NSMutableDictionary添加数据时遇到的问题

//根据需求，我需要在网络请求后在数据源里面添加另外的一个参数[manager GET:@"http://mobile.pinlehuo.com/api.php?m=Wallet&a=bindcard&user_id=1101" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {     for (NSMutableDictionary *dic in responseObject[@"data"]) {          [dic setValue:@"YES" forKey:@"checked"];          [dataArray addObject:dic];      }  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {      NSLog(@"%@", error);  }]; //我按照上面的方法直接在遍历后往字典里面添加参数 会报这个错误 Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'在网上查了一下，说是因为2个字典的内存地址不一样照成的//下面我又初始化了一个字典,根据现有的字典创建字典 成功了 NSMutableDictionary *mutableItem;  for (NSDictionary *dic in responseObject[@"data"]) {    // NSLog(@"%@", dic);  mutableItem = [NSMutableDictionary dictionaryWithDictionary:dic]; [mutableItem setValue:@"YES" forKey:@"checked"]; [dataArray addObject:mutableItem]; }//下面附上一些NSDictionary内容来自http://blog.csdn.net/ms2146/article/details/8656787 //创建字典  NSDictionary *dic1 = [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];   NSLog(@"dic1 :%@", dic1);   //创建多个字典   NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:                                @"value1", @"key1",                                @"value2", @"key2",                                @"value3", @"key3",                                @"value4", @"key4",                                nil];   NSLog(@"dic2 :%@", dic2);  //根据现有的字典创建字典  NSDictionary *dic3 = [NSDictionary dictionaryWithDictionary:dic2];  NSLog(@"dic3 :%@", dic3);  //根据key获取value  NSLog(@"key3 value :%@", [dic3 objectForKey:@"key3"]);  //获取字典数量  NSLog(@"dic count :%d", dic3.count);  //所有的键集合  NSArray *keys = [dic3 allKeys];  NSLog(@"keys :%@", keys);  //所有值集合  NSArray *values = [dic3 allValues];  NSLog(@"values :%@", values);  NSMutableDictionary *mutableDic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:                                             @"mvalue1", @"mkey1",                                             @"mvalue2", @"mkey2", nil];  //添加现有的字典数据  [mutableDic addEntriesFromDictionary:dic3];  NSLog(@"mutableDic :%@",mutableDic);  //添加新的键值对象  [mutableDic setValue:@"set1" forKey:@"setKey1"];  NSLog(@"set value for key :%@",mutableDic);  //以新的字典数据覆盖旧的字典数据   [mutableDic setDictionary:dic2];   NSLog(@" set dictionary :%@",mutableDic);  //根据key删除value  [mutableDic removeObjectForKey:@"key1"];  NSLog(@"removeForkey :%@",mutableDic);  //快速遍历  for(id key in mutableDic) {  NSLog(@"key :%@  value :%@", key, [mutableDic objectForKey:key]);     }  //枚举遍历  NSEnumerator *enumerator = [mutableDic keyEnumerator];  id key = [enumerator nextObject];   while (key) {   NSLog(@"enumerator :%@", [mutableDic objectForKey:key]);  key = [enumerator nextObject];   }   //根据key数组删除元素   [mutableDic removeObjectsForKeys:keys];   NSLog(@"removeObjectsForKeys :%@",mutableDic); //删除所有元素         [mutableDic removeAllObjects];  NSLog(@"remove all :%@", mutableDic);