为什么点击后BottomNavigationBarItem的标签没有变化？

Question

我选择的和未选择的 BottomNavigationBarItems 的标签颜色没有改变...我尝试了很多方法，比如

selectedItemColor: Colors.blue,
unselectedItemColor: Colors.black,

和

unselectedLabelStyle: const TextStyle(color: Colors.grey, fontSize: 14),
selectedLabelStyle: const TextStyle(color: Colors.blue, fontSize: 14),

等等。我究竟做错了什么？这是代码：

class RandomWordsState extends State<RandomWords> {
  var _currentIndex = 0;
  var _pageList = [HomePage(), RecommendPage(), PersonalPage()];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('APPBAR'),
        centerTitle: true,
        elevation: 10,
      ),
      //body: this._pageList[this._currentIndex],
      body: IndexedStack(index: _currentIndex, children: _pageList,),
      bottomNavigationBar: BottomNavigationBar(
        selectedItemColor: Colors.blue,
        unselectedItemColor: Colors.black,
         //unselectedItemColor: Colors.black,
         //selectedItemColor: Colors.blue,
        //selectedLabelStyle: TextStyle(fontSize: 22),
        //selectedItemColor: Colors.red,
        //fixedColor: Colors.blue,

        items: <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(
              Icons.home,
              //color: _currentIndex == 0 ? Colors.blue : Colors.grey,
            ),
            label: "A",
          ),
          BottomNavigationBarItem(
            label: "B",
            icon: Icon(
              Icons.recommend,
              //color: _currentIndex == 1 ? Colors.blue : Colors.grey,
            ),
          ),
          BottomNavigationBarItem(
            icon: Icon(
              Icons.person,
              //color: _currentIndex == 2 ? Colors.blue : Colors.grey,
            ),
            label: "C",
          )
        ],
        onTap: (value){
          setState(() {
            this._currentIndex = value.toInt();
          });
        },
        // unselectedLabelStyle: const TextStyle(color: Colors.grey, fontSize: 14),
        // selectedLabelStyle: const TextStyle(color: Colors.blue, fontSize: 14),
        type: BottomNavigationBarType.fixed,
      ),
    );
  }
}

或者，另一方面，有没有办法改变 BottomNavigationBarItem 中标签的颜色？谢谢

Answer 1

需要在BottomNavigationBar上提供currentIndex才能看到效果

bottomNavigationBar: BottomNavigationBar(
  currentIndex: _currentIndex,

更多关于 BottomNavigationBar。

为什么点击后BottomNavigationBarItem的标签没有变化？

Why the label of BottomNavigationBarItem doesn't change after clicking?

android

dart

textstyle

flutter

flutter-bottomnavigation