* Build configuration list for PBXNativeTarget "SwiftUITimeTravel" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				22316DD722A7B255004124F2 /* Debug */,
+				22316DD822A7B255004124F2 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 22316DBA22A7B255004124F2 /* Project object */;
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.xcworkspace/contents.xcworkspacedata
+++ b/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:SwiftUITimeTravel.xcodeproj">
+   </FileRef>
+</Workspace>
--- a/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
+++ b/Examples/TimeTravel/SwiftUITimeTravel.xcodeproj/project.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>
--- a/Examples/TimeTravel/SwiftUITimeTravel/AppDelegate.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/AppDelegate.swift
@@ -0,0 +1,33 @@
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    func applicationWillTerminate(_ application: UIApplication) {
+        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+
--- a/Examples/TimeTravel/SwiftUITimeTravel/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/Examples/TimeTravel/SwiftUITimeTravel/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/Assets.xcassets/Contents.json
+++ b/Examples/TimeTravel/SwiftUITimeTravel/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/Base.lproj/LaunchScreen.storyboard
+++ b/Examples/TimeTravel/SwiftUITimeTravel/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>
--- a/Examples/TimeTravel/SwiftUITimeTravel/ContentView.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/ContentView.swift
@@ -0,0 +1,17 @@
+import SwiftUI
+
+struct ContentView : View {
+    var body: some View {
+        TimeTravelView(initialState: TodoState()) {
+            TodoListView()
+        }
+    }
+}
+
+#if DEBUG
+struct ContentView_Previews : PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/Info.plist
+++ b/Examples/TimeTravel/SwiftUITimeTravel/Info.plist
@@ -0,0 +1,62 @@
+<?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>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UILaunchStoryboardName</key>
+					<string>LaunchScreen</string>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<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>
--- a/Examples/TimeTravel/SwiftUITimeTravel/Preview
+++ b/Examples/TimeTravel/SwiftUITimeTravel/Preview
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/SceneDelegate.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/SceneDelegate.swift
@@ -0,0 +1,51 @@
+import UIKit
+import SwiftUI
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+
+    var window: UIWindow?
+
+
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
+        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
+        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
+
+        // Use a UIHostingController as window root view controller
+        let window = UIWindow(frame: UIScreen.main.bounds)
+        window.rootViewController = UIHostingController(rootView: ContentView())
+        self.window = window
+        window.makeKeyAndVisible()
+    }
+
+    func sceneDidDisconnect(_ scene: UIScene) {
+        // Called as the scene is being released by the system.
+        // This occurs shortly after the scene enters the background, or when its session is discarded.
+        // Release any resources associated with this scene that can be re-created the next time the scene connects.
+        // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
+    }
+
+    func sceneDidBecomeActive(_ scene: UIScene) {
+        // Called when the scene has moved from an inactive state to an active state.
+        // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
+    }
+
+    func sceneWillResignActive(_ scene: UIScene) {
+        // Called when the scene will move from an active state to an inactive state.
+        // This may occur due to temporary interruptions (ex. an incoming phone call).
+    }
+
+    func sceneWillEnterForeground(_ scene: UIScene) {
+        // Called as the scene transitions from the background to the foreground.
+        // Use this method to undo the changes made on entering the background.
+    }
+
+    func sceneDidEnterBackground(_ scene: UIScene) {
+        // Called as the scene transitions from the foreground to the background.
+        // Use this method to save data, release shared resources, and store enough scene-specific state information
+        // to restore the scene back to its current state.
+    }
+
+
+}
+
--- a/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/StateMachine.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/StateMachine.swift
@@ -0,0 +1,11 @@
+/// Conforming types serve as the state of a time travelable application
+public protocol StateMachine {
+    
+    /// Events define things that can happen within your application that change its state.
+    ///
+    /// This might include things like text editing, button taps, or network responses.
+    associatedtype Event
+    
+    /// Applies an event to the current state.
+    mutating func update(with event: Event)
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/Store.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/Store.swift
@@ -0,0 +1,44 @@
+import SwiftUI
+import Combine
+
+public final class Store<StateType>: BindableObject where StateType: StateMachine {
+    
+    private let initialState: StateType
+    private var subsequentStates: [StateType] = []
+
+    public let didChange = PassthroughSubject<Void, Never>()
+    
+    public init(state: StateType) {
+        initialState = state
+    }
+    
+    var allStates: [StateType] {
+        [[initialState], subsequentStates].flatMap({ $0 })
+    }
+    
+    var stateCount: Int {
+        1 + subsequentStates.count
+    }
+    
+    var currentStateIndex: Int = 0 {
+        didSet {
+            withAnimation {
+                didChange.send(())
+            }
+        }
+    }
+    
+    /// The current state of the store. This will update as time traveling occurs.
