reference.md

# 参考文献

[Apple Coding Guidelines for Cocoa](https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html)

[Github objective-c-style-guide](https://github.com/github/objective-c-style-guide)

[Raywenderlich objective-c-style-guide](https://github.com/raywenderlich/objective-c-style-guide)

[Google Objective-C Style Guide](http://google-styleguide.googlecode.com/svn/trunk/objcguide.xml)

[纽约时报 移动团队 Objective-C 规范指南](https://github.com/NYTimes/objective-c-style-guide/blob/master/README_zh-Hans.md#%E5%91%BD%E5%90%8D)