iOS 13 之后自定义 Window 不显示解决 (SceneDelegate)

let newWindow = UIWindow()
newWindow.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)
newWindow.backgroundColor = UIColor.red
newWindow.isHidden = false

let newWindow = UIWindow()
newWindow.frame = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)
newWindow.backgroundColor = UIColor.red
newWindow.windowLevel = UIWindow.Level.alert
newWindow.makeKeyAndVisible()

if #available(iOS 13.0, *) {
   // 通知注册方式看场景进行添加，不需要可以去除
   NotificationCenter.default.addObserver(forName: UIScene.willConnectNotification, object: nil, queue: nil) { (note) in
       newWindow.windowScene = note.object as? UIWindowScene
   }
   // 主要注册
   for windowScene in UIApplication.shared.connectedScenes {
       if (windowScene.activationState == UIScene.ActivationState.foregroundActive) {
           newWindow.windowScene = windowScene as? UIWindowScene
       }
   }
}

if (@available(iOS 13.0, *)) {
  // 通知注册方式看场景进行添加，这里我就不写了
  // 主要注册
  for (UIWindowScene *windowScene in [UIApplication sharedApplication].connectedScenes) {
      if (windowScene.activationState == UISceneActivationStateForegroundActive) {
          newWindow.windowScene = windowScene;
          break;
      }
  }
}