在Widget的停用方法中使用provider方法

dependencies:
  flutter:
    sdk: flutter
  provider: ^5.0.0

import 'package:flutter/material.dart';

class MyDataModel extends ChangeNotifier {
  int _count = 0;

  int get count => _count;

  void increment() {
    _count++;
    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: 'Flutter Demo',
      home: MyWidget(),
    );
  }
}

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

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Consumer<MyDataModel>(
      builder: (context, dataModel, child) {
        return Scaffold(
          appBar: AppBar(
            title: Text('My Widget'),
          ),
          body: Center(
            child: Text('Count: ${dataModel.count}'),
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: () => dataModel.increment(),
            child: Icon(Icons.add),
          ),
        );
      },
    );
  }
}

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

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  @override
  void dispose() {
    Provider.of<MyDataModel>(context, listen: false).dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<MyDataModel>(
      builder: (context, dataModel, child) {
        return Scaffold(
          appBar: AppBar(
            title: Text('My Widget'),
          ),
          body: Center(
            child: Text('Count: ${dataModel.count}'),
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: () => dataModel.increment(),
            child: Icon(Icons.add),
          ),
        );
      },
    );
  }
}