iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK

Implementing UIKit Dynamics

Creating a new animation and attaching it to a view is accomplished using two lines of code. In this example self.view is now set up to use UIKit Dynamic behavior. Each specific dynamic item must be added to the animator using the addBehavior: method.

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UIDynamicAnimator *animator = [[UIDynamicAnimator alloc]initWithReferenceView:self.view];[animator addBehavior:aDynamicBehavior];

Each UIDynamicAnimator is independent and multiple animators can be run at the same time. For an animator to continue to run, a reference to it must be kept valid. When all items associated with an animator are at rest, the animator is not executing any calculations and will pause; however, best practices recommend ...