如何下载视频然后在Flutter iOS中播放

Question

我有一个Flutter项目，我想从url下载视频，然后在iOS的应用程序中播放。

以下用于下载和获取路径的代码，但未在VideoPlayer中播放。

class Download extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'File Download',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'File Download With Progress'),
    );
  }
}

class MyHomePage extends StatefulWidget {

  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  bool downloading = false;
  String progress = '0';
  bool isDownloaded = false;
  String uri = 'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4';
  String filename = 'video.mp4';

  Future<void> downloadFile(uri, fileName) async {
    setState(() {
      downloading = true;
    });

  String savePath = await getFilePath(fileName);

  Dio dio = Dio();

  dio.download(
    uri,
    savePath,
    onReceiveProgress: (rcv, total) {
      print('received: ${rcv.toStringAsFixed(0)} out of total: ${total.toStringAsFixed(0)}');

      setState(() {
        progress = ((rcv / total) * 100).toStringAsFixed(0);
      });

      if (progress == '100') {
        setState(() {
          isDownloaded = true;
        });
      } else if (double.parse(progress) < 100) {}
    },
    deleteOnError: true,
  ).then((_) {
    setState(() {
      if (progress == '100') {
        isDownloaded = true;
      }

      downloading = false;
    });
  });
}

Future<String> getFilePath(uniqueFileName) async {
  String path = '';

  Directory dir = await getApplicationDocumentsDirectory();

  path = '${dir.path}/$uniqueFileName';

  print(path);
  return path;
}

@override
Widget build(BuildContext context) {
  print('build running');

  return Scaffold(
    appBar: AppBar(
      title: Text(widget.title),
    ),
    body: Center(
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('$progress%'),
            isDownloaded ? Text('File Downloaded! You can see your file in the application\'s directory') : Text('Click the FloatingActionButton to start Downloading!'),
          ],
        ),
      ),
    ),
    floatingActionButton: FloatingActionButton(
      child: Icon(Icons.play_arrow),
      onPressed: () async {
        downloadFile(uri, filename);
      }),
    );
  }
}

下载路径：/var/mobile/Containers/Data/Application/95AE9721-87D7-4FA8-9343-1B6D73B08FEE/Documents/video.mp4

我正在尝试搜索，但是找不到解决我问题的好方法。 谢谢