Flutter Image如何在下一个构建中从上一个构建中停止的特定帧开始一个gif

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'dart:typed_data';

class GifPlayer extends StatefulWidget {
  @override
  _GifPlayerState createState() => _GifPlayerState();
}

class _GifPlayerState extends State<GifPlayer> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Uint8List _gifBytes;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(vsync: this);
    _loadGif();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  Future<void> _loadGif() async {
    final gifData = await rootBundle.load('assets/your_gif.gif');
    setState(() {
      _gifBytes = gifData.buffer.asUint8List();
    });
  }

  @override
  Widget build(BuildContext context) {
    return _gifBytes != null
        ? Image.memory(
            _gifBytes,
            frameBuilder: (BuildContext context, Widget child, int frame, bool wasSynchronouslyLoaded) {
              if (wasSynchronouslyLoaded) {
                return child;
              }
              _controller.value = frame / _controller.upperBound;
              return AnimatedBuilder(
                animation: _controller,
                builder: (BuildContext context, Widget child) {
                  return child;
                },
                child: child,
              );
            },
          )
        : CircularProgressIndicator();
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      body: Center(
        child: GifPlayer(),
      ),
    ),
  ));
}