how to go back to previous page when refresh the screen in pageview flutter - flutter

Question

I want to keep the current page, when i refersh the screen or navigating back in page view
here is the code , actually i want display the particular index screen programmatically with out clicking the button. Some times iam getting controller.hasClients getting empty. If page view has 3 screens , if iam on 2ndscreen when i refresh the second screen should display second screen, instead it always display 1st screen . Iam using page controller to display , but not able to instantiate page controller becacuse i want to access from top widgets of page view. Please help
Container(
// width: 370,
height: MediaQuery.of(context).size.height * 0.685,
child: Stack(children: <Widget>[
_pages(),
Stack(
children: <Widget>[
Align(
alignment: Alignment.bottomCenter,
child: Container(
child: Row(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
for (int i = 0; i < 3; i++)
(i == currentPage
? circleBar(true)
: circleBar(false))
],
),
),
),
],
),
]),
),
Widget _pages() {
List _pagesList = [
FirstScreen(
),
SecondScreen(
),
ThirdScreen(
),
];
return PageView.builder(
controller: _pageController,
itemCount: _pagesList.length,
// restorationId: currentPage.toString(),
itemBuilder: (BuildContext context, int index) {
// _pageController=PageController(initialPage: currentPage);
return _pagesList[index];
},
onPageChanged: (int page) {
setState(() {
currentPage = page;
selected = analyticsList[currentPage].anlyticName;
isIndexChanged = true;
page;
});
},
);
}

Answer 1

For a named route, you can use this code.
Navigator.pushNamed(context, '/screen2').then((_) {
// This block runs when you have returned back from screen 2.
setState(() {
// code here to refresh data
});
});

Answer 2

first saving the current page and instantiating page controller in pages() it worked for me
i just instantiated the page controller in pages() in my code as if declare on the top it is not getting read every refresh so i declared where the pageview get build .
Widget _pages() {
_pageController= PageController(initialPage: currentPage, keepPage: true);
List _pagesList = [
FirstScreen(
),
SecondScreen(
),
ThirdScreen(
),
];
return PageView.builder(
controller: _pageController,
itemCount: _pagesList.length,
// restorationId: currentPage.toString(),
itemBuilder: (BuildContext context, int index) {
return _pagesList[index];
},
onPageChanged: (int page) {
setState(() {
currentPage = page;
selected = analyticsList[currentPage].anlyticName;
isIndexChanged = true;
page;
});
},
);
}