如何在flutter中将数据从flutter对话框传递到页面？

import 'package:flutter/material.dart';

class MyDialog extends StatefulWidget {
  @override
  _MyDialogState createState() => _MyDialogState();
}

class _MyDialogState extends State<MyDialog> {
  TextEditingController _textEditingController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text('输入数据'),
      content: TextField(
        controller: _textEditingController,
        decoration: InputDecoration(hintText: '请输入数据'),
      ),
      actions: [
        FlatButton(
          child: Text('确认'),
          onPressed: () {
            String data = _textEditingController.text;
            Navigator.of(context).pop(data); // 将数据返回给调用页面
          },
        ),
      ],
    );
  }
}

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('页面'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('打开对话框'),
          onPressed: () async {
            String result = await showDialog(
              context: context,
              builder: (BuildContext context) {
                return MyDialog(); // 显示自定义对话框
              },
            );
            print(result); // 打印从对话框返回的数据
          },
        ),
      ),
    );
  }
}