gallery/Gallery/SceneDelegate.swift

import UIKit
import CoreData

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?
    
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let userActivity = connectionOptions.userActivities.first ?? session.stateRestorationActivity {
            if !configure(window: window, with: userActivity) {
                print("Failed to restore from \(userActivity)")
            }
        }
        
        #if targetEnvironment(macCatalyst)
        guard let windowScene = (scene as? UIWindowScene) else { return }

        if let titlebar = windowScene.titlebar {
            titlebar.titleVisibility = .hidden
            titlebar.toolbar = nil
        }
        #endif
    }
    
    func sceneDidEnterBackground(_ scene: UIScene) {
        (UIApplication.shared.delegate as? AppDelegate)?.saveContext()
    }
    
    func getPostFromActivity(activity: NSUserActivity ) -> Post? {
        if let photoID = activity.userInfo?["name"] as? String {
            guard let appDelegate =
                UIApplication.shared.delegate as? AppDelegate else {
                    return nil
            }
            
            let managedContext = appDelegate.persistentContainer.viewContext
            
            let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Post")
            
            request.predicate = NSPredicate(format: "name = %@", photoID)
            request.returnsObjectsAsFaults = false
            
            do {
                let result = try managedContext.fetch(request)
                
                return result[0] as? Post;
            } catch _ as NSError {
                return nil
            }
        }
        
        return nil
    }
    
    func configure(window: UIWindow?, with activity: NSUserActivity) -> Bool {
        if activity.activityType == "post" {
            if let post = getPostFromActivity(activity: activity) {
                if let photoDetailViewController = PostDetailViewController.loadFromStoryboard() {
                    photoDetailViewController.post = post
                    photoDetailViewController.isPopup = true
                    
                    if let navigationController = window?.rootViewController as? UINavigationController {
                        navigationController.pushViewController(photoDetailViewController, animated: false)
                        
                        return true
                    }
                }
            }
        } else if activity.activityType == "tags" {
            if let post = getPostFromActivity(activity: activity) {
                if let editTagsController = EditTagsViewController.loadFromStoryboard() {
                    editTagsController.post = post
                    
                    if let navigationController = window?.rootViewController as? UINavigationController {
                        navigationController.pushViewController(editTagsController, animated: false)
                        
                        return true
                    }
                }
            }
        }
        
        return false
    }
}