In-Depth UIDynamicAnimator and UIDynamicAnimatorDelegate
The beginning of this chapter introduced UIDynamicAnimator, and the samples have all used addBehavior; however, this class has much more power that can be leveraged. In addition to adding dynamic effects, they can also be removed either one at a time or as a group using removeBehavior: and removeAllBehaviors. To get a list of all behaviors currently attached to a UIDynamicAnimator, the behaviors property can be used to return an array of behaviors.
It is also possible not only to poll whether the animator is running using the running property but also to determine the length of time using elapsedTime. The UIDynamicAnimator also has an associated delegate UIDynamicAnimatorDelegate. The ...
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