Ios 将GCD与也进行异步调用的代码一起使用安全吗

我有一个为HTTP请求构建数据的应用程序，目前请求本身（使用AFNetworking）也是方法的一部分，该方法将由

dispatch\u async

包装。重构东西以便不包装AFNetworking调用是否更好

// expensive set up code then...
AFHTTPRequestOperation *requestOperation =
            [manager HTTPRequestOperationWithRequest:request
                                             success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                                 NSLog(@"response %@", responseObject);
                                                 success(responseObject);
                                             } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                                 NSLog(@"error %@", error);
                                                failure(error);
                    }];

    requestOperation.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingMutableContainers];

    [[NSOperationQueue mainQueue] addOperation:requestOperation];
    return requestOperation;

---

不管你叫它什么线。AFNetworking将在自己的队列上创建请求操作，并调用主队列上的完成处理程序