AFNetworking multiple file uploads

NSURL *url1 = [[NSBundle mainBundle] URLForResource:@"06.jpg" withExtension:nil];
    NSURL *url2 = [[NSBundle mainBundle] URLForResource:@"01.jpg" withExtension:nil];

    [[AFHTTPRequestOperationManager manager] POST:@"http://127.0.0.1/php/upload/upload-m.php" parameters:@{@"username":@"zhangsan"} constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //上传文件
        [formData appendPartWithFileURL:url1 name:@"userfile[]" error:nil];
        [formData appendPartWithFileURL:url2 name:@"userfile[]" error:nil];

    } success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
        NSLog(@"%@",responseObject);
    } failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
        NSLog(@"%@",error);
    }];