1

我正在使用 AFJSONRequestOperation 来获取我的朋友列表。这是请求：

/// get friends
    NSString *str = [NSString stringWithFormat:@"https://api.vk.com/method/friends.get?fields=first_name,last_name&uid=%@&access_token=%@", user_id, secret];
    NSURL *url = [[NSURL alloc] initWithString:str];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {

NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:JSON
                                                           options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
                                                             error:&error];

                    if (! jsonData) {
                        self.friendsList.hidden = YES;
                        NSLog(@"Got an error: %@", error);
                    } else {
                        NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
                        NSLog(@"JSON: %@", jsonString);
                    }


    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];

NSLog 的输出如下所示：

"response" : [
{
  "user_id" : 3468700,
  "uid" : 3468700,
  "first_name" : "Юленька",
  "last_name" : "Калюжная",
  "online" : 0
},
{
  "user_id" : 3870082,
  "uid" : 3870082,
  "first_name" : "Михаил",
  "last_name" : "Халецкий",
  "online" : 0
},
{
  "user_id" : 4080134,
  "uid" : 4080134,
  "first_name" : "Мария",
  "last_name" : "Караваева",
  "online" : 0
},
{
  "user_id" : 4943555,
  "uid" : 4943555,
  "first_name" : "Юсёнок",
  "last_name" : "Ларченко",
  "online" : 0
},
{
  "user_id" : 5012692,
  "uid" : 5012692,
  "first_name" : "Вячеслав",
  "last_name" : "Тарабушкин",
  "online" : 0
},
{
  "user_id" : 5036666,
  "uid" : 5036666,
  "first_name" : "Владислав",
  "last_name" : "Растегаев",
  "online" : 0
}

问题是json响应是一条线，我无法解决大量的元素。有没有机会将json响应变成一个巨大的？我试过更换

 NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]; for 

 NSArray *ar = [[NSArray alloc] initWithObjects:jsonData, nil];

结果 NSLog 显示如下：

 (<7b0a2020 22726573 706f6e73 6522203a 205b0a20 2020207b 0a202020 20202022 75736572          5f696422 203a2033 34363837 30302c0a 20202020 20202275 69642220 3a203334 36383730 302c0a20 20202020 20226669 7273745f 6e616d65 22203a20 22d0aed0 bbd0b5d0 bdd18cd0 bad0b022 2c0a2020 20202020 226c6173 745f6e61 6d652220 3a2022d0 9ad0b0d0 bbd18ed0 b6d0bdd0 b0d18f22 2c0a2020 20202020 226f6e6c 696e6522 203a2030 0a202020 207d2c0a 20202020 7b0a2020 20202020 22757365 725f6964 22203a20 33383730 3038322c 0a202020 20202022 75696422 203a2033 38373030 38322c0a>)

我也试过这个变种：

  NSArray *dataDictionary = [NSJSONSerialization JSONObjectWithData:JSON options:0 error:&error];
  NSLog(@"%@", dataDictionary);

但应用程序倾向于关闭并告诉存在错误：[__NSCFDictionary bytes]: unrecognized selector sent to instance 0x7527ad0 任何帮助将不胜感激。提前致谢

4

2 回答 2

0

您需要检查JSON对象是NSArray对象类型还是对象NSDictionary类型，如下所示：

if([JSON isKindOfClass:[NSDictionary class]]) {
    // JSON object is NSDictionary type of object.
} else if([JSON isKindOfClass:[NSArray class]]) {
   // JSON object is NSArray type of object.
}
于 2013-09-08T09:44:45.213 回答
0

当您使用框架为您完成AFJSONRequestOperation的解析时JSON，您只需要知道/检查结果是否为NSArray或NSDictionary然后适当地访问它。

于 2013-09-07T16:56:36.253 回答