+    public var state: StateType {
+        allStates[currentStateIndex]
+    }
+    
+    /// Dispatches an event to be applied to the current state.
+    public func dispatch(event: StateType.Event) {
+        var newState = state
+        newState.update(with: event)
+        subsequentStates.append(newState)
+        currentStateIndex = stateCount - 1
+    }
+    
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/TimeTravelBarView.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/TimeTravelBarView.swift
@@ -0,0 +1,25 @@
+import SwiftUI
+
+struct TimeTravelBarView : View {
+    
+    @EnvironmentObject var store: Store<TodoState>
+    
+    var body: some View {
+        let indexBinding = Binding<Double>(
+            getValue: { Double(self.store.currentStateIndex) },
+            setValue: { self.store.currentStateIndex = Int($0) })
+
+        return Slider(value: indexBinding, from: 0, through: Double(store.stateCount-1))
+            .background(Color.white)
+            .frame(height: 44.0, alignment: .bottom)
+            .padding()
+    }
+}
+
+#if DEBUG
+struct TimeTravelBarView_Previews : PreviewProvider {
+    static var previews: some View {
+        TimeTravelBarView()
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/TimeTravelView.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TimeTravelView/TimeTravelView.swift
@@ -0,0 +1,39 @@
+import SwiftUI
+
+public struct TimeTravelView<StateType, Content>: View where StateType: StateMachine, Content: View {
+    
+    let initialState: StateType
+    
+    private let content: Content
+    
+    @State var store: Store<StateType>? = nil
+    
+    public init(initialState: StateType, content: () -> Content) {
+        self.initialState = initialState
+        self.content = content()
+    }
+    
+    public var body: some View {
+        
+        let store = self.store ?? Store(state: initialState)
+        if (self.store == nil) {
+            self.store = store
+        }
+
+        return VStack {
+            content
+            TimeTravelBarView()
+        }
+        .environmentObject(store)
+    }
+}
+
+#if DEBUG
+struct TimeTravelView_Previews : PreviewProvider {
+    static var previews: some View {
+        TimeTravelView(initialState: TodoState()) {
+            TodoListView()
+        }
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
@@ -0,0 +1,40 @@
+import SwiftUI
+
+struct AddItemView: View {
+    
+    @EnvironmentObject var store: Store<TodoState>
+    
+    var body: some View {
+        
+        let textBinding = Binding<String>(
+            getValue: { self.store.state.partialItemName },
+            setValue: { self.store.dispatch(event: .changePartialItemName($0)) })
+        
+        return VStack(spacing: 16) {
+            TextField(textBinding, placeholder: Text("Title"))
+            Button(action: {
+                self.store.dispatch(event: .addItem)
+            }) {
+                HStack {
+                    Spacer()
+                    Text("Add").padding([.top, .bottom], 8.0)
+                    Spacer()
+                }
+
+                }
+                .relativeWidth(1.0)
+                .background(Color.accentColor)
+                .disabled(store.state.partialItemName.isEmpty)
+                .foregroundColor(.white)
+                .cornerRadius(8.0)
+        }
+        .padding()
+    }
+}
+#if DEBUG
+struct AddItemView_Previews : PreviewProvider {
+    static var previews: some View {
+        AddItemView()
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
@@ -0,0 +1,27 @@
+import SwiftUI
+
+struct ModalDimmingView : View {
+    
+    @EnvironmentObject var store: Store<TodoState>
+    
+    var body: some View {
+        Color
+            .black
+            .relativeWidth(1.0)
+            .relativeHeight(1.0)
+            .opacity(0.3)
+            .edgesIgnoringSafeArea([.bottom, .top])
+            .transition(.opacity)
+            .tapAction {
+                self.store.dispatch(event: .cancelCreatingItem)
+            }
+    }
+}
+
+#if DEBUG
+struct ModalDimmingView_Previews : PreviewProvider {
+    static var previews: some View {
+        ModalDimmingView()
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Internal
@@ -0,0 +1,26 @@
+import SwiftUI
+
+struct TodoListItemView : View {
+    
+    @EnvironmentObject var store: Store<TodoState>
+    
+    let item: TodoItem
