如何在flutter中创建刷新页面按钮？

import 'package:flutter/material.dart';

class RefreshButton extends StatefulWidget {
  @override
  _RefreshButtonState createState() => _RefreshButtonState();
}

class _RefreshButtonState extends State<RefreshButton> {
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // 刷新页面的逻辑代码
        setState(() {
          // 更新页面状态
        });
      },
      child: Text('刷新页面'),
    );
  }
}

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My Page'),
      ),
      body: Center(
        child: RefreshButton(), // 显示刷新按钮
      ),
    );
  }
}