NSNull, Nil, nil, NULL区别（OC）

参考：http://nshipster.com/nil/

直接给个表吧

SymbolValueMeaning
NULL (void *)0 literal null value for C pointers
nil (id)0 literal null value for Objective-C objects
Nil (Class)0 literal null value for Objective-C classes
NSNull [NSNull null] singleton object used to represent null
posted @ 2014-08-21 00:03  $walker  阅读(164)  评论(0)    收藏  举报