标签：ios nil nsnumber objective-c
#define OBJ_IS_NIL(s) (s==nil || [s isKindOfClass:[NSNull class]])
#define Number_IS_NIL(s) (s==nil || [s isKindOfClass:[NSValue class]])
标签：ios nil nsnumber objective-c
原文地址：http://blog.csdn.net/doubleuto/article/details/41594441
