遍历字典键值对 ，将一个字典加入另一个字典

    NSDictionary*dic =@{@"8":@"AAAA",

                              @"2":@"BBBBB",

                              @"3":@"CCCCCC",

                              @"1":@"FFFFF"};

    NSArray*arrKeys = [dicallKeys];

    for(inti =0; i < arrKeys.count; i++)

    {

        NSString*key = arrKeys[i];

           NSString*value = [dicvalueForKey:key];

        NSLog(@"%@ = %@",key,value);

    }

        NSLog(@"%zd",dic.count);

    // 2

    [dicenumerateKeysAndObjectsUsingBlock:^(idkey,idobj,BOOL*stop) {

       NSLog(@"key = %@ and obj = %@", key, obj);

    }];

将一个字典键值添加到另外一个字典中 关键字 setVlue

NSDictionary*dict=@{@"1":@"1",@"2":@"2"};

NSMutableDictionary*myHeader=[[NSMutableDictionaryalloc]init];

[myHeader setValue:@"8"forKey:@"8"];

[myHeader setValue:@"9"forKey:@"9"];

[myHeader setValue:@"10"forKey:@"10"];

[myHeader addEntriesFromDictionary:dict];

可以将 dict 字典的键值对添加到 myHeader 中