Add iPadOS Scenes

Examples/iPadOS Scenes/BehindTheScenes/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  BehindTheScenes
+//
+//  Created by Simeon Saint-Saens on 4/6/19.
+//  Copyright © 2019 Two Lives Left. All rights reserved.
+//
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    var sceneCount = 0
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    func applicationWillTerminate(_ application: UIApplication) {
+        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        sceneCount += 1
+        
+        connectingSceneSession.userInfo = ["SceneCount" : sceneCount ]
+        
+        var sceneDelegateClass: AnyClass = SceneDelegate.self
+        
+        if let activity = options.userActivities.first,
+            let sceneType = SceneType(rawValue: activity.activityType) {
+            
+            switch sceneType {
+            case .uikitScene:
+                sceneDelegateClass = SceneDelegate.self
+            case .swiftuiScene:
+                sceneDelegateClass = SwiftUISceneDelegate.self
+            }
+        }
+        
+        let config = UISceneConfiguration(name: nil, sessionRole: connectingSceneSession.role)
+        config.sceneClass = UIWindowScene.self
+        config.delegateClass = sceneDelegateClass
+
+        return config
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+