AFNetworking返回_NSCFData对象而不是JSON

Question

我将以下消息发送到AFHTTPClient的实例.我希望成功块被发送一个Foundation对象(一个字典),但调试器告诉我JSON是一个_NSCFData对象. 关于SO的这个问题表明我需要将Accept标头设置为'application/json'.好吧,我正在这样做,但AFNetworking仍然没有在响应体中解码JSON.如果我使用NSJSONSerialization自己解码json,我会得到一个我期望的NSDictionary.我究竟做错了什么？

[client setDefaultHeader:@"Accept" value:@"application/json"];
[client postPath:@"/app/open_connection/"
  parameters:params
     success:^(AFHTTPRequestOperation *operation, id JSON) {
         NSLog(@"successful login! %@", [JSON valueForKeyPath:@"status"]);
     }
     failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"error opening connection");
         NSAlert *alert = [NSAlert alertWithError:error];
         [alert runModal];
     }
];

注意:我正在使用Django在Python中编写服务器.响应的内容类型是'application/json'

Answer 1

当您使用AFHTTPClientJSON API时,通常需要设置所有这三个设置:

httpClient.parameterEncoding = AFJSONParameterEncoding;
[httpClient setDefaultHeader:@"Accept" value:@"application/json"];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];

现在,当您使用客户端发出请求时,它将知道将响应解析为JSON.

[httpClient postPath:@"/app/open_connection/"
          parameters:params
             success:^(AFHTTPRequestOperation *operation, id response) {
                 NSLog(@"JSON! %@", response);
             }
             failure:^(AFHTTPRequestOperation *operation, NSError *error) {
             }];

这也是我发现的一个技巧.在NSError对象中,您可以解析它并检索错误消息(如果HTTP响应有JSON错误消息):

failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSDictionary *JSON =
    [NSJSONSerialization JSONObjectWithData: [error.localizedRecoverySuggestion dataUsingEncoding:NSUTF8StringEncoding]
                                    options: NSJSONReadingMutableContainers
                                      error:nil];
           failureCallback(JSON[@"message"]);
}

Answer 2

试试这个...我认为您的客户端设置可能有问题。

NSMutableURLRequest *request = [client requestWithMethod:@"POST" path:@"/app/open_connection/" parameters:params];

AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request 
    success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        NSLog(@"successful login! %@", [JSON valueForKeyPath:@"status"]);
    }
    failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"error opening connection");
        NSAlert *alert = [NSAlert alertWithError:error];
        [alert runModal];
}];
[operation start];