The webpage presents Brian Dunagan's post on Core Animation on the iPhone, discussing its critical contribution to the visual cues of Apple’s apps. He discusses developers’ ability to incorporate direct manipulation into their apps and provides an example of how he ported animation code from Mac to iPhone to simulate Mail’s moving message feature. The content also includes a technical explanation and code for icon animation.
bdunagan – Core Animation on the iPhone
http://www.bdunagan.com/2009/04/26/core-animation-on-the-iphone/