How to refresh Widget in CupertinoTabScaffold tabBuilder Flutter? - flutter

Question

I have a tabBuilder with switch case, I have a tab that needs to be refreshed after authorization or logout. I have a token variable which is assigned a value after authorization. I need to update the widget every time my variable is assigned a value, how can i make it? I also have a way to update the tab every time you go to it, but it will not work here
#override
Widget build(BuildContext context) {
setState(() {
Constants.USER_TOKEN; // my token variable
});
return CupertinoTabScaffold(
controller: _controller,
key: myKey,
backgroundColor: Colors.black87,
tabBar: CupertinoTabBar(
iconSize: 30,
currentIndex: currentIndex,
onTap: onItemTapped,
items: const [
BottomNavigationBarItem(icon: Icon(Icons.home, size: 25)),
BottomNavigationBarItem(icon: Icon(Icons.store, size: 25,)),
BottomNavigationBarItem(icon: Icon(Icons.shopping_bag, size: 25)),
BottomNavigationBarItem(icon: Icon(Icons.person, size: 25)),
],
),
tabBuilder: (BuildContext context, int index) {
print(currentIndex);
switch (index) {
case 0:
// The page that should be updated when the variable changes
return
CupertinoTabView(
builder: (BuildContext context) {
return const CupertinoPageScaffold(
resizeToAvoidBottomInset: false,
child: HomePage(),
);
},
);
case 1:
return CupertinoTabView(
builder: (BuildContext context) {
return const CupertinoPageScaffold(
resizeToAvoidBottomInset: false,
child: CatalogPage(),
);
},
);
case 2:
return currentIndex == 2 ? // my always refresh method
CupertinoTabView(
builder: (BuildContext context) {
return const CupertinoPageScaffold(
resizeToAvoidBottomInset: false,
child: ShoppingBag(),
);
},
) : Container();
case 3:
return CupertinoTabView(
builder: (BuildContext context) {
return const CupertinoPageScaffold(
resizeToAvoidBottomInset: false,
child: UserProfileScaffold(),
);
},
);
default:
return Container();
}
});
}