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    <p>As the other poster said, sleep is the problem. Sleep freezes the main thread. Forget that sleep exists. Never use it. The only time sleep is EVER valid is on a secondary thread, when you want that thread to stop running for a period, and then only if you really really know what you are doing with concurrency (a very advanced topic)</p> <p>What you should do is rewrite your animation code to use animateWithDuration:animations:completion:</p> <p>Provide a completion block that invokes the next animation using a nested call to animateWithDuration:animations:completion:</p> <p>Each animation will run to the end, and then invoke the next one. </p> <p>BTW, you should look at AVAudioPlayer. It is more powerful than AudioServices, and easier to use. You just create an AVAudioPlayer and tell it to play. </p> <p>If you want a step in your animation to wait for a sound to compete, AVAudioPlayer takes a delegate that it will call once the sound is done playing. </p> <p><strong>Here's how I would suggest reworking your animation sequence:</strong></p> <p>Before you begin your animation sequence, set up an AVAudioPlayer and make your view controller it's delegate. </p> <p>Write an animateWithDuration:animations:completion call where the animations block does your fade in. </p> <p>In the completion block, start an AVAudioPlayer playing. </p> <p>In the AVAudioPlayer delegate method audioPlayerDidFinishPlaying:successfully:, invoke another animateWithDuration:animations:completion: method to fade your view out again.</p>
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    1. POCore Animation + Core Audio + sleep not happening in the order expected
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