Flutter - ListView saving items data

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyPage(),
    );
  }
}

class MyPage extends StatefulWidget {
  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State<MyPage> {
  int _count = 1;

  void _addItem() {
    setState(() {
      _count += 1;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView.builder(
        itemBuilder: (ctx, i) => TextField(),
        itemCount: _count,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _addItem,
        child: Icon(Icons.add),
      ),
    );
  }
}