A number of UIKit.UIDynamicBehaviors are associated with a UIKit.UIDynamicAnimator, which is responsible for the overall context. Any given UIKit.UIDynamicBehavior is associated with some amount of UIKit.IUIDynamicItems (such as UIKit.UIViews and UIKit.UICollectionViewLayoutAttributes); most subclasses of UIKit.UIDynamicBehavior expose these in an Items property or application developers can retrieve them with UIDynamicAnimator.GetDynamicItems.

There are a number of predefined subclasses of UIKit.UIDynamicBehavior:

Subclass	Behavior
UIKit.UIAttachmentBehavior	Attachment: Specifies a dynamic connection between two UIKit.IUIDynamicItems or between a UIKit.IUIDynamicItem and a fixed point.
UIKit.UICollisionBehavior	Collision: Detects when the boundaries of a UIKit.IUIDynamicItem meet another boundary.
UIKit.UIGravityBehavior	Gravity: Accelerates the UIKit.IUIDynamicItem towards the bottom of the screen.
UIKit.UIDynamicItemBehavior	Animation: Specifies an animation configuration to apply to one or more UIKit.IUIDynamicItems.
UIKit.UIPushBehavior	Pushing: Applies a continuous or instantaneous force vector to a UIKit.IUIDynamicItem.
UIKit.UISnapBehavior	Snapping: Specifies a magnetism-like attraction between a UIKit.IUIDynamicItem and a fixed point. Includes a rebounding effect.