我看到人们通常这样初始化控制器，用initState()方法初始化它。

late VideoPlayerController _videoPlayerController;

 @override
  void initState() {
    super.initState();
    _videoPlayerController = VideoPlayerController.network(
        "https://assets.mixkit.co/videos/preview/mixkit-spinning-around-the-earth-29351-large.mp4");
  }

但后来我意识到如果我把控制器像这样放进去，不放initState()，只是把控制器放在变量后面，late放在变量前面，一切都很好，那有什么区别呢？

class _VideoDetailScreenState extends State<VideoDetailScreen> {
      
late VideoPlayerController _videoPlayerController = VideoPlayerController.network(
          "https://assets.mixkit.co/videos/preview/mixkit-spinning-around-the-earth-29351-large.mp4");