22.Quiz: Debug Stateful Widgets

main.dart

 import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget { @override
Widget build(BuildContext context) {
  return MaterialApp( home: MyHomePage(),
  ); }
}
class MyHomePage extends StatefulWidget { MyHomePage();
@override
createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> { int _counter = 0;
@override
Widget build(BuildContext context) {
  return Scaffold( body: Center(
    child: Column( children: <Widget>[
      Text(
        'You have pushed the button this many times:',
      ), Text(
        '$_counter',
      ),
    ], ),
  ),
    floatingActionButton: FloatingActionButton(
      onPressed: () {
        // I've added the setState method here, so whenever the user click on the Button, then it will increase counter and update on UI
        setState(() {
          _counter++;
        });
        },
      child: Icon(Icons.add), ),
  ); }
}