在屏幕之间传输数据

在主屏幕上，我在输入字段中输入文本，单击按钮，发生到第二屏幕的转换，数据被传输并显示在第二屏幕上。
当我在第二个屏幕上执行相同操作时，当我转到第一个屏幕时，数据不会传输。
第一种方式

Navigator.pop(context, _MyHomePageState(data: _controller.text));

第二种方式

Navigator.push(
 context,
 //MaterialPageRoute(builder: (context) => Two())
 MaterialPageRoute(builder: (_) => _MyHomePageState(data: _controller.text,))
).then((value) {
 _controller.text = ''; //очистка поля ввода
});

误入

_MyHomePageState(data: _controller.text,)

接下来是main.dart的完整代码和截图

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
  return MaterialApp(
   debugShowCheckedModeBanner: false,
   title: 'Name App',
   theme: ThemeData(
    primarySwatch: Colors.blue,
   ),
   home: MyHomePage(),
  );
 }
}
class MyHomePage extends StatefulWidget {
 @override
 _MyHomePageState createState() => _MyHomePageState(data: null);
}

class _MyHomePageState extends State<MyHomePage> {

 //это будет передаваться в другой экран
 TextEditingController _controller;

 //это будет передано с другого экрана
 String data;

 _MyHomePageState ({@required this.data});

 @override
 void initState() {
  super.initState();

  _controller = TextEditingController();
  data = '';

 }

 @override
 void dispose() {
  super.dispose();
 }

 void _f1() {
  setState(() {
  });
 }

 @override
 Widget build(BuildContext context) {
  return Scaffold(
   appBar: AppBar(
    title: Text('Main screen'),
   ),
   body: Stack(
    children: [
     Align(
      alignment: Alignment.topCenter,
      child: Padding(
       padding: const EdgeInsets.all(16.0),
       child: TextField(
        controller: _controller,
        cursorColor: Colors.pink,
        decoration: InputDecoration(
         border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(15.0),
          borderSide: BorderSide()
         ),
        ),
       ),
      ),
     ),
     Align(
      alignment: Alignment.center,
      child: Text(
       (data == null) ? '' : data,
       style: TextStyle(
        fontSize: 46.0,
        color: Colors.pink
       ),
      ),
     ),
     Align(
      alignment: Alignment.bottomCenter,
      child: Container(
       width: double.infinity,
       margin: const EdgeInsets.all(16.0),
       child: RaisedButton(
        onPressed: () {
         Navigator.push(
          context,
          //MaterialPageRoute(builder: (context) => Two())
          MaterialPageRoute(builder: (_) => Two(data: _controller.text,))
         ).then((value) {
          _controller.text = ''; //очистка поля ввода
         });
        },
        splashColor: Colors.blue.withOpacity(0.5),
        shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(10)
        ),
        child: Text(
         'Go to Two',
         style: TextStyle(
          color: Colors.deepPurple,
          fontSize: 20.0,
         ),
        ),
       ),
      ),
     ),
    ],
   ),
  );
 }

}

class Two extends StatelessWidget {

 //это будет передаваться в другой экран
 TextEditingController _controller = TextEditingController();

 //это будет передаваться в другой экран
 String data;

 Two({Key key, @required this.data}) : super(key: key);

 @override
 Widget build(BuildContext context) {
  return Scaffold(
   appBar: AppBar(
    title: Text('Two screen'),
   ),
   body: Stack(
    children: [
     Align(
      alignment: Alignment.topCenter,
      child: Padding(
       padding: const EdgeInsets.all(16.0),
       child: TextField(
        controller: _controller,
        cursorColor: Colors.pink,
        decoration: InputDecoration(
         border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(15.0),
          borderSide: BorderSide()
         ),
        ),
       ),
      ),
     ),
     Align(
      alignment: Alignment.center,
      child: Text(
       (data == null) ? '' : data,
       style: TextStyle(
        fontSize: 46.0,
        color: Colors.blue
       ),
      ),
     ),
     Align(
      alignment: Alignment.bottomCenter,
      child: Container(
       width: double.infinity,
       margin: const EdgeInsets.all(16.0),
       child: RaisedButton(
        onPressed: () {
         //1 способ ошибки нет, но данные не выводятся
         Navigator.pop(context, _MyHomePageState(data: _controller.text));

         //2 способ ошибка в _MyHomePageState(data: _controller.text,)
         /*Navigator.push(
          context,
          //MaterialPageRoute(builder: (context) => Two())
          MaterialPageRoute(builder: (_) => _MyHomePageState(data: _controller.text,))
         ).then((value) {
          _controller.text = ''; //очистка поля ввода
         });*/

        },
        splashColor: Colors.blue.withOpacity(0.5),
        shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(10)
        ),
        child: Text(
         'Go to Main',
         style: TextStyle(
          color: Colors.deepPurple,
          fontSize: 20.0,
         ),
        ),
       ),
      ),
     ),
    ],
   ),
  );
 }
}