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    <p>If you review <a href="https://developer.apple.com/library/mac/#documentation/GraphicsImaging/Reference/CAAnimationGroup_class/Introduction/Introduction.html" rel="nofollow">the documentation</a>, you will note that <code>CAAnimationGroup</code> inherits from <code>CAAnimation</code>, and that <code>CAAnimation</code> can only be assigned to one <code>CALayer</code>. It's intent is really to make it easy to create and manage multiple animations you wish to apply to a <code>CALayer</code> at the same time, not to manager animations for multiple <code>CALayer</code> objects. </p> <p>To handle the sequencing of different animations between different <code>CALayer</code> or <code>UIView</code>objects, a technique I use is to create an <code>NSOperation</code> for each object/animation, then throw them into a <code>NSOperationQueue</code> to manage the sequencing. This is a bit complicated as you have to use the animation completion callback to tell the <code>NSOperation</code> it is finished, but if you write a good animation management subclass of <code>NSOperation</code>, it can be rather convenient and allow you to create sophisticated sequencing paths. The low-rent way of accomplishing the sequencing goal is to simply set the <code>beginTime</code> property on your <code>CAAnimation</code> object (which comes from it's adoption of the <code>CAMediaTiming</code> protocol) as appropriate to get the timing you want.</p> <p>With that said, I am going to point you to some code that I wrote and open-sourced to solve the exact same use case you describe. You may find it <a href="https://github.com/michaelkamprath/iPhoneMK/tree/master/Views/MKSoundCoordinatedAnimationView" rel="nofollow">on github here</a> (same code included). I will add the following notes:</p> <ul> <li>My animation management code allow your to define your animation in a plist by identifying the sequence and timing of image changes, scale changes, position changes, etc. It's actually pretty convenient and cleaner to adjust your animation in a plist file rather than in code (which is why I wrote this).</li> <li>If the user is not expected to interact with the subviews you creating, it's actually much better (less overhead) to create layer objects that are added as sub-layers to your hosting view's layer. </li> </ul>
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    1. POSequence animation using CAAnimationGroup
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    1. COI will look into that it seems a really interesting approach
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