快速登录功能

Question

我想实现自动登录功能。当我打开我的应用程序时，它将转到“ loginViewController”。登录后，我将登录ID保存为UserDefaults。如果UserDefaults具有该值，则第二次将ift转到“ SlideMenuController”。我已经在“ sceneDelegate”中编写了代码。代码是-

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    if let logId = UserDefaults.standard.value(forKey: "loginId")  {

        goToPlayerMenu()
    }
    guard let _ = (scene as? UIWindowScene) else { return }
}


func goToPlayerMenu() {
    let storyboard = UIStoryboard(name: "PlayerHomeScreen", bundle: nil)

    let homeViewController = storyboard.instantiateViewController(withIdentifier: "PlayerHomeViewController") as! PlayerHomeViewController

    let menuViewController = storyboard.instantiateViewController(withIdentifier: "PlayerMenuViewController") as! PlayerMenuViewController

    let nvc: UINavigationController = UINavigationController(rootViewController: homeViewController)
    nvc.navigationBar.barTintColor = UIColor.black
    nvc.navigationBar.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
    nvc.navigationItem.leftBarButtonItem?.tintColor = .white
    nvc.navigationBar.tintColor = UIColor.black
    //menuViewController.homeViewController = nvc
    let slideMneu  = SlideMenuController.init(mainViewController: nvc, leftMenuViewController: menuViewController)
    slideMneu.delegate = homeViewController as? SlideMenuControllerDelegate
    slideMneu.changeLeftViewWidth(UIScreen.main.bounds.width-40)
    slideMneu.automaticallyAdjustsScrollViewInsets = true
    self.window?.rootViewController = slideMneu

}

现在，如果我要注销该应用程序，我想转到登录viewcontroller。但是，由于我的rootViewController是“ slideMneu”。我无法转到“ loginViewController”。注销后是否有任何选项可以转到“ loginViewController”？

我的注销功能是-

func logout(){
UserDefaults.standard.removeObject(forKey: "customer_id")
            UserDefaults.standard.removeObject(forKey: "isContributor")
            FUser.logOutCurrentUser { (logout) in
                if logout == true{
                    print("DEBUG: Logout completed")
                }

            }
            let Alert = UIAlertController(title:Common.sharedInstance().TITLE_ALERT, message:Common.sharedInstance().CONFIRM_ALERT, preferredStyle: .alert)

            let OKButtonAction = UIAlertAction(title: Common.sharedInstance().ALERT_YES, style: UIAlertAction.Style.default) { (action:UIAlertAction!) in
                let storyBoard = UIStoryboard(name: "Main", bundle: nil)
                let LoginViewController = storyBoard.instantiateViewController(withIdentifier: "LoginViewController") as? LoginViewController
                self.navigationController?.pushViewController(LoginViewController!, animated: true)
                //                self.navigationController?.popViewController(animated: true)
            }
            let Cancel = UIAlertAction(title:Common.sharedInstance().NO, style: .default, handler: nil)

            Alert.addAction(OKButtonAction)
            Alert.addAction(Cancel)

            self.present(Alert, animated: true, completion:nil)

Answer 1

您似乎缺少window的初始化，可以通过以下方式对其进行修复：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    guard let windowScene = (scene as? UIWindowScene) else { return }
    window = UIWindow(windowScene: windowScene)
    window?.makeKeyAndVisible()
    if let logId = UserDefaults.standard.value(forKey: "loginId")  {
        goToPlayerMenu()
    }
}