如何使用NavigatorObserver更新ChangeNotifier

import 'package:flutter/foundation.dart';

class MyNotifier extends ChangeNotifier {
  // 定义需要管理的状态和相应的操作方法
  // ...
}

import 'package:flutter/material.dart';

class MyPage extends StatefulWidget {
  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> with NavigatorObserver {
  MyNotifier _notifier = MyNotifier();

  @override
  void initState() {
    super.initState();
    // 添加NavigatorObserver监听
    WidgetsBinding.instance!.addObserver(this);
  }

  @override
  void dispose() {
    // 移除NavigatorObserver监听
    WidgetsBinding.instance!.removeObserver(this);
    super.dispose();
  }

  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    // 页面路由变化时，更新ChangeNotifier
    _notifier.notifyListeners();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // 页面内容
      // ...
    );
  }
}

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<MyNotifier>(
      create: (_) => MyNotifier(),
      child: Consumer<MyNotifier>(
        builder: (context, notifier, _) {
          // 根据ChangeNotifier的变化更新UI
          return Text(notifier.someValue.toString());
        },
      ),
    );
  }
}