ios问题集
摘要：
1.nil,NULL,NSNull的区别nil: A null pointer to an Objective-C object.
( #define nil ((id)0) ) Nil: A null pointer to an Objective-C class. NULL: A null pointer to anything else. ( #define NULL ((void *)0) )
NSNull: A class defines a singleton object used to represent null values in collection object... 阅读全文
posted @ 2013-12-23 21:59 Satch.mo 阅读(150) 评论(0) 推荐(0) 编辑
