UIWindow覆盖不可见

Question

尝试在IOS应用程序中为键UIWindow添加一个覆盖窗口。然而，新的覆盖UIWindow似乎在任何地方都不可见。

但是，基于lldb，它似乎正在成功地添加：

(lldb) po UIApplication.shared.windows
▿ 2 elements
  - 0 : <UIWindow: 0x7fdfd3d0aec0; frame = (0 0; 375 667); gestureRecognizers = <NSArray: 0x60800004d680>; layer = <UIWindowLayer: 0x608000220980>>
  - 1 : <UIWindow: 0x7fdfd3c0d010; frame = (0 0; 375 667); gestureRecognizers = <NSArray: 0x60000004c9c0>; layer = <UIWindowLayer: 0x6000002216e0>>

在调试中，

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let vc = UIViewController()
    vc.view.backgroundColor = UIColor.blue

    let window = UIWindow()
    window.frame = self.view.bounds
    window.backgroundColor = UIColor.blue
    window.windowLevel = UIWindowLevelStatusBar
    window.rootViewController = vc
    window.isHidden = false
}

感谢你的任何暗示/帮助

Answer 1

在viewDidLoad()方法退出后，您的窗口将被解除分配。你需要强烈保留你的第二个窗口。