http://www.cocoachina.com/programmer/20150430/11679.html
http://blog.csdn.net/duxinfeng2010/article/details/8620901
http://blog.csdn.net/xyz_lmn/article/details/9312837
IOS --业余开发
原文：http://my.oschina.net/u/2312022/blog/503648
