View Controller Transitions Library is a collection of iOS7 animation controllers and interaction controllers, providing flip, fold and all kinds of other transitions. With iOS 7 you can easily create custom view controller transitions that can be used in a range of contexts (push, pop, modal, etc.) 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. Animation and interaction controllers are entirely independent, this means you can wire up any interaction controller with any animation controller, which is pretty awesome. When you indicate that a custom transition should be used, you provide an animation controller. This class performs the required animation, then informs the framework when it has completed.