Lập trình Storyboard - 1

 Vòng đời của 1 View Controller được tính từ lúc nó nạp vào bộ nhớ RAM cho tới khi nó bị huỷ. 

1. File ViewController.swift

Vòng đời 1 view controller theo thứ như sau:

override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view.

        //Khi ma chuong trinh khoi tao

        print("Run 1")

    }

    

    override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        //Khi chuong trinh se khoi tao

        print("Run 2")

    }

    

    override func viewDidAppear(_ animated: Bool) {

        super.viewDidAppear(animated)

        //Khi chuong trinh da khoi tao

        print("Run 3")

    }

    

    override func viewWillDisappear(_ animated: Bool) {

        super.viewWillDisappear(animated)

        print("Run 4")

    }

    

    override func viewDidDisappear(_ animated: Bool) {

        super.viewDidDisappear(animated)

        print("Run 5")

    }

    

    //Vong doi 1 View Controller

    //1. ViewdidLoad

    //2. ViewWillAppear

    //3. viewDidAppear

    //4. viewWillAppear

    //5. viewDidAppear

2. File AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        // Override point for customization after application launch.

        

        print("App Cycle Run 1")

        //Chay dau tien truoc nhat

        return true

    }

3. File SceneDelegate.swift

 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 necessarily discarded (see `application:didDiscardSceneSessions` instead).

        //Duoc khoi chay khi man hinh xoa khoi he thong. Trong trang thai Kill App

        print("App Cycle Run 6")        

    }

    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.        

        //Duoc goi khi app chay nen tu trang thai InActive sang Actibe        

        print("App Cycle Run 3")

    }

    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).

        

        //Duoc goi khi App chuyen trang thai tu Active sang InActive

        print("App Cycle Run 4")        

    }

    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.        

        print("App Cycle Run 2")

    }

    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.

        

        print("App Cycle Run 5")

    }

Kết quả thứ tự: 

App Cycle Run 1

Run 1

Run 2

App Cycle Run 2

App Cycle Run 3

Run 3

App Cycle Run 4

App Cycle Run 5

App Cycle Run 2

App Cycle Run 6

Run 4

Run 5