Drop It Demo

DropIt Demo shows dynamic animation and some feature in CoreMontion

Feature

1. Tap view to drop new UIView with same size, random color and random start point.
2. Each new UIView has gravity and collider behavior. So it will hit to the boundary of view and the center circle and booms off.
3. When the Animator stop animate, it wll remove the row has 10 dropView. Then animator start again.
4. Add CoreMotion to get real gravity. Changed dropView gravity to real gravity.