flutter:如何向对话框传递值？

import 'package:flutter/material.dart';

class CustomDialog extends StatelessWidget {
  final String value;

  CustomDialog({required this.value});

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('Dialog'),
      content: Text('Received value: $value'),
      actions: [
        TextButton(
          child: Text('Close'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ],
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Dialog Example'),
      ),
      body: Center(
        child: ElevatedButton(
          child: Text('Open Dialog'),
          onPressed: () {
            showDialog(
              context: context,
              builder: (BuildContext context) {
                return CustomDialog(value: 'Hello World');
              },
            );
          },
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyHomePage(),
  ));
}