// 请求数据类实例化

AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];

// 可变request实例化

  NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:str]];

// 设置 请求方法我POST 

    request.HTTPMethod = @"POST";

    // 设置请求头 的 Content-Type格式

    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    NSString *postStr = [NSString stringWithFormat:@"content=%@",mdic];

    [request setHTTPBody:[postStr dataUsingEncoding:NSUTF8StringEncoding]];

   // 请求数据

    NSURLSessionDataTask * dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {

        NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;

        NSInteger responseStatusCode = [httpResponse statusCode];

//        NSLog(@"---------%@ %ld %@", httpResponse, (long)responseStatusCode ,responseObject);

        if (responseStatusCode == 200) {

            // 成功后的处理

//            NSLog(@"%@", responseObject);

//            NSLog(@"返回数据为！！！%@" , responseObject);

            successResponse(responseObject);

        }else {

            // 失败后的处理

            //                                                                  NSLog(@"%@", error);

            if(error.code==-1009){

                NSDictionary *codeDic=@{@"errCode":@"-1009",@"msg":@"网络未连接!"};

                successResponse(codeDic);

            }else{

                NSDictionary *codeDic=@{@"errCode":APPERROR,@"msg":@"未知错误!"};

                successResponse(codeDic);

            }

        }

    }];

    [dataTask resume];

AFNetworking application/x-www-form-urlencoded 数据请求方式