Futter:如何在currentTab上更改TabItem图标

  TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this); // 3是Tab的数量
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Tab Demo'),
        bottom: TabBar(
          controller: _tabController,
          tabs: [
            Tab(icon: Icon(Icons.home)),
            Tab(icon: Icon(Icons.search)),
            Tab(icon: Icon(Icons.person)),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: [
          // Tab对应的页面组件
          HomePage(),
          SearchPage(),
          ProfilePage(),
        ],
      ),
    );
  }

setState(() {
  currentTabIndex = 1;
});

TabBar(
  controller: _tabController,
  tabs: [
    Tab(
      icon: currentTabIndex == 0
          ? Icon(Icons.home)
          : Icon(Icons.home_filled),
    ),
    Tab(
      icon: currentTabIndex == 1
          ? Icon(Icons.search)
          : Icon(Icons.search_off),
    ),
    Tab(
      icon: currentTabIndex == 2
          ? Icon(Icons.person)
          : Icon(Icons.person_outline),
    ),
  ],
),