JSController 介绍
JSController 实现一组类用于简化构建游戏控制 UI 的方法：
- 完全采用 UIKit 编写
- All controls are both delegate based and/or pollable.
- D-Pad class with full 8 directions, background and direction images can be swapped out
- Push Button class with configurable background images
- Analogue stick class that uses a normalized -1.0 to 1.0 scale and supports inverted Y axis. Background and handle images can be swapped out.
- Can be used within Interface Builder, just drag a UIView onto your XIB and set it’s class as JSDPad, JSButton or JSAnalogueStick. You can set it’s delegate from within interface builder as well as its position and size.
