Untitled

    return WillPopScope(
      onWillPop: () async {
        if (widget.items[_selectedTab].navigatorkey?.currentState?.canPop() ?? false) {
          widget.items[_selectedTab].navigatorkey?.currentState?.pop();
          return false;
        } else {
          return true;
        }
      },
      child: Scaffold(
        body: IndexedStack(
          key: use,
          index: _selectedTab,
          children: widget.items
              .map((page) => Navigator(
                    key: page.navigatorkey,
                    onGenerateInitialRoutes: (navigator, initialRoute) {
                      return [MaterialPageRoute(builder: (context) => page.tab)];
                    },
                  ))
              .toList(),
        ),
        bottomNavigationBar: SizedBox(