The app delegate must implement the window property if it wants to use a main storyboard file swift

Question

I have just developed an app, but when running in the simulator the debugger console says:

The app delegate must implement the window property if it w

Answer 1

I have received this error, when I created new project in XCode 11. I have not used SwiftUI. Here are the steps, I have considered to fix this.

1. Deleted Application Scene Manifest entry from Info.plist
2. Deleted SceneDelegate.swift file
3. Deleted all scene related methods in AppDelegate.swift class
4. added var window: UIWindow? property in AppDelegate.swift class

After these steps, I am able to run the app on version prior to iOS 13.

[EDIT]
Finally, your AppDelegate.swift file should look something like the following.

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

}