[how do I refresh the shuttle page after jumping back?]

Baidu a lot , But it's not clear , Quote an example on the Internet
https://www.nstack.in/blog/flutter-refresh-on-navigator-pop-or-go-back/
The code is as follows ：

import 'package:flutter/material.dart';


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


class MyApp extends StatelessWidget {
    
  @override
  Widget build(BuildContext context) {
    
    return MaterialApp(
      title: 'Refresh on Go Back',
      home: HomePage(),
    );
  }
}


class HomePage extends StatefulWidget {
    
  @override
  _HomePageState createState() => _HomePageState();
}


class _HomePageState extends State<HomePage> {
    
  int id = 0;


  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text(
              'Data: $id',
              style: Theme.of(context).textTheme.headline5,
            ),
            RaisedButton(
              child: Text('Second Page'),
              onPressed: navigateSecondPage,
            ),
          ],
        ),
      ),
    );
  }
  
  void refreshData() {
    
    id++;
  }


  onGoBack(dynamic value) {
    
    refreshData();
    setState(() {
    });
  }


//  Part I places to be set 
  void navigateSecondPage() {
    
    Route route = MaterialPageRoute(builder: (context) => SecondPage());
    Navigator.push(context, route).then(onGoBack);
  }
}


class SecondPage extends StatelessWidget {
    
  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(
        title: Text('Second Page'),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
    
            // Part II places to be set 
            Navigator.pop(context);
          },
          child: Text('Go Back'),
        ),
      ),
    );
  }
}

The key to backward refresh ：
from HomePage To SecondPage Use
// Part I places to be set
void navigateSecondPage() {
Route route = MaterialPageRoute(builder: (context) => SecondPage());
Navigator.push(context, route).then(onGoBack);
}
The key is also here , There is .then Refresh method in .
onGoBack(dynamic value) {
refreshData();
setState(() {});
};

from SecondPage Back to HomePage when , Use
// Part II places to be set
Navigator.pop(context);
in other words , No additional pass parameters are required , Back to HomePage I will jump over according to the first time Navigator.push Medium .then Method auto refresh .