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你好，我正在学习颤振。几年前我是一名程序员。我出于某种原因退出了编程并开始做自己的生意。现在我正在尝试开发一个应用程序来管理我的业务。

所以，我确实在这里发布了我的问题的解决方案，但我想让我的代码更好..

有没有办法访问 BottomNavigationBarItem() 的标签文本并更新 appBarTitle 值，而不是使用硬编码的 SWITCH - CASE？

这是我的代码示例。我希望我的代码更加动态而不是硬编码..

  class MainPage extends StatefulWidget {
    @override
    _MainPageState createState() => _MainPageState();
  }

  class _MainPageState extends State<MainPage> {
    String _appBarTitle = "Gadi Wala !!";
    int _selectedIndex = 0;
    static const TextStyle optionStyle =
        TextStyle(fontSize: 30, fontWeight: FontWeight.bold);

    static List<Widget> _widgetOptions = <Widget>[
      LedgerPage(),
      Text(
        'Index 1 : Trips',
        style: optionStyle,
      ),
      Text(
        'Index 2 : Trucks',
        style: optionStyle,
      ),
      Text(
        'Index 3 : Profile',
        style: optionStyle,
      ),
    ];

    void _onItemTapped(int index) {
      setState(() {
        _selectedIndex = index;
        switch (index) {
          case 0:
            _appBarTitle = "Ledger";
            break;
          case 1:
            _appBarTitle = "Trips";
            break;
          case 2:
            _appBarTitle = "Trucks";
            break;
          case 3:
            _appBarTitle = "Profile";
            break;
          default:
            _appBarTitle = "Gadi Wala";
        }
      });
    }

    @override
    Widget build(BuildContext context) {
      return Scaffold(
        appBar: AppBar(
          leading: Icon(
            Icons.local_shipping,
            color: Colors.white70,
            size: 24.0,
          ),
          title: Text(_appBarTitle),
          actions: [
            IconButton(
              icon: Icon(Icons.notifications),
              onPressed: () {},
            )
          ],
        ),
        body: Center(
          child: _widgetOptions.elementAt(_selectedIndex),
        ),
        bottomNavigationBar: BottomNavigationBar(
          items: <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.auto_stories),
              label: 'Ledger',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.alt_route_rounded),
              label: 'Trips',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.local_shipping_rounded),
              label: 'Trucks',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.person_pin_rounded),
              label: 'Profile',
            ),
          ],
          backgroundColor: Colors.blue,
          selectedFontSize: 20,
          unselectedItemColor: Colors.grey,
          showUnselectedLabels: true,
          currentIndex: _selectedIndex,
          selectedItemColor: Colors.teal[800],
          onTap: _onItemTapped,
        ),
      );
    }
  }

先感谢您 ！！

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