详细了介绍了ios系统下面的核心图像技术

利用AVFoundation做的相机的封装，支持扩展功能，有单例模式和普通的方式两种方便开发者调用，该demo主要用于学习AVFoundation。-Take advantage of the the AVFoundation camera package do, support extended functionality, both cases of single-mode and ordinary way to facilitate the development of call, the