UIViewController transition - objective-c

Question

I have UIViewControllers A and B, they are allocated in AppDelegate. I need to apply transition to them. How to transit them without reallocating a

Answer 1

I found solution for my problem. This code works on iOS 4.x

[UIView beginAnimations:@"transition" context:nil];
[UIView setAnimationDuration:1.0];

[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown 
             forView:self.navigationController.view 
               cache:NO];

[self.navigationController 
pushViewController:self.alternateView animated:NO];

[UIView commitAnimations];