Flutter: AutomaticKeepAliveClientMixin is not working with BottomNavigationBar

Question

I have page called AddPatientView with BottomNavigationBar containing AddPatientInfo and AddPatientImages pages. All of these three are Stateful widgets.

By default

Answer 1

From the documentation on AutomaticKeepAliveClientMixin:

/// A mixin with convenience methods for clients of [AutomaticKeepAlive]. Used
/// with [State] subclasses.
///
/// Subclasses must implement [wantKeepAlive], and their [build] methods must
/// call `super.build` (the return value will always return null, and should be
/// ignored).

So in your example, before you return the Scaffold just call super.build:

  Widget build(BuildContext context) {
    super.build(context);
    return Scaffold(...);
  }