State restoration

Reader/SceneDelegate.swift

@@ -27,7 +27,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         window = UIWindow(windowScene: windowScene)
         window!.tintColor = .appTintColor
         
-        var activity = connectionOptions.userActivities.first
+        var activity = connectionOptions.userActivities.first ?? session.stateRestorationActivity
         
         var account = LocalData.mostRecentAccount()
         
@@ -108,6 +108,10 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         // to restore the scene back to its current state.
     }
     
+    func stateRestorationActivity(for scene: UIScene) -> NSUserActivity? {
+        return (window!.rootViewController as! AppSplitViewController).stateRestorationActivity()
+    }
+    
     func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
         Task { @MainActor in
             await setupUI(from: userActivity)

Reader/Screens/AppSplitViewController.swift

@@ -54,6 +54,27 @@ class AppSplitViewController: UISplitViewController {
         setViewController(nav, for: .compact)
     }
     
+    func stateRestorationActivity() -> NSUserActivity? {
+        if traitCollection.horizontalSizeClass == .compact {
+            let nav = viewController(for: .compact) as! UINavigationController
+            let top = nav.topViewController!
+            if top is ReadViewController || top is ItemsViewController {
+                print(top.userActivity?.activityType)
+                return top.userActivity
+            }
+        } else {
+            if let read = secondaryNav.topViewController {
+                return read.userActivity
+            } else {
+                let homeNav = viewController(for: .primary) as! UINavigationController
+                if homeNav.topViewController is ItemsViewController {
+                    return homeNav.topViewController!.userActivity
+                }
+            }
+        }
+        return nil
+    }
+    
     func showItemList(_ type: ItemListType) {
         let column: Column
         if traitCollection.horizontalSizeClass == .compact {