Question 67910 in IOS Swift Question posted in
The official documentation can be found here.

'keywindow' and 'windows' deprecated in IOS 15.0 – Ios swift

I’m trying to present the top view controller as the root view controller, the whole code works except that line :

var topController: UIViewController = UIApplication.shared.keyWindow!.rootViewController!

I get the warning :

‘keyWindow’ was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes

Then when I say :

var topController: UIViewController = UIApplication.shared.windows.first { $0.isKeyWindow }!.rootViewController!

I get :

‘windows’ was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead

And then when I say:

var topController: UIViewController = UIWindowScene.windows.first { $0.isKeyWindow }!.rootViewController!

I get :

Instance member ‘windows’ cannot be used on type ‘UIWindowScene’; did you mean to use a value of this type instead?

Can somebody help me? Sorry if this sounds easy but I’m still a novice. Thanks

Tags:

3

Answers


  1. 0

    you can set/get root view controller as follow:

    //        getting the all scenes
        let scenes = UIApplication.shared.connectedScenes
//        getting windowScene from scenes
        let windowScene = scenes.first as? UIWindowScene
//        getting window from windowScene
        let window = windowScene?.windows.first
//        getting the root view controller
        let rootVC = window?.rootViewController
//        changing the root view controller
        window?.rootViewController = someVc
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  2. 0

    You can use the following code base

    let window = UIApplication.shared.windows.first(where: { $0.isKeyWindow })

    extension UIApplication {
    
    class var topViewController: UIViewController? { return getTopViewController() }
    
    private class func getTopViewController(
        base: UIViewController? = UIApplication.keyWindow?.rootViewController) -> UIViewController? {
        if let nav = base as? UINavigationController { return getTopViewController(base: nav.visibleViewController) }
        if let tab = base as? UITabBarController {
            if let selected = tab.selectedViewController { return getTopViewController(base: selected) }
        }
        if let presented = base?.presentedViewController { return getTopViewController(base: presented) }
        return base
    }
}

extension UIApplication {
    static var keyWindow: UIWindow? {
        return shared.windows.first(where: {$0.isKeyWindow})
    }
}
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  3. 0

    You can try an alternative solution using the UIResponder class. Climbing up the hierarchy until you reach the first element of the UIWindow type.

        extension UIViewController {
        
        var keyWindow: UIWindow? {
            var parentResponder: UIResponder? = next
            while parentResponder != nil {
                if parentResponder!.classForCoder is UIWindow.Type {
                    return parentResponder as? UIWindow
                }
                parentResponder = parentResponder!.next
            }
            return nil
        }

        var rootViewController: UIViewController? {
            keyWindow?.rootViewController
        }
    }
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