效果图:
https://ucc.alicdn.com/images/user-upload-01/20190506121127408.gif
BottomNavigationBar:
class MyHomePage extends StatefulWidget { MyHomePage({Key key}) : super(key: key); @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { int _selectedIndex = 1; final _widgetOptions = [ Text('Index 0: Home'), Text('Index 1: Business'), Text('Index 2: School'), ]; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('BottomNavigationBar Sample'), ), body: Center( child: _widgetOptions.elementAt(_selectedIndex), ), bottomNavigationBar: BottomNavigationBar( items: <BottomNavigationBarItem>[ BottomNavigationBarIte