1. 扫码

iOS上实现扫码的方法有ZBar,ZXing,AVFoundation

1.1. AVFoundation

cocoa自带库，无论在扫描灵敏度和性能上来说都是最优的，前提是iOS7之后才能用

1.2. Reference

• http://blog.cnbluebox.com/blog/2014/08/26/ioser-wei-ma-sao-miao/
• https://github.com/shaojiankui/Scanner