Overlay a view over whole screen, when using UITabBarController?

Question

I want to overlay a HUD-style transparent graphic over the entire screen in a UITabBarController setup. The button to do this is in the first tab\'s screen (FirstViewController)

Answer 1

UIView *modal = [[UIView alloc] initWithFrame:self.view.window.frame];
[self.view.window addSubview:modal];

This might be the same as the [[UIApplication sharedApplication] keyWindow] mentioned above. But I like referencing it through the current view.