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→Implementing UIKit Dynamics in an iOS 9 Application
1. Create an instance of the UIDynamicAnimator class to act as the dynamic animator and initialize it with a reference to the reference view.
2. Create and configure a dynamic behavior instance and assign to it the dynamic items on which the specified behavior is to be imposed.
3. Add the dynamic behavior instance to the dynamic animator.
4. Repeat from step 2 to create and add additional behaviors.
