Set UIWindow in AppDelegate with SceneDelegate

Question

I was trying to init var window: UIWindow? to a UIViewController programmatically in AppDelegate.But I cannot achieve it. When I was updated my Xcode to Version 11.0 (11A420a), in project init section, I choosed to with Storyboard not to SwiftUI but I can not achieved to programmatically assign the UIWindow's rootViewController to a view controller. So first of all, I removed the Main.storyboard file, then I hang with Info.plist and removed the storyboard section as usual like I do before but there's some configs about UIApplicationSceneManifest as shown below. And

<key>UIApplicationSceneManifest</key> <dict> <key>UIApplicationSupportsMultipleScenes</key> <false/> <key>UISceneConfigurations</key> <dict> <key>UIWindowSceneSessionRoleApplication</key> <array> <dict> <key>UISceneConfigurationName</key> <string>Default Configuration</string> <key>UISceneDelegateClassName</key> <string>$(PRODUCT_MODULE_NAME).SceneDelegate</string> </dict> </array> </dict> </dict>

By the way, for checking out what happens, I tried the init window in SceneDelegate.swift and AppDelegate.swift file but simulator's screen shows black screen fully. So what I must to do?

Hint: var window: UIWindow! variable description is not added to AppDelegate default anymore, its in SceneDelegate. So can I set my rootViewController from SceneDelegate file?

What's the way to achieve fully programmatically this in the new AppDelegate/SceneDelegate approach?

You need to learn and embrace the new scene architecture of iOS 13. Start in the documentation with Scenes. — rmaddy
– rmaddy, Commented Sep 24, 2019 at 0:14
Then get some popcorn and go to WWDC 2019 Video and watch videos 808, 212, 224, 258, and 259. — rmaddy
– rmaddy, Commented Sep 24, 2019 at 0:19
@rmaddy I will watch these, what do you recommend for drinks :) ? — eemmrrkk
– eemmrrkk, Commented Sep 24, 2019 at 13:36
For anyone looking for an updated "Single View App" Xcode template that supports iOS 12 and 13 as well as supporting either a storyboard or an all-code user interface, see github.com/rmaddy/XcodeTemplates. — rmaddy
– rmaddy, Commented Sep 25, 2019 at 5:31

eemmrrkk · Accepted Answer · 2019-09-24 13:36:10Z

In AppDelegate I removed the lines which contains functions of UISceneSession Lifecyle then it worked it.

// 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. return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role) } 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. }

Than add var window: UIWindow? property to AppDelegate and inited it and set rootViewController programmatically, then worked it but for detail information, I will edit my answer as soon as I learned about UIScene workflow.

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