自定义appbarTitle + TabBarView 实现类似安卓tabHost+Fragment

话不多说上核心代码

TabBarView createTabBarView() {
    return TabBarView(controller: myTabController, children: list);
  }
   myTabController = TabController(length: list.length, vsync: this);
    myTabController?.addListener(() {
      var index = myTabController?.index;
      setState(() {
        currentTab = index!;
      });
注意：State<Index> with SingleTickerProviderStateMixin
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