UIWindow *window1 = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 320)]; window1.backgroundColor = [UIColor redColor]; window1.windowLevel = UIWindowLevelAlert; [window1 makeKeyAndVisible]; Finally I know why it doesn’t work, because window1 is a method var, and it will lost after the method executed. So I declare a new @property for it, as @property (strong, nonatomic) UIWindow *window2; and change … Read more
You can read about some of the possible causes here: Technical Q&A QA1688 – Why won’t my UIViewController rotate with the device? In your situation its probably the fact that you are adding the view as another subview to the window. Only the first subview gets the rotation events. What you can do is add … Read more
I was experiencing the same problems while upgrading my code for iOS 13 scenes pattern. With parts of your second code snippet I managed to fix everything so my windows are appearing again. I was doing the same as you except for the last line. Try removing viewController.present(…). Here’s my code: let windowScene = UIApplication.shared … Read more
If your main window is an outlet of your AppDelegate (which should be the case), you may simply use MyAppDelegate* myDelegate = (((MyAppDelegate*) [UIApplication sharedApplication].delegate)); [myDelegate.window …]
Starting with Rob’s answer I played around a bit and would like to write down some notes for others trying to get information on this topic: It is not a problem at all to add another UIWindow. Just create one and makeKeyAndVisible. Done. Remove it by making another window visible, then release the one you … Read more
Whenever I want to display some overlay on top of everything else, I just add it on top of the Application Window directly: [[[UIApplication sharedApplication] keyWindow] addSubview:someView]
That’s an easy one: [aView convertPoint:localPosition toView:nil]; … converts a point in local coordinate space to window coordinates. You can use this method to calculate a view’s origin in window space like this: [aView.superview convertPoint:aView.frame.origin toView:nil]; 2014 Edit: Looking at the popularity of Matt__C’s comment it seems reasonable to point out that the coordinates… don’t … Read more
Edit The suggestion I make here is deprecated in iOS 15. So now what? Well, if an app doesn’t have multiple windows of its own, I presume the accepted modern way would be to get the first of the app’s connectedScenes, coerce to a UIWindowScene, and take its first window. But that is almost exactly … Read more
The view’s window property is non-nil if a view is currently visible, so check the main view in the view controller: Invoking the view method causes the view to load (if it is not loaded) which is unnecessary and may be undesirable. It would be better to check first to see if it is already … Read more