iOS笔记之NSDictionary与NSMutableDictionary

正文

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NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:
                              @"xbyvalue1", @"xbykey1",
                              @"xbyvalue2", @"xbykey2",
                              @"xbyvalue3", @"xbykey3",
                              @"xbyvalue4", @"xbykey4",
                              nil];

根据现有的字典创建字典

NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];

根据key获取value

NSDictionary *dic =[dic3 objectForKey:@"key3"];
        

获取字典数量

NSInteger count = dic3.count;

所有的键集合

NSArray *keys = [dic3 allKeys];        

所有值集合

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