使用BottomNavigationBar时禁用滑动手势

PageView(
  physics: NeverScrollableScrollPhysics(),
  children: [
    // 页面1
    // 页面2
    // ...
  ],
)

IndexedStack(
  index: _currentIndex,
  children: [
    // 页面1
    // 页面2
    // ...
  ],
)

class CustomBottomNavigationBar extends StatefulWidget {
  @override
  _CustomBottomNavigationBarState createState() =>
      _CustomBottomNavigationBarState();
}

class _CustomBottomNavigationBarState extends State<CustomBottomNavigationBar> {
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {
    return BottomNavigationBar(
      currentIndex: _currentIndex,
      onTap: (index) {
        setState(() {
          _currentIndex = index;
        });
      },
      items: [
        // 导航栏选项
      ],
    );
  }
}