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    <p>I struggled with this one for a long time, and one of my issues is listed <a href="https://stackoverflow.com/questions/5913511/uiviewcontroller-resizing-itself-between-viewwillappear-and-viewdidappear">here</a>, I'm not sure if you have had that problem. But here's what I would recommend if it must work with iOS 4.</p> <p>Firstly, create a new <code>NavigationController</code> class. This is where we'll do all the dirty work--other classes will be able to "cleanly" call instance methods like <code>pushViewController:</code> and such. In your <code>.h</code>:</p> <pre><code>@interface NavigationController : UIViewController { NSMutableArray *childViewControllers; UIViewController *currentViewController; } - (void)transitionFromViewController:(UIViewController *)fromViewController toViewController:(UIViewController *)toViewController duration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL))completion; - (void)addChildViewController:(UIViewController *)childController; - (void)removeChildViewController:(UIViewController *)childController; </code></pre> <p>The child view controllers array will serve as a store for all the view controllers in our stack. We would automatically forward all rotation and resizing code from the <code>NavigationController</code>'s view to the <code>currentController</code>.</p> <p>Now, in our implementation:</p> <pre><code>- (void)transitionFromViewController:(UIViewController *)fromViewController toViewController:(UIViewController *)toViewController duration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL))completion { currentViewController = [toViewController retain]; // Put any auto- and manual-resizing handling code here [UIView animateWithDuration:duration animations:animations completion:completion]; [fromViewController.view removeFromSuperview]; } - (void)addChildViewController:(UIViewController *)childController { [childViewControllers addObject:childController]; } - (void)removeChildViewController:(UIViewController *)childController { [childViewControllers removeObject:childController]; } </code></pre> <p>Now you can implement your own custom <code>pushViewController:</code>, <code>popViewController</code> and such, using these method calls.</p> <p>Good luck, and I hope this helps!</p>
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    1. POAnimate change of view controllers without using navigation controller stack, subviews or modal controllers?
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    1. COAgain we must resort to adding view controllers as sub-views of existing view controllers. Granted, this is what the existing Navigation Controller does, but it means we basically have to rewrite it and all it's methods. In reality, we should avoid having to distribute viewWillAppear and similar methods. I'm beginning to think there is no clean way of doing this. However, I do thank you for taking the time and effort!
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    2. COI think, with this system of adding and removing view controllers as needed, this solution prevents you from having to forward those methods.
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    3. COAre you sure? I used to swap view controllers in a similar manner before and I always had to forward messages. Can you confirm otherwise?
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