leo questions

• Use UIView animation to implement kCATransitionPush from CATransition
• CALayer drops shadow to each sublayer, how to remove?
• how to fake the built-in application switch animation?
• How to imitate a red gloss delete button in iphone/ipad contact?
• NSNumber's copy is not allocating new memory
• why "present modal view controller"?
• Having problem understanding CGPathAddArc

leo answers