AFNetWorking 3.0请求返回NSData类型数据解

if([responseObject isKindOfClass:[NSData class]]){
                // 将返回的值直接转化为 json 格式，然后再返回
                NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableLeaves error:nil];
                
                successBlockparams(dict);
            }
            else{
                
                successBlockparams(responseObject);
            }