我正在制作我的第一个TODO应用程序，在用户写了一个新的笔记后，我正在努力更新我的应用程序。我希望在用户从NewNotePage单击保存和Navigator.pop()后更新HomePage的子类（HomeBody）。
这是我的父类HomePage表单，我想更新子类，子类是HomeBody作为脚手架的主体。

class HomePage extends StatefulWidget {
  const HomePage({super.key});
  static const String routeName = '/home';

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    ...
      // ----------------------Center-------------------------------
      body: const HomeBody(),
      // ----------------------BOTTOM--------------------------------
      bottomNavigationBar: const HomeBottomAppBar(),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.pushNamed(context, NewNotePage.routeName).then((_) {
            setState(() {});
            print("Action after Navigator.pop()");
          });
        },
        child: const Icon(Icons.create),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
    );
  }
}

字符串
子类看起来像这样，我想更新这个类，以显示用户所做的新注解。

class HomeBody extends StatefulWidget {
  const HomeBody({super.key});

  @override
  State<HomeBody> createState() => _HomeBodyState();
}

class _HomeBodyState extends State<HomeBody> {
  @override
  Widget build(BuildContext context) {
    return ListView(
      padding: const EdgeInsets.all(5),
      children: <Widget>[
        if (notesList.isNotEmpty)
          for (var note in notesList)
            NoteWidget(
                note: note,
                onDeletePressed: () {
                  DataDB.delete(note: note, context: context).then((value) {
                    setState(() {});
                  });
                })
        else ...[
          Container(
            alignment:
                AlignmentGeometry.lerp(Alignment.center, Alignment.center, 0),
            child: Text(
              "Add your first note",
              style: Theme.of(context)
                  .textTheme
                  .titleMedium!
                  .copyWith(color: Colors.black.withOpacity(0.5)),
            ),
          ),
        ],
      ],
    );
  }
}

型
这里是NewNotePage的状态，用户记录并保存它，然后页面弹出到HomePage。

@override
  Widget build(BuildContext context) {
    return Scaffold(
      ...
      // ----------------------Center-------------------------------
      body: NewNoteBody(controller: contentController),
      // ----------------------BOTTOM--------------------------------
      bottomNavigationBar: const BottomAppBar(
        notchMargin: 4,
        clipBehavior: Clip.antiAlias,
      ),
      floatingActionButton: FloatingActionButton(
        tooltip: 'save',
        onPressed: () async {
          if (titleController.text.isNotEmpty ||
              contentController.text.isNotEmpty) {
            NoteModel note = NoteModel(
              title: titleController.text,
              content: contentController.text,
            );
            await DataDB.addNote(note: note).then((value) {
              Navigator.pop(context);
            });
          } else {
            Navigator.pop(context);
          }
        },
        child: const Icon(
          Icons.done_rounded,
          size: 32,
        ),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.endDocked,
    );
  }

型