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我在 AppDelegate 中使用此代码，在某些情况下它会打开登录屏幕或启动屏幕。像下面

if (mobile != nil && keepMe == true) { // skip login

        let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewController(withIdentifier: "SplashController") as UIViewController
        self.window?.rootViewController = initialViewControlleripad
        self.window?.makeKeyAndVisible()
    }
    else {// Show login

        let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewController(withIdentifier: "LoginScreen") as UIViewController
        self.window?.rootViewController = initialViewControlleripad
        self.window?.makeKeyAndVisible()
        print("Login!")
    }

当它首先打开启动屏幕时：从启动屏幕进入主菜单屏幕，如下所示

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
    let vc = self.view.window?.rootViewController
    let ViewController = storyBoard.instantiateViewController(withIdentifier: "toMenu")
   vc?.present(ViewController, animated:true, completion:nil)

它打开得很好。但是，当从应用程序委托它首先打开登录屏幕并从登录屏幕上单击按钮时，它会移动到启动画面，然后到主菜单，它会一直发出这个警告， 

 Warning: Attempt to present <SWRevealViewController: 0x7faac8839000> on <AppPhaseOne.Splash: 0x7faac7529530> whose view is not in the window hierarchy!

登录界面代码：

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
                let ViewController = storyBoard.instantiateViewController(withIdentifier: "SplashController")
                self.present(ViewController, animated:true, completion:nil)

所以viewControllers的构造是这样的：

app delegate: Splash -> mainMenu (working fine)
app delegate: Loign -> Splash -> mainMenu (giving the warning)

我知道有很多解决方案可以解决这个问题，我尝试了很多可用的解决方案，但都没有奏效。

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