AFNetworking怎么post x-www-form-urlencoded类型的数据

AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];

    manager.requestSerializer = [AFHTTPRequestSerializer serializer];

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

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", @"text/plain",nil];

    [manager POST:urlStr parameters:dict progress:^(NSProgress * _Nonnull uploadProgress) {

        

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

       

    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

        

        

    }];