//1.创建字段,不可变的        NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:@"xiaozhe",@"name", nil];        NSLog(@"dic %@",dic);                //2.快捷创建方式        NSDictionary * dic2 = @{ @"one":@"1",@"two":@"2"};        NSLog(@"dic2 %@",dic2);                //3.字典中可以存任意数据类型        // 字典的顺序不是自然顺序        NSArray * array = @[@"one",@"two"];                NSDictionary * dic3 = @{                                @"one":@"1",                                @"num":[NSNumber numberWithInt:10],                                @"aaa":dic2,                                @"bbb":dic,                                @"ar1":array                                                                };                NSLog(@"dic3 %@",dic3);                //4.获得字典的长度        NSLog(@"count %ld",dic3.count);                //5.从字典中取值                NSString * str  = [dic3 objectForKey:@"one"];        NSLog(@"str %@",str);                NSDictionary * dicTmp = [dic3 objectForKey:@"aaa"];        NSLog(@"dicTmp %@",dicTmp);        NSArray * arrayTmp = [dic3 objectForKey:@"ar1"];        NSLog(@"arrayTmp %@",arrayTmp);                                        //6.遍历                //取出所有的key值        NSArray * allkeys = [dic3 allKeys];        NSLog(@"allkeys %@",allkeys);                for (int i = 0; i < allkeys.count; i++)        {            NSString * key = [allkeys objectAtIndex:i];                        //如果你的字典中存储的多种不同的类型,那么最好用id类型去接受它            id obj  = [dic3 objectForKey:key];            NSLog(@"obj %@",obj);        }            //2.枚举器                NSEnumerator * enumerator =  [dic3 objectEnumerator];                id value;        while (value =http://www.mamicode.com/ [enumerator nextObject]) {            NSLog(@"value %@",value);        }