With iOS 7 you can easily create custom view controller transitions that can be used in a range of contexts (push, pop, modal …). This project provides a library of custom animations which can be dropped directly into your project. It also has a number of 'interaction controllers' which can be used with any of the custom animations in order to make your transitions interactive.
The library currently contains the following animations, which can be made interactive with either a swipe or pinch gesture.
Via Vincent Demay