如何在导航器中使用ChangeNotifier

dependencies:
  flutter:
    sdk: flutter
  provider: ^5.0.0

import 'package:flutter/foundation.dart';

class MyDataModel extends ChangeNotifier {
  int _counter = 0;

  int get counter => _counter;

  void incrementCounter() {
    _counter++;
    notifyListeners();
  }
}

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

void main() {
  runApp(
    ChangeNotifierProvider(
      create: (context) => MyDataModel(),
      child: MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My App',
      home: MyHomePage(),
    );
  }
}

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

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final myDataModel = Provider.of<MyDataModel>(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('My Home Page'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Counter: ${myDataModel.counter}',
              style: TextStyle(fontSize: 24),
            ),
            ElevatedButton(
              onPressed: () {
                myDataModel.incrementCounter();
              },
              child: Text('Increment'),
            ),
          ],
        ),
      ),
    );
  }
}