dont

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const App());
}

class App extends StatelessWidget {
  const App({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      routes: {
        '/': (context) => const HomeScreen(),
      },
    );
  }
}

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  int _counter = 0;
  List<Widget> _children = [];

  @override
  void initState() {
    super.initState();
    _children = [
      MyText(count: _counter),
    ];
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          _counter.toString(),
        ),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: _children,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            _counter += 1;
          });
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}

class MyText extends StatelessWidget {
  const MyText({
    super.key,
    required this.count,
  });

  final int count;

  @override
  Widget build(BuildContext context) {
    return Text('Count: $count');
  }
}