iPhone animaion, how to flip a coin (2 UIImageview)?

Assume there are 2 UIImageview s, the front and back images of a coin. How to animate the 2 UIImageviews开发者_Python百科 such that the face and the back is flipping (spinning) continuously? Thanks!

You're probably better off with OpenGL for this. But instead of two images from faces of a coin, if you're using Core Animation, you might think about animating one view from individual frames, where you have "snapshots" of a picture of a single coin in various stages of a coin flip.