8. Core Animation
One of the best ways to polish a five-star user experience is to harness Core Animation. Animations can be simple and subtle, like hiding navigation bars—or they can take center stage as seen in the Mail app when a message is moved from one folder to another. Animations add to the user experience and help the user feel immersed in your app by hiding unnecessary UI elements or providing important feedback when data changes. What makes this possible is Core Animation, another Quartz technology built into the Media layer of iOS. As a developer you can either leverage the common animations built into UIKit, or import the Quartz Core framework and implement your own custom animations.
Getting Started with Core Animation
Core Animation ...
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