检查分类覆盖方法：https://github.com/DaidoujiChen/DaiMethodHelper
建议分类前面加上前缀，http://nshipster.cn/namespacing/
https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/CustomizingExistingClasses/CustomizingExistingClasses.html#//apple_ref/doc/uid/TP40011210-CH6-SW4