This Xcode project is a basic tutorial on getting started with Facebook's amazing Pop animation framework.
Run the app, tweak the variables, then try to create your own animation.
Video tutorial: https://www.youtube.com/watch?v=ErJ4FnPa_Qk
I originally created this animation for my App Hours, here is what it looks like in-context: http://youtu.be/yjSlhDrgTTU