Hi there,
I've setup scene-based state restoration for my iPhone/iPad app and it works perfectly.
In func sceneWillResignActive(_ scene: UIScene) I create an NSUserActivity object and assigned it to the scene.userActivity
I then return scene.userActivity from func stateRestorationActivity(for scene: UIScene) -> NSUserActivity?
The first issue I'm facing with Catalyst is func sceneWillResignActive(_ scene: UIScene) is being called after func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? so the restoration activity is never set.
I tried setting the scene.userActivity in the func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? function and it seemed to work insomuch as I can see there is an NSUserActivity created. Even so, session.stateRestorationActivity is nil when func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) is called.
I've disabled the "Close windows when quitting app" option in System Preference > General. I also noticed a post somewhere suggesting you wait for the app to disappear from Activity Monitor before relaunching. I've tried this to no avail.
