How to get root view controller?

I need an instance of root view controller.

I tried those approaches:

UIViewController *rootViewController = (UIViewController*)[[[UIApplication sharedApplication] keyWindow] rootViewController];

Returns: null:

Also when I try to get an array of controllers:

NSArray *viewControllers = self.navigationController.viewControllers;

It returns only one controller, but it isn't my root view controller.

If I try to take from navigation controller:

UIViewController *root = (UIViewController*)[self.navigationController.viewControllers objectAtIndex:0];

Returns: null:

Any ideas why? What else could I try to get an instance of my root view controller?

Thanks.