Xcode 11 beta: AppDelegate file doesn't have window global variable

Question

I am facing an issue in Xcode 11 beta.

The problem is that I am not getting default window variable declared in AppDelegate file.

Is anybody facing this same issue?

I am using Xcode 11 beta, simply I created single view application. In AppDelegate file there is no object call window. Whereas we had it during previous Xcode versions. — Rashesh Bosamiya, Jun 15 '19 at 16:03
I want to use window variable to set rootViewController. Does that make sense? — Rashesh Bosamiya, Jun 15 '19 at 16:09
`UIApplicationDelegate` already defines the `window` property. `UIApplication.shared.delegate?.window`. — rmaddy, Jun 15 '19 at 16:11

score 7 · Answer 1 · edited Feb 02 '21 at 14:35

7

In Xcode 11 this is now done in SceneDelegate

EDIT: if you’re still supporting iOS 12 or prior (or want to support 13 plus prior)

Add the UIWindowSceneDelegate to ApplicationDelegate

Add : var window:UIWindow?

Then proceed as you would to setting up in didFinishLaunching

edited Feb 02 '21 at 14:35

Nikolaj Nielsen

1,445
2
15
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answered Jun 24 '19 at 06:08

Michael Garcia

71
4

Yes, but what if your new project's target is iOS11 or iOS12? That line needs to be in `AppDelegate` then. – dfd Aug 06 '19 at 11:59
did you find any solution for this ? – prateek sharma Sep 30 '19 at 15:45

score 4 · Answer 2 · answered Oct 07 '19 at 08:22

The default var window: UIWindow? Is now moved in SceneDelegate.swift. To set a rootViewController in Xcode 11 you can work within SceneDelegate.swift file, In the scene delegate, you must create the window instance and the root view controller like below:

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        // set or create your viewController here
        let yourViewController = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(identifier: "yourViewController") as! YourViewController
        // set the rootViewController here using window instance
        self.window?.rootViewController = yourViewController
    }

Also this answer is helpful : Why is manually setup root view controller showing black screen?

Hope it will help you!

This function can only be used in iOS 13 as it write – Tj3n Oct 22 '19 at 07:13 — Tj3n, Oct 22 '19 at 07:13

score 0 · Answer 3 · answered Jul 05 '19 at 13:14

In my case, that's all it takes.

    var window: UIWindow? // add this by yourself
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        window = UIWindow(frame: Device.bounds)
        let root = DDTabBarController()
        window?.rootViewController = root
        window?.makeKeyAndVisible()
        return true
    }

score 0 · Answer 4 · answered Mar 27 '20 at 17:55

My approach:

first, in AppDelegate create a static property with the class of the view controller you want to access, like this

class AppDelegate: UIResponder, UIApplicationDelegate {

    // MARK: Home
    static var homeViewController: HomeViewController?

    ...
}

then, in the view controller

// MARK: - Managing the view
override func viewDidLoad() {
    super.viewDidLoad()

    // Singleton
    AppDelegate.homeViewController = self

    ...
}

how to use:

extension UIViewController {
    var homeViewController: HomeViewController? {
        if let controller = self as? HomeViewController {
            return controller
        }

        return AppDelegate.homeViewController
    }
}

Xcode 11 beta: AppDelegate file doesn't have window global variable

4 Answers4