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A modified version of Apple's WWDC 2013 code sample, iOS-CollectionViewTransition

Collection View Transition

This sample illustrates how to create a custom transition when navigating between two collection views in a navigation hierarchy managed by a navigation controller.

The application has two view collection view controllers that display cells. You can transition from one to the other by tapping on an item. You can also use a pinch gesture, in which case you can control the speed of, and even reverse, the transition.