1. Coding Guidelines for Cocoa https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html#//apple_ref/doc/uid/10000146-SW1 https://www.cnblogs.com/clairvoyant/p/5340389.html 来源：https://www.cnblogs.com/javastart/p/12290863.html 标签 cocoachina
