import 'package:flutter/cupertino.dart'; class PharmacyPagesViewModel with ChangeNotifier { int currentTab = 0; PageController? pageController; PharmacyPagesViewModel() { pageController = PageController(keepPage: true); } changeCurrentTab(int tab) { if (pageController!.hasClients) { currentTab = tab; pageController!.jumpToPage(tab); notifyListeners(); } } }