Flutter 重新加载子小部件的初始状态答案

【问题标题】：Flutter reload init state of a child widgetFlutter 重新加载子小部件的初始状态
【发布时间】：2020-11-30 15:13:07
【问题描述】：

我尝试在 Navigator.pop 上重新加载我的页面，然后我执行以下操作：

Flutter - How to get notified when the page I pushed was popped by back button?

但是当我在我的父页面中时：

refresh() async{
  await _immagineBloc.getNomiImmagini(_deviceName);
  setState(() {
    _index = 0;
  });
}

这不会在 selectPhoto 初始化状态中返回：

Widget build(BuildContext context) {
  _tabs = getTabs(2);
  return StreamBuilder(
        stream:  _immagineBloc.immaginiName,
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            return new MaterialApp(
                home: DefaultTabController(
                  length: 2,
                  child: Scaffold(
                    appBar: AppBar(
                        centerTitle: true,
                        title: Text('App Drive'),
                        backgroundColor: Colors.blueAccent,
                        bottom: TabBar(
                            isScrollable: false,
                            indicatorColor: Colors.white,
                            onTap: (int index) {
                              _index = index;
                              setIndex(index);
                            },
                            tabs: _tabs)
                    ),
                    body: _index  == 0 ? selectPhoto(snapshot, refresh) : ImageOnServer(snapshot, _deviceName),
                  ),

如何重新进入selectPhoto里面的init状态？

刷新方法调用后我想重新进入的类的初始化状态：

 class selectPhoto extends StatefulWidget {
 @override
 final Function() notifyParent;
 selectPhoto(AsyncSnapshot<dynamic> snapshot, @required 
 this.notifyParent){
   _snapshot = snapshot;
 }
 AsyncSnapshot<dynamic> _snapshot;
 _selectPhotoState  createState() => _selectPhotoState (_snapshot);
 }

 class _selectPhotoState extends State<selectPhoto> {
    _selectPhotoState(AsyncSnapshot<dynamic> snapshot) {
    _snapshot = snapshot;
    @override
    void initState() {
       super.initState();
         _fetchNewMedia(_snapshot); // i wan't to re enter here on reload method enter
       }
    }

在构建中我有：

 onPressed: () =>
                  Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => photoSelection(_imagesIds, _deviceName, _imageNames))
                  ).then((val) {
                    if (val == 'pop') {
                      widget.notifyParent();
                      };
                  })

请帮助我！

【问题讨论】：

标签： flutter

【解决方案1】：

将此方法添加到 selectPhoto 类解决：

void _reset() {
   Navigator.pushReplacement(
     context,
     PageRouteBuilder(
        transitionDuration: Duration.zero,
        pageBuilder: (_, __, ___) =>MyApp(),
     ),
   );
 }

并在里面调用：

 onPressed: () =>
              Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => photoSelection(_imagesIds, _deviceName, _imageNames))
              ).then((val) {
                if (val == 'pop') {
                  widget.notifyParent();
                  _reset();
                  };
              })

这会将我返回到我的父小部件

【讨论】：