how to get my UIWindow using UIApplication?

Question

I have only one window and I tried

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

but this returned nil.

I also

Answer 1

Your application's key window isn't set until [window makeKeyAndVisible] gets called in your app delegate. Your UIViewController is probably being loaded from a NIB before this call. This explains why keyWindow is returning nil.

Luckily, your view controller doesn't need to go through UIApplication to get the window. You can just do:

UIWindow *mWindow = self.view.window;