如何使用Flutter中的ChangeNotifier将变量数据放入类中？

import 'package:flutter/material.dart';

// 定义一个ChangeNotifier类
class Counter with ChangeNotifier {
  int _count = 0;

  int get count => _count;

  void increment() {
    _count++;
    notifyListeners(); // 通知监听者状态已改变
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => Counter(),
      child: MaterialApp(
        home: Scaffold(
          appBar: AppBar(title: Text('Counter Example')),
          body: CounterWidget(),
        ),
      ),
    );
  }
}

class CounterWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Consumer<Counter>(
        builder: (context, counter, child) => Text(
          'You have pushed the button this many times: ${counter.count}',
        ),
      ),
    );
  }
}