編碼規範：
Coding Guidelines for Cocoa
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html#//apple_ref/doc/uid/20001281-1001751-BBCFECGB
禪與 Objective-C 編程藝術 （Zen and the Art of the Objective-C Craftsmanship 中文翻譯）
https://github.com/oa414/objc-zen-book-cn#rd?sukey=fc78a68049a14bb293b25b3918ff446003ef85718caf5d10e5dd0db662a4aad87b42efe4553b334ea90cdd8fd3506f83
https://github.com/QianKaiLu/Objective-C-Coding-Guidelines-In-Chinese?sukey=fc78a68049a14bb2dbe1440f164c296da3da89d1aff2cfed5b901a266218083c15a9ac5143cb733c7df782c3505aac75