Understanding UIKit Rendering 

Session 121 WWDC 2011

UIKit has strong ties to Core Animation, and an understanding of this relationship can provide important insight into the behavior and performance of your UIKit application. We’ll walk through the fundamentals of UIView and CALayer geometry, convert a pure Core Animation application to use UIKit, and explore some tools Core Animation offers to enhance your application’s appearance and performance. Learn various techniques to provide optimal edge anti-aliasing, group opacity, clipping, shadows and more.

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