Add iPadOS Scenes

Examples/iPadOS Scenes/BehindTheScenes/SwiftUISceneDelegate.swift

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+//
+//  SwiftUISceneDelegate.swift
+//  BehindTheScenes
+//
+//  Created by Simeon Saint-Saens on 4/6/19.
+//  Copyright © 2019 Two Lives Left. All rights reserved.
+//
+
+import UIKit
+import SwiftUI
+
+class SwiftUISceneDelegate: UIResponder, UIWindowSceneDelegate {
+    var window: UIWindow?
+    
+    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
+        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
+        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
+        guard let windowScene = (scene as? UIWindowScene) else { return }
+        
+        let count = session.userInfo?["SceneCount"] as? Int ?? 0
+        
+        window = UIWindow(windowScene: windowScene)
+        window?.rootViewController = UIHostingController(rootView: ContentView(count: count))
+        window?.makeKeyAndVisible()
+    }
+}