关闭然后打开特定 ViewController 的 iOS 应用程序

Question

我一直在 SO 上寻找这个问题的答案，但 none 似乎有效。我的问题是：当我关闭然后重新打开 Swift 中的应用程序时，我如何才能使其转到特定的 ViewController（即转到 PIN 登录页面）？我知道它与 App Delegate 有关，但所有其他建议都以崩溃告终。下面是我的应用程序删除：

class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?

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

    FirebaseApp.configure()

    return true
}

func applicationWillResignActive(_ application: UIApplication) {
}

func applicationDidEnterBackground(_ application: UIApplication) {

    let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
    let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    window?.inputViewController?.present(secondViewController, animated: true, completion: nil)
}

func applicationWillEnterForeground(_ application: UIApplication) {
}

func applicationDidBecomeActive(_ application: UIApplication) {
}

Answer 1

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    self.window = UIWindow(frame: UIScreen.main.bounds)

    let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)

    let initialViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()

    return true
}

Answer 2

此处创建扩展以找出当前可见控制器

extension UIViewController {
    func topMostViewController() -> UIViewController {
        if self.presentedViewController == nil {
            return self
        }
        if let navigation = self.presentedViewController as? UINavigationController {
            return navigation.visibleViewController.topMostViewController()
        }
        if let tab = self.presentedViewController as? UITabBarController {
            if let selectedTab = tab.selectedViewController {
                return selectedTab.topMostViewController()
            }
            return tab.topMostViewController()
        }
        return self.presentedViewController!.topMostViewController()
    }
}

extension UIApplication {
    func topMostViewController() -> UIViewController? {
        return self.keyWindow?.rootViewController?.topMostViewController()
    }
}

之后你可以随时使用它

let topMostViewController = UIApplication.shared.topMostViewController()

 let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    topMostViewController.present(secondViewController, animated: true, completion: nil)

Answer 3

您应该将与演示相关的代码放在 applicationWillEnterForeground 方法中，这将在用户下次单击 appIcon 并启动应用程序时调用。

这是让它工作的代码。

func applicationWillEnterForeground(_ application: UIApplication) {

        let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
    let secondViewController: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
    window?.rootViewController?.present(secondViewController, animated: true, completion: nil)
}

希望对您有所帮助。

Answer 4

假设您要将应用程序从后台状态移至前台状态，您可以尝试这样做：

  func applicationWillEnterForeground(_ application: UIApplication) {

       // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
       let mainStoryboard: UIStoryboard = UIStoryboard(name:"Main",bundle:Bundle.main)
       let pinViewConroller: PINViewController = mainStoryboard.instantiateViewController(withIdentifier: "PINViewController") as! PINViewController
       self.window?.rootViewController.present(pinViewConroller, animated: false, completion: nil)

    }

Answer 5

func presentToVC(yourVC:UIViewController){
        let navEditorViewController: UINavigationController = UINavigationController(rootViewController: yourVC)
        navEditorViewController.isNavigationBarHidden = true
        navEditorViewController.interactivePopGestureRecognizer?.delegate = self
        (self.window?.rootViewController as! UINavigationController).visibleViewController?.present(navEditorViewController, animated: true, completion: nil)
    }

关闭然后打开特定 ViewController 的 iOS 应用程序

Close and Then Open iOS Application to Specific ViewController

ios

appdelegate

swift