self.windownil

2023年3月17日 — 从现象反推过程，既然代码执行了，那么很大可能是self.window没有显示在屏幕上。 ... // If nil, window will not appear on any screen.

rootViewController dismissViewControllerAnimated:YES completion:nil]; self. ... window makeKeyWindow]; // self.window.hidden = NO ... windowLevel == ...

2021年5月8日 — I tried to confirm this in code, but I don't get any value for the view's superview. class ViewController: UIViewController override func ...

I'm investigating a crash where keyWindow is nil when I don't expect it to be nil. ... self.view.window?.windowScene . If you're kicking ... The key window just ...

In this case, it is normal, window is nil in AppDelegate. Need to implement your code in func scene(_ scene: UIScene, willConnectTo session: UISceneSession ...

2014年11月23日 — You need to create the window yourself in AppDelegate if not using the main interface option: self.window = UIWindow(frame:UIScreen.

2020年6月22日 — In iOS 13 I have set up my app that works fine and the window's root controller is a tab bar controller and I have done this setup in my scene ...

2020年6月30日 — ... self.window =[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds]; //设置窗口根窗口控制器self. ... nil]; self.window.rootViewController= ...

2015年3月5日 — 1.初始化AppDelegate的window，此刻window对象存在2.初始化window的rootViewController,在初始化rootViewControl...

2019年3月17日 — Hello there,. I am trying to create a ViewController over any other view using UIWindow. I can display the window, however, ...