如何识别Flutter动态导航栏中被点击的图标/按钮？

在Flutter中，要识别动态导航栏中被点击的图标/按钮，可以使用IndexedStack和BottomNavigationBar结合使用。IndexedStack可以根据索引值显示一个子控件，而BottomNavigationBar可以用作底部导航栏。下面是示例代码：

class MyBottomNavigationBar extends StatefulWidget {
  @override
  _MyBottomNavigationBarState createState() => _MyBottomNavigationBarState();
}

class _MyBottomNavigationBarState extends State<MyBottomNavigationBar> {
  int _selectedIndex = 0;
  static const List<Widget> _widgetOptions = <Widget>[
    Text(
      'Index 0: Home',
    ),
    Text(
      'Index 1: Business',
    ),
    Text(
      'Index 2: School',
    ),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });

    switch (index) {
      case 0:
        // Do something
        break;

      case 1:
        // Do something
        break;

      case 2:
        // Do something
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IndexedStack(
        index: _selectedIndex,
        children: _widgetOptions,
      ),
      bottomNavigationBar: BottomNavigationBar(
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Business',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'School',
          ),
        ],
        currentIndex: _selectedIndex,
        onTap: _onItemTapped,
      ),
    );
  }
}

在上面的代码中，_selectedIndex变量保留当前所选标签的索引。当用户点击底部导航栏中的标签时，_onItemTapped方法被调用，索引值被更新。接下来，可以根据索引值执行特定操作。