只適用於POST的網絡請求

• (void) networkManager : (NSString *)urlString
  parameter: (NSDictionary *)paraDic
  success:(void(^)(id obj)) success
  fail:(void(^)(NSError *error))fail
  {
  // NSURLSession 配置
  NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
  //創建 sessionManager
  AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
  //創建請求
  NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@”POST” URLString:urlString parameters:paraDic constructingBodyWithBlock:nil error:nil];
  //創建請求任務
  NSURLSessionDataTask dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {
  //如果有 error , 請求失敗
  //反之, 請求成功
  if (error) {
  fail(error);
  } else {
  success(responseObject);
  }
  }];
  //開啓任務
  [dataTask resume];
  }