在appbar中使用pageview的flutter

dependencies:
  flutter:
    sdk: flutter
  page_view: ^2.0.0

class Page1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Page 1'),
    );
  }
}

class Page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Page 2'),
    );
  }
}

class Page3 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Page 3'),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('My App'),
        ),
        body: PageView(
          children: <Widget>[
            Page1(),
            Page2(),
            Page3(),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MyApp());
}