iPhone "slide to unlock" animation

Posted by Russ on Stack Overflow See other posts from Stack Overflow or by Russ
Published on 2009-01-13T05:21:45Z Indexed on 2010/05/06 3:28 UTC
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cocoa-touch

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core-animation

Any ideas as to how Apple implemented the "slide to unlock" (also, "slide to power off" is another identical example) animation?

I thought about some sort of animating mask - but masking is not available on the iPhone OS for performance reasons.

Is there some private API effect (like SuckEffect) that they might have used? A spotlight type of effect? Some Core Animation thing?

Edit: It's definitely not a series of stills. I've seen examples of being edit a plist value or something and customize the string on jailbroken iphones.

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