How Can i fix this here is my code the error is on initState and didUpdateWidget i want some one to help me on this when i taped on the menu on the drawer i can not go to the page that i want to navigate to and her's my code i am using route to navigate between pages so i want you to help me please to solve this error thanks all

class _PagesTestWidgetState extends State<PagesTestWidget> {
  initState() {
     _selectTab(widget.currentTab);
     super.initState();
  }

    @override
   void didUpdateWidget(PagesTestWidget oldWidget) {
    _selectTab(oldWidget.currentTab);
     super.didUpdateWidget(oldWidget);
   }
    void _selectTab(int tabItem) {
setState(() {
  widget.currentTab = tabItem;
  switch (tabItem) {
    case 0:
      widget.currentTitle = S.of(context).notifications;
      widget.currentPage = NotificationsWidget();
      break;
    case 1:
      widget.currentTitle = S.of(context).profile;
      widget.currentPage = ProfileWidget();
      break;
    case 2:
      widget.currentTitle = settingsRepo.setting?.appName;
      widget.currentPage = HomeWidget();
      break;
    case 3:
      widget.currentTitle = S.of(context).my_orders;
      widget.currentPage = OrdersWidget();
      break;
    case 4:
      widget.currentTitle = S.of(context).favorites;
      widget.currentPage = FavoritesWidget();
      break;
  }
});
 }

   @override
  Widget build(BuildContext context) {
     return WillPopScope(
      onWillPop: () async => false,
      child: Scaffold(
        drawer: DrawerWidget(),
        appBar: AppBar(
          backgroundColor: Colors.transparent,
        elevation: 0,
        centerTitle: true,
      title: Text(
        widget.currentTitle ??
            settingsRepo.setting?.appName ??
            S.of(context).home,
        style: Theme.of(context)
            .textTheme
            .title
            .merge(TextStyle(letterSpacing: 1.3)),
      ),
      actions: <Widget>[
        new ShoppingCartButtonWidget(
            iconColor: Theme.of(context).hintColor,
            labelColor: Theme.of(context).accentColor),
      ],
    ),
    body: widget.currentPage,
    bottomNavigationBar: BottomNavigationBar(
      type: BottomNavigationBarType.fixed,
      selectedItemColor: Theme.of(context).accentColor,
      selectedFontSize: 0,
      unselectedFontSize: 0,
      iconSize: 22,
      elevation: 0,
      backgroundColor: Colors.transparent,
      selectedIconTheme: IconThemeData(size: 28),
      unselectedItemColor: Theme.of(context).focusColor.withOpacity(1),
      currentIndex: widget.currentTab,
      onTap: (int i) {
        this._selectTab(i);
      },
      items: [
        BottomNavigationBarItem(
          icon: Icon(Icons.notifications),
          title: new Container(height: 0.0),
        ),
        BottomNavigationBarItem(
          icon: Icon(Icons.person),
          title: new Container(height: 0.0),
        ),
        BottomNavigationBarItem(
            title: new Container(height: 5.0),
            icon: Container(
              width: 42,
              height: 42,
              decoration: BoxDecoration(
                color: Theme.of(context).accentColor,
                borderRadius: BorderRadius.all(
                  Radius.circular(50),
                ),
                boxShadow: [
                  BoxShadow(
                      color: Theme.of(context).accentColor.withOpacity(0.4),
                      blurRadius: 40,
                      offset: Offset(0, 15)),
                  BoxShadow(
                      color: Theme.of(context).accentColor.withOpacity(0.4),
                      blurRadius: 13,
                      offset: Offset(0, 3))
                ],
              ),
              child: new Icon(Icons.home,
                  color: Theme.of(context).primaryColor),
            )),
        BottomNavigationBarItem(
          icon: new Icon(Icons.fastfood),
          title: new Container(height: 0.0),
        ),
        BottomNavigationBarItem(
          icon: new Icon(Icons.favorite),
          title: new Container(height: 0.0),
        ),
      ],
    ),
  ),
);   
} 
}


Solution 1: asimsharf

I fix it Now Thanks all

 initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) async {
        _selectTab(widget.currentTab);
    });
  }