Pinch to reveal animations have showed up in a number of apps.
Krzysztof Zablocki who has created some excellent source code examples including the previously mentioned NSNotification And KVO Objective-C Categories For Automatic Observer Removal and SFGestureRecognizers library for easier gesture recognizers in Cocos2D.
Now Krzysztof has created an example showing how to create a pinch to reveal animation using UIKit that was inspired by the Boeing app.
Here’s a video showing the example code in action:
You can find the Boeing app on iTunes here.
A nice interactive effect for showing related image content.
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