Changes

When gravity behavior is applied to a view, and in the absence of opposing behaviors, the view will immediately move in the direction of the specified gravity vector. In fact, as currently defined, the view will fall out of the bounds of the reference view and disappear. This can be prevented by setting up a collision behavior.

== Configuring Collision Behavior ==

== The UIDynamicItemBehavior Class ==

The UIDynamicItemBehavior class allows additional behavior characteristics to be defined that compliment a number of the above primitive behaviors. This class can, for example, be used to define the density, resistance and elasticity of dynamic items so that they do not move as far when subjected to an instantaneous push, or bounce to a greater extent when involved in a collision. Dynamic items also have the ability to rotate by default. In the event that rotation is not required for an item, this behavior can be turned off using a UIDynamicItemBehavior instance.

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