如何在抖动中删除缓存的图像？

Question

我有一个用Dart编写的小部件，它应该使我能够更改渲染的图片。但是，当我在图像上执行longPress并选择另一张图像时，该图像永远不会更新。我想，这个问题与CACHE有某种联系，但我无法弄清楚。

我使用imageFile变量来存储文件位置。当我覆盖此文件时，我也希望窗口小部件的图片也发生变化，但它不是：（

请帮助！

import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

import 'package:image_picker/image_picker.dart';

import 'models/profile.dart';

class ImageWidget extends StatefulWidget {
    ImageWidget({this.index, this.path, this.mainProfile});

    final int index;
    final String path;
    final Profile mainProfile;

    @override
    _ImageWidgetState createState() {
      return _ImageWidgetState(index: index, path: path, mainProfile: mainProfile,);
    }
  }

class _ImageWidgetState extends State<ImageWidget> {
  _ImageWidgetState({this.index, this.path, this.mainProfile});

  final int index;
  final String path;
  final Profile mainProfile;
  File imageFile;

  Future<void> pickImage() async {
    void closeWindow(File file) async {
      File newFile;
      if (file != null) {
        newFile = await file.copy('$path/image${index}.png');

        setState(() {
          imageFile = newFile;
        });
      }

      Navigator.pop(context);
    }

    print("YEP!");

    showDialog(
      context: context,
      builder: (BuildContext context) {
        return SimpleDialog(
          title: Text("Modify picture"),
          children: <Widget>[
            SimpleDialogOption(
              onPressed: () async {
                final File file = await ImagePicker.pickImage(
                  source: ImageSource.gallery,
                );
                closeWindow(file);
              },
              child: const Text('Choose From Gallery'),
            ),
            SimpleDialogOption(
              onPressed: () async {
                final File file = await ImagePicker.pickImage(
                  source: ImageSource.camera,
                );
                closeWindow(file);
              },
              child: const Text('Take A New Picture'),
            ),
            SimpleDialogOption(
              onPressed: () async {
                mainProfile.images.removeAt(index);
                dispose();
                Navigator.pop(context);
              },
              child: const Text('Delete picture'),
            ),
          ]
        );
      }
    );
  }

  @override
  void initState() {
    imageFile = File('$path/image$index.png');
    super.initState();
  }

  @override Widget build(BuildContext context) {
    return GestureDetector(
      onLongPress: () => pickImage(),
      child: Container(
        width: MediaQuery.of(context).size.width,
        child: Image.file(
          imageFile,
          fit: BoxFit.cover,
        ),
      ),
    );
  }
}