Add examples project

Examples/Example To-Do App/SwiftUITodo/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+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.
+  }
+
+
+}
+

Examples/Example To-Do App/SwiftUITodo/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "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"
+  }
+}

Examples/Example To-Do App/SwiftUITodo/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Examples/Example To-Do App/SwiftUITodo/Base.lproj/LaunchScreen.storyboard

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+<?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>

Examples/Example To-Do App/SwiftUITodo/Info.plist

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+<?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>

Examples/Example To-Do App/SwiftUITodo/Preview Content/Preview Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Examples/Example To-Do App/SwiftUITodo/SceneDelegate.swift

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+//
+//  SceneDelegate.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+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: NavigationView {
+      TaskListView().environmentObject(UserData())
+    })
+    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.
+  }
+
+
+}
+

Examples/Example To-Do App/SwiftUITodo/Task.swift

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+//
+//  Task.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct Task: Equatable, Hashable, Codable, Identifiable {
+  let id: UUID
+  var title: String
+  var isDone: Bool
+
+  init(title: String, isDone: Bool) {
+    self.id = UUID()
+    self.title = title
+    self.isDone = isDone
+  }
+}

Examples/Example To-Do App/SwiftUITodo/TaskEditView.swift

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+//
+//  TaskEditView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskEditView: View {
+  @EnvironmentObject var userData: UserData
+  private let task: Task
+  private var draftTitle: State<String>
+
+  init(task: Task) {
+    self.task = task
+    self.draftTitle = .init(initialValue: task.title)
+  }
+
+  var body: some View {
+    let inset = EdgeInsets(top: -8, leading: -10, bottom: -7, trailing: -10)
+    return VStack(alignment: .leading, spacing: 0) {
+      TextField(
+        self.draftTitle.binding,
+        placeholder: Text("Enter New Title..."),
+        onEditingChanged: { _ in self.updateTask() },
+        onCommit: {}
+      )
+      .background(
+        RoundedRectangle(cornerRadius: 5)
+          .fill(Color.clear)
+          .border(Color(red: 0.7, green: 0.7, blue: 0.7), width: 1 / UIScreen.main.scale, cornerRadius: 5)
+          .padding(inset)
+      )
+      .padding(EdgeInsets(
+        top: 15 - inset.top,
+        leading: 20 - inset.leading,
+        bottom: 15 - inset.bottom,
+        trailing: 20 - inset.trailing
+      ))
+
+      Spacer()
+    }
+    .navigationBarTitle(Text("Edit Task 📝"))
+  }
+
+  private func updateTask() {
+    guard let index = self.userData.tasks.firstIndex(of: self.task) else { return }
+    self.userData.tasks[index].title = self.draftTitle.value
+  }
+}

Examples/Example To-Do App/SwiftUITodo/TaskItemView.swift

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+//
+//  TaskItemView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskItemView: View {
+  @EnvironmentObject var userData: UserData
+
+  let task: Task
+  @Binding var isEditing: Bool
+
+  var body: some View {
+    return HStack {
+      if self.isEditing {
+        Image(systemName: "minus.circle")
+          .foregroundColor(.red)
+          .tapAction(count: 1) {
+            self.delete()
+          }
+        NavigationButton(destination: TaskEditView(task: task).environmentObject(self.userData)) {
+          Text(task.title)
+        }
+      } else {
+        Button(action: { self.toggleDone() }) {
+          Text(self.task.title)
+        }
+        Spacer()
+        if task.isDone {
+          Image(systemName: "checkmark").foregroundColor(.green)
+        }
+      }
+    }
+  }
+
+  private func toggleDone() {
+    guard !self.isEditing else { return }
+    guard let index = self.userData.tasks.firstIndex(where: { $0.id == self.task.id }) else { return }
+    self.userData.tasks[index].isDone.toggle()
+  }
+
+  private func delete() {
+    self.userData.tasks.removeAll(where: { $0.id == self.task.id })
+    if self.userData.tasks.isEmpty {
+      self.isEditing = false
+    }
+  }
+}

Examples/Example To-Do App/SwiftUITodo/TaskListView.swift

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+//
+//  TaskListView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskListView: View {
+  @EnvironmentObject var userData: UserData
+  @State var draftTitle: String = ""
+  @State var isEditing: Bool = false
+
+  var body: some View {
+    List {
+      TextField($draftTitle, placeholder: Text("Create a New Task..."), onCommit: self.createTask)
+      ForEach(self.userData.tasks) { task in
+        TaskItemView(task: task, isEditing: self.$isEditing)
+      }
+    }
+    .navigationBarItem(title: Text("Tasks 👀"))
+    .navigationBarItems(trailing: Button(action: { self.isEditing.toggle() }) {
+      if !self.isEditing {
+        Text("Edit")
+      } else {
+        Text("Done").bold()
+      }
+    })
+  }
+
+  private func createTask() {
+    let newTask = Task(title: self.draftTitle, isDone: false)
+    self.userData.tasks.insert(newTask, at: 0)
+    self.draftTitle = ""
+  }
+}

Examples/Example To-Do App/SwiftUITodo/UserData.swift

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+//
+//  UserData.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import Combine
+import SwiftUI
+
+private let defaultTasks: [Task] = [
+  Task(title: "Read SwiftUI Documentation 📚", isDone: false),
+  Task(title: "Watch WWDC19 Keynote 🎉", isDone: true),
+]
+
+final class UserData: BindableObject {
+  let didChange = PassthroughSubject<UserData, Never>()
+
+  @UserDefaultValue(key: "Tasks", defaultValue: defaultTasks)
+  var tasks: [Task] {
+    didSet {
+      didChange.send(self)
+    }
+  }
+}

Examples/Example To-Do App/SwiftUITodo/UserDefaultsValue.swift

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+//
+//  UserDefaultsValue.swift
+//  SwiftUITodo
+//
+//  Created by kemchenj on 2019/6/5.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import Foundation
+
+@propertyDelegate
+struct UserDefaultValue<Value: Codable> {
+
+    let key: String
+    let defaultValue: Value
+
+    var value: Value {
+        get {
+            let data = UserDefaults.standard.data(forKey: key)
+            let value = data.flatMap { try? JSONDecoder().decode(Value.self, from: $0) }
+            return value ?? defaultValue
+        }
+        set {
+            let data = try? JSONEncoder().encode(newValue)
+            UserDefaults.standard.set(data, forKey: key)
+        }
+    }
+}