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    <p>First add the QuartzCore library to your project and <code>#import &lt;QuartzCore/QuartzCore.h&gt;</code></p> <p>Every view has a <code>layer</code> property with sub-properties that are animatable. This is where you'll find all the really cool stuff when it comes to animation capabilities (I suggest reading up on the <code>CALayer</code> class properties you can set - it will blow your mind - dynamic soft drop shadows on any view?)</p> <p>Anyway, back on topic. To rotate your doors open in 3D, first position them as if they were closed, so with each door filling half the screen.</p> <p>Now set their <code>view.layer.anchorPoint</code> properties as follows</p> <pre><code>leftDoorView.layer.anchorPoint = CGPoint(0, 0.5); // hinge around the left edge rightDoorView.layer.anchorPoint = CGPoint(1.0, 0.5); // hinge around the right edge </code></pre> <p>Now apply the following animation</p> <pre><code>[UIView animateWithDuration:0.5 animations:^{ CATransform3D leftTransform = CATransform3DIdentity; leftTransform.m34 = -1.0f/500; //dark magic to set the 3D perspective leftTransform = CATransform3DRotate(leftTransform, M_PI_2, 0, 1, 0); //rotate 90 degrees about the Y axis leftDoorView.layer.transform = leftTransform; //do the same thing but mirrored for the right door, that probably just means using -M_PI_2 for the angle. If you don't know what PI is, Google "radians" }]; </code></pre> <p>And that should do it.</p> <p>DISCLAIMER: I've not actually tested this, so the angles may be backwards, and the perspective may be screwy, etc. but it should be a good start at least.</p> <p>UPDATE: Curiosity got the better of me. Here is fully working code (this assumes that the left and right doors are laid out in the closed position in the nib file):</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; leftDoorView.layer.anchorPoint = CGPointMake(0, 0.5); // hinge around the left edge leftDoorView.center = CGPointMake(0.0, self.view.bounds.size.height/2.0); //compensate for anchor offset rightDoorView.layer.anchorPoint = CGPointMake(1.0, 0.5); // hinge around the right edge rightDoorView.center = CGPointMake(self.view.bounds.size.width,self.view.bounds.size.height/2.0); //compensate for anchor offset } - (IBAction)open { CATransform3D transform = CATransform3DIdentity; transform.m34 = -1.0f/500; leftDoorView.layer.transform = transform; rightDoorView.layer.transform = transform; [UIView animateWithDuration:0.5 animations:^{ leftDoorView.layer.transform = CATransform3DRotate(transform, M_PI_2, 0, 1, 0); rightDoorView.layer.transform = CATransform3DRotate(transform, -M_PI_2, 0, 1, 0); }]; } - (IBAction)close { [UIView animateWithDuration:0.5 animations:^{ CATransform3D transform = CATransform3DIdentity; transform.m34 = -1.0f/500; leftDoorView.layer.transform = transform; rightDoorView.layer.transform = transform; }]; } </code></pre>
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    1. POHow to animate UIImageViews like hatch doors opening
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    1. CO+1 for *dark magic to set the 3D perspective*
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    2. CO"dark magic" sounded better than "I don't feel like explaining matrices right now" ;-)
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    3. COActually, I should have said "no one can be told what The Matrix is..."
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