Bug描述：在iOS系统中使用VideoPlayerController.file 初始化VideoPlayerController时一直不成功，无法正确播放视频

报错信息：如下

[+4508 ms] flutter: error:Bad state: Future already completed;
[        ] error:#0      _AsyncCompleter.complete (dart:async/future_impl.dart:35:31)
[        ] #1      VideoPlayerController.initialize (package:video_player/video_player.dart:365:25)
[        ] <asynchronous suspension>
[        ] #2      ChewieController._initialize (package:chewie/src/chewie_player.dart:546:7)
[        ] <asynchronous suspension>

出错代码：

 void onInit() async{
    File videoFile=File(videoBody.localPath);//videoBody.localPath 为String类型
    bool exist=videoFile.existsSync();
    videoController=VideoPlayerController.file(videoFile);
    videoController.initialize();
    chewieController=ChewieController(
      videoPlayerController: videoController,
      autoPlay: true,
      showControls: true,
      autoInitialize: false,
      looping: false,
      zoomAndPan: true,
      placeholder:   Container( color: Colors.black87,),

    );
    super.onInit();
  }

修改方法：使用Uri.encodeFull()方法包裹字符串类型的path路径即可。

File videoFile=File(Uri.encodeFull(videoBody.localPath))

参考：github文章