+
+    var body: some View {
+        let binding = Binding(
+            getValue: { self.item.isFinished },
+            setValue: { self.store.dispatch(event: .setItemDone(identifier: self.item.id, isDone: $0)) })
+        
+        return Toggle(isOn: binding) {
+            Text(item.title)
+        }
+    }
+}
+
+#if DEBUG
+struct TodoListItemView_Previews : PreviewProvider {
+    static var previews: some View {
+        TodoListItemView(item: TodoItem(id: UUID(), title: "Test", isFinished: false))
+    }
+}
+#endif
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Model/TodoItem.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Model/TodoItem.swift
@@ -0,0 +1,7 @@
+import SwiftUI
+
+struct TodoItem: Identifiable {
+    var id: UUID
+    var title: String
+    var isFinished: Bool
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Model/TodoState.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/Model/TodoState.swift
@@ -0,0 +1,39 @@
+import SwiftUI
+
+struct TodoState {
+    var isCreatingItem: Bool = false
+    var partialItemName: String = ""
+    var todoItems: [TodoItem] = []
+}
+
+extension TodoState: StateMachine {
+    
+    enum Event {
+        case startCreatingItem
+        case cancelCreatingItem
+        case changePartialItemName(String)
+        case addItem
+        case setItemDone(identifier: UUID, isDone: Bool)
+    }
+    
+    mutating func update(with event: TodoState.Event) {
+        switch event {
+        case .addItem:
+            todoItems.append(TodoItem(id: UUID(), title: partialItemName, isFinished: false))
+            partialItemName = ""
+            isCreatingItem = false
+        case .changePartialItemName(let name):
+            partialItemName = name
+        case .cancelCreatingItem:
+            isCreatingItem = false
+        case .startCreatingItem:
+            isCreatingItem = true
+            partialItemName = ""
+        case .setItemDone(let identifier, let isDone):
+            if let index = todoItems.firstIndex(where: { $0.id == identifier }) {
+                todoItems[index].isFinished = isDone
+            }
+        }
+    }
+    
+}
--- a/Examples/TimeTravel/SwiftUITimeTravel/TodoList/TodoListView.swift
+++ b/Examples/TimeTravel/SwiftUITimeTravel/TodoList/TodoListView.swift
@@ -0,0 +1,43 @@
+import SwiftUI
+
+struct TodoListView : View {
+    
+    @EnvironmentObject var store: Store<TodoState>
+    
+    var body: some View {
+        ZStack {
+            NavigationView {
+                List(store.state.todoItems) { item in TodoListItemView(item: item) }
+                    .navigationBarTitle(Text("Todo List"))
+                    .navigationBarItems(trailing: Button(action: {
+                        withAnimation {
+                            self.store.dispatch(event: .startCreatingItem)
+                        }
+                    }, label: { Image(systemName: "plus.circle") })) }
+            
+            if store.state.isCreatingItem {
+                
+                ModalDimmingView()
+                
+                VStack {
+                    Spacer()
+                    AddItemView()
+                        .relativeWidth(1.0)
+                        .background(Color.white)
+                        .cornerRadius(12.0)
+                        .shadow(radius: 16.0)
+                        .padding()
+                    Spacer()
+                }
+                .transition(.move(edge: .bottom))
+            }
+        }
+    }
+}
+#if DEBUG
+struct TodoListView_Previews : PreviewProvider {
+    static var previews: some View {
+        TodoListView()
+    }
+}
+#endif
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ If you have project, make a pull request.
 - [Combine using GitHub API](#combine-using-github-api)
 - [Interfacing With UIKit](#interfacing-with-uikit)
 - [GitHub Search](#github-search)
+- [Time Travel](#time-travel)
 - [Drawing and Animation](#drawing-and-animation)
    - [Drawing Paths And Shapes](#drawing-paths-and-shapes)
    - [Animating Views And Transitions](#animating-views-and-transitions)
@@ -57,6 +58,10 @@ If you have project, make a pull request.

 <img src="Resources/GitHubSearch.png" width="260">

+### Time Travel
+
+<img src="Resources/TimveTravel.gif" width="260">
+
 ## Drawing and Animation

 #### Drawing Paths And Shapes
--- a/Resources/TimeTravel.gif
+++ b/Resources/TimeTravel.gif