how to get my UIWindow using UIApplication?

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I have only one window and I tried

UIWindow* mWindow = [[UIApplication sharedApplication] keyWindow];

but this returned nil.

I also tried:

UIWindow* mWindow = (UIWindow*)[[UIApplication sharedApplication].windows objectAtIndex:0];

But this raised an exception and the app closed, when I tried to print out

[[UIApplication sharedApplication].windows count]

It printed 0

Note: I am putting this in my only view controller's viewDidLoad method and this is completely a new iPad View Based Application so I changed nothing, just trying to get the window

Please help me to get this object

uiwindow uiapplication iphone
5 Answers

With iOS 13+ you should use:

if let currentScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
    let window = currentScene.keyWindow {
    // now window contains the active window
}
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