flutter 重啓APP

記個筆記，該界面在main.dart中。

import 'package:flutter/material.dart';


void main() {
  runApp(MyApp());
//  if (Platform.isAndroid) {
//    //設置Android頭部的導航欄透明
//    SystemUiOverlayStyle systemUiOverlayStyle =
//        SystemUiOverlayStyle(statusBarColor: Colors.transparent);
//    SystemChrome.setSystemUIOverlayStyle(systemUiOverlayStyle);
//  }
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.

  @override
  Widget build(BuildContext context) {
    return RestartWidget(
      child: MaterialApp(
        theme: ThemeData(backgroundColor: Colors.white),
        home: Scaffold(
          resizeToAvoidBottomPadding: false,
          body: "需要展示的page",
        ),
      ),
    );
  }
}

///這個組件用來重新加載整個child Widget的。當我們需要重啓APP的時候，可以使用這個方案
///https://stackoverflow.com/questions/50115311/flutter-how-to-force-an-application-restart-in-production-mode
class RestartWidget extends StatefulWidget {
  final Widget child;

  RestartWidget({Key key, @required this.child})
      : assert(child != null),
        super(key: key);

  static restartApp(BuildContext context) {
    final _RestartWidgetState state =
        context.ancestorStateOfType(const TypeMatcher<_RestartWidgetState>());
    state.restartApp();
  }

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

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

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

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