I agree that the Restore protocol appears to be something you write or perhaps already wrote. If you're using iPadOS maybe you already implemented multiple windows. Well, state restoration is a key concept in multiple windows and the required restoration is similar to what needs to be done when transitioning between different size class with side bars and tab bars. Hope this helps!

The lifecycle of viewcontrollers doesn't really to do it the way you're proposing (which I actually considered). You have to write the mentioned Restore protocol or perhaps you already wrote it. If you're using iPadOS maybe you already implemented multiple windows. Well, state restoration is a key concept in multiple windows and the required restoration is similar to what needs to be done when transitioning between different size class with side bars and tab bars. Hope this helps!

Looks like I'm seeing the same thing ... did you ever find a solution?