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    <p><strong><em>EDIT: New answer that works in any orientation.</em></strong> The original answer only works when the interface is in portrait orientation. This is b/c view transition animations that replace a view w/ a different view must occur with views at least a level below the first view added to the window (e.g. <code>window.rootViewController.view.anotherView</code>).</p> <p>I've implemented a simple container class I called <code>TransitionController</code>. You can find it at <a href="https://gist.github.com/1394947" rel="noreferrer">https://gist.github.com/1394947</a>.</p> <p>As an aside, I prefer the implementation in a separate class b/c it's easier to reuse. If you don't want that, you could simply implement the same logic directly in your app delegate eliminating the need for the <code>TransitionController</code> class. The logic you'd need would be the same however.</p> <p>Use it as follows:</p> <p><strong>In your app delegate</strong></p> <pre><code>// add a property for the TransitionController - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; MyViewController *vc = [[MyViewContoller alloc] init...]; self.transitionController = [[TransitionController alloc] initWithViewController:vc]; self.window.rootViewController = self.transitionController; [self.window makeKeyAndVisible]; return YES; } </code></pre> <p><strong>To transition to a new view controller from any view controller</strong></p> <pre><code>- (IBAction)flipToView { anotherViewController *vc = [[AnotherViewController alloc] init...]; MyAppDelegate *appDelegate = [UIApplication sharedApplication].delegate; [appDelegate.transitionController transitionToViewController:vc withOptions:UIViewAnimationOptionTransitionFlipFromRight]; } </code></pre> <p><strong><em>EDIT: Original Answer below - only works for portait orientation</em></strong></p> <p>I made the following assumptions for this example:</p> <ol> <li><p>You have a view controller assigned as the <code>rootViewController</code> of your window</p></li> <li><p>When you switch to a new view you want to replace the current viewController with the viewController owning the new view. At any time, only the current viewController is alive (e.g. alloc'ed).</p></li> </ol> <p>The code can be easily modified to work differently, the key point is the animated transition and the single view controller. Make sure you don't retain a view controller anywhere outside of assigning it to <code>window.rootViewController</code>.</p> <p><strong>Code to animate transition in app delegate</strong></p> <pre><code>- (void)transitionToViewController:(UIViewController *)viewController withTransition:(UIViewAnimationOptions)transition { [UIView transitionFromView:self.window.rootViewController.view toView:viewController.view duration:0.65f options:transition completion:^(BOOL finished){ self.window.rootViewController = viewController; }]; } </code></pre> <p><strong>Example use in a view controller</strong></p> <pre><code>- (IBAction)flipToNextView { AnotherViewController *anotherVC = [[AnotherVC alloc] init...]; MyAppDelegate *appDelegate = (MyAppDelegate *)[UIApplication sharedApplication].delegate; [appDelegate transitionToViewController:anotherVC withTransition:UIViewAnimationOptionTransitionFlipFromRight]; } </code></pre>
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    1. POAnimate change of view controllers without using navigation controller stack, subviews or modal controllers?
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    1. POAnimate change of view controllers without using navigation controller stack, subviews or modal controllers?
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    1. COYes, very nice! Not only does it do the trick, but it's a very simple and clean code example. Many thanks!
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    2. CODoesn't his cause problems in landscape for you? Also: does this trigger the willAppear and didAppear methods of the viewControllers?
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    3. COI know the appear calls are being done because I logged them. I also don't see why this would affect orientation changes. Can you elaborate why you think it would?
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