向上滚动时隐藏BottomNavigationBar

Question

在第三项中使用BottomNavigationBar，我有1个ListView.builder，

如何在向上滚动时隐藏BottomNavigationBar

提供的代码：

Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(
    title: Text("Go Bid"),
    backgroundColor: Colors.green,
  ),
  body: tabs[_currentIndex],
  bottomNavigationBar: Container(
    child: BottomNavigationBar(
      currentIndex: _currentIndex,
      type: BottomNavigationBarType.fixed,
      backgroundColor: Colors.green,
      items: const [
        BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text("Status"),
            backgroundColor: Colors.green
        ),
        BottomNavigationBarItem(
            icon: Icon(Icons.search),
            title: Text("Search"),
            backgroundColor: Colors.green
        ),
      ],
    ),
  ),
);