颤抖地将文件传递给孩子

Question

我正在尝试将文件imageFile从父对象传递给子窗口小部件以使用裁切器功能，但无法让孩子识别它，我错过了一步吗？

    class ProfileHome extends StatefulWidget {
      @override
      _ProfileHomeState createState() => _ProfileHomeState();
    }

    class _ProfileHomeState extends State<ProfileHome> {


      File imageFile;

      Future<void> _pickImage(ImageSource source) async {
        File selected = await ImagePicker.pickImage(source: source);
        setState(() {
          imageFile = selected;
        });
      }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
  body: Column(
    children: <Widget>[
     ProfilePhoto(
          imageFile: imageFile,)

儿童小工具

class ProfilePhoto extends StatefulWidget {
  File imageFile;
  ProfilePhoto({this.imageFile});

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

class _ProfilePhotoState extends State<ProfilePhoto> {
  Future<void> _cropImage() async {
    File cropped = await ImageCropper.cropImage(sourcePath: imageFile.path);
    setState(() {
      imageFile = cropped ?? imageFile;
    });
  }