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    <p>I just managed to get sth. like this to work using CoreAnimation / QuartzCore Framework... be sure to</p> <pre><code>#import &lt;QuartzCore/QuartzCore.h&gt; </code></pre> <p>when you want to animate, use CATransform3Dand the poorly documented CATransform3D.m34 property. this will do the <strong>first half</strong> of the animation (assuming 200x200&lt;->450x450 with 180° rotation):</p> <pre><code>[UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDelegate:self]; CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity; rotationAndPerspectiveTransform.m34 = 1.0 / -1000; // this turns on perspective! rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, 90.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f); someView.layer.transform = rotationAndPerspectiveTransform; someView.bounds = CGRectMake(0, 0, 325, 325); [UIView commitAnimations]; </code></pre> <p>for the <strong>second half</strong> of the animation, you have to add/remove your view to the hierarchy. this example shows hiding/showing of a view that already exists as a subview of <code>someView</code>, it also makes use of a <code>BOOL isUp</code> instance variable (the first half of the aniation is independent of the isUp-flag!)</p> <pre><code>- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag { if (flag) { if (isUp) { someSubView.hidden = YES; // hide subview [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; CATransform3D rotationAndPerspectiveTransform = CATransform3DRotate(someView.layer.transform, -90.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f); someView.layer.transform = rotationAndPerspectiveTransform; someView.bounds = CGRectMake(0, 0, 200, 200); [UIView commitAnimations]; isUp = NO; } else { someSubView.hidden = NO; // Show subview [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.5]; [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; CATransform3D rotationAndPerspectiveTransform = CATransform3DRotate(someView.layer.transform, 90.0f * M_PI / 180.0f, 0.0f, 1.0f, 0.0f); someView.layer.transform = rotationAndPerspectiveTransform; someView.bounds = CGRectMake(0, 0, 450, 450); [UIView commitAnimations]; isUp = YES; } } } </code></pre> <p>one last thing: everything in your view will appear mirrored, it might not be the ideal solution, but mirroring back by applying a <code>CGAffineTransform</code> to the subview does the trick:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; someSubView.transform = CGAffineTransformMakeScale(-1, 1); isUp = NO; } </code></pre> <p>i'm alredy a month late with this solution but i hope it helped someone :)</p> <p>i first tried using the animateWithDuration:animations:completion: block-based API but that turned out to lag heavily (no smooth first/second-half animaiton even without touching subviews).</p>
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    1. POanimated popup view similar to one in Ipad music folder
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    1. COthanks for the answer.. I tried out your code but it is not having any effect for me.. would you be able to explain to me what someView, someSubView and greenView is? I think someView would be my [self.view], my someSubView would be my subview.. but what is greenView?
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    2. COwhen i apply the "first half" animation code u posted to my [self.view], the effect it gives is a imploding effect.. is that what it is?
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    3. COsry greenView was a relict of my sample code i used for this post. you can have a look at my test project for this animation - just uploaded it :) [http://cl.ly/3y0c280W1Z1t3G2R0h43](http://cl.ly/3y0c280W1Z1t3G2R0h43)
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