'Application windows are expected to have a root view controller at the end of application launch' [

最新推荐文章于 2021-12-24 17:12:00 发布

martsforever

最新推荐文章于 2021-12-24 17:12:00 发布

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本文链接：https://blog.youkuaiyun.com/mate_ge/article/details/77676126

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本文介绍在删除Main.storyboard和launchboard.storyboard后遇到的启动异常'Application windows are expected to have a root view controller at the end of application launch'。通过正确设置rootViewController和添加导航控制器解决了该问题。

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删除Main.storyboard和launchboard.storyboard之后，将General ——》Deployment Info ——》Main Interface设置为空

在didFinishLaunchingWithOptions中添加以下代码后启动模拟器出现'Application windows are expected to have a root view controller at the end of application launch'异常

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {  
    // Override point for customization after application launch.  
  
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds);  
    self.window?.backgroundColor = UIColor.redColor();  
    self.window?.makeKeyAndVisible();

解决办法是：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {  
    // Override point for customization after application launch.  
  
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds);  
    self.window?.backgroundColor = UIColor.redColor();  
    self.window?.makeKeyAndVisible();  
    let rootViewController = UIViewController() as UIViewController;  
    let navigationController = UINavigationController(rootViewController: rootViewController) as UINavigationController;  
    self.window?.rootViewController = rootViewController;  
    self.window?.addSubview(navigationController.view);  
    return true  
}