■ StatefulWidget 클래스를 사용하는 방법을 보여준다.
▶ 예제 코드 (DART)
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class MainPage extends StatefulWidget { final String title; MainPage({Key key, this.title}) : super(key: key); @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { int _counter = 0; void _incrementCounter() { setState(() { _counter++; }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(widget.title), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( 'You have pushed the button this many times:', ), Text( '$_counter', style: Theme.of(context).textTheme.headline4, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: Icon(Icons.add), ), ); } } |