connectedScenes and UIWindowScene to support IOS 11 - ios

Question

I have this iOS app which trying to downgrade to support older iPhones with iOS version 11.0, but ran into few problems.
I have the below line of code in AppDelegate which shows error 'connectedScenes' is only available in iOS 13.0 or newer and 'UIWindowScene' is only available in iOS 13.0 or newer
var keyWindowDev = UIApplication.shared.connectedScenes.filter({$0.activationState == .foregroundActive}).map({$0 as? UIWindowScene}).compactMap({$0}).first?.windows.filter({$0.isKeyWindow}).first
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate,UIWindowSceneDelegate, UNUserNotificationCenterDelegate,MessagingDelegate {
var window: UIWindow?
//....
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let _ = (scene as? UIWindowScene) else { return }
}
}
//Below is keyWindowDev usage in AppDelegate
extension UIApplication {
class func topViewController(base: UIViewController? = keyWindowDev?.rootViewController) -> UIViewController? {
if let nav = base as? UINavigationController {
return topViewController(base: nav.visibleViewController)
}
if let presented = base?.presentedViewController {
return topViewController(base: presented)
}
if let tab = base as? UITabBarController {
if let selected = tab.selectedViewController {
return topViewController(base: selected)
}
}
return base
}
}
And keyWindowDev is also used to set SVProgressHUD Container View around the app
class HomeVC: UIViewController{
override func viewDidLoad() {
super.viewDidLoad()
SVProgressHUD.setContainerView(keyWindowDev)
}
}
Please how to change the line of code in keyWindowDev to support iOS 11?

Answer 1

You should be able to use something like this:
var keyWindowDev: UIWindow? = {
if #available(iOS 13.0, *) {
return UIApplication.shared.connectedScenes
.filter { $0.activationState == .foregroundActive }
.compactMap { $0 as? UIWindowScene }.first?.windows
.first(where: \.isKeyWindow)
} else {
return UIApplication.shared.keyWindow
}
}()
I made some optimizations to your original code.