画布 1
iOS框架梳理
  图像
    Image I/O 从硬盘读写图像资源，多种格式
    vImage 图像操作的C编程风格的封装库，相比较于Quartz 2D和Core Image提供通用的图像操作方法，vImage更关注于
* Incorporating high-performance graphics into their applications
* Efficiently processing large images
* Real-time video processing software
* Scientific applications that require high-accuracy numerical calculations
* Getting consistent numerical results across platforms despite video card arithmetic inconsistencies
    Quarz 2D 2D渲染
    OpenGL ES / Metal 3D渲染
    Core Image 提供通用的图像处理方式，OC编程风格，内置非常多的过滤器
  语音
    AVFoundation 播放、录制、编辑音视频媒体
    Core Audio
    Core Media
    Core Animation
  视频