Losing widget state when switching pages in a Flutter PageView

Question

I have a series of stateful widgets in a PageView managed by a PageController. I am using pageController.jumpToPage(index) to switch pages. When switching pages

Answer 1

keepPage: true is the default behavior; it means that the PageController will remember what page it's on if it is destroyed and recreated. This isn't what you want.

Instead, pass a page-specific PageStorageKey to the constructor of the pages. This helps Flutter give a unique storage bucket to your page. Then in your State that you want to have restored to its previous condition, you can use PageStorage.of(context) to get the storage bucket, which you can read values from in initState and write values to when they change. You can see an example in ExpansionTile.