如何在Flutter无状态小部件中切换

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: RaisedButton(
        onPressed: () {
          // 切换逻辑
        },
        child: Text('切换'),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool isSwitched = false;

  @override
  Widget build(BuildContext context) {
    return Container(
      child: RaisedButton(
        onPressed: () {
          setState(() {
            isSwitched = !isSwitched;
          });
        },
        child: Text(isSwitched ? '已切换' : '未切换'),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('切换示例'),
        ),
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}