WWDC 2013 Summary : 226-HD Implementing Engaging UI on iOS

-> Custom Transition

-> UISnapshotting -> Improvement on  [CALayer renderInContext]

snapshotView : Fastest

drawViewHierarchyInRect : Faster

Making Blurred Background -> drawViewHierarchyInRect & applyLightEfftect

-> Custom Appearance  : self.window setTintColor

[UIImage resizableImageWithCapInsets]

minimum height - 44px

Focus & Intent!

Affirmative(positive) button -> right