Flutter 重新加载启动 app

可以把整个应用包装成一个statfulwidget。想重新启动应用程序时，用拥有不同Key的子组件重新构建statefulwidget。

class RestartWidget extends StatefulWidget {
  const RestartWidget({super.key, required this.child});

  final Widget child;

  static void restartApp(BuildContext context) {
    context.findAncestorStateOfType<_RestartWidgetState>()?.restartApp();
  }

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

class _RestartWidgetState extends State<RestartWidget> {
  Key key = UniqueKey();

  void restartApp() {
    setState(() {
      key = UniqueKey();
    });
  }

  @override
  Widget build(BuildContext context) {
    return KeyedSubtree(
      key: key,
      child: widget.child,
    );
  }
}

void main() async {
  runApp(
    const RestartWidget(
      child: MyApp(),
    ),
  );
}