NSDictionary和NSMutableDictionary good
摘要:
NSDictionary和NSMutableDictionary2010-12-20 09:14914人阅读评论(0)收藏举报2)NSNullNSNull大概是Cocoa里最简单的类了,只有一个方法+ (NSNull *) null;可以这样添加到集合中[contact setObject: [NSNull null]forKey: @"home fax machine"];访问时:id homefax;homefax = [contact objectForKey: @"home fax machine"];if (homefax == [NSNull 阅读全文
posted @ 2011-11-15 13:32 moonvan 阅读(522) 评论(0) 推荐(0) 编辑