Warning: Attempt to present > whose view is not in the window hierarchy

Question

I am trying to create and display an UIalert for my app. The alert is inside of the view controller and it will be called inside the api service call as follows.

    APIService().loginr(success: { result in
        print(result!)
        let json = result as! NSDictionary
        self.showResponseAlert(title: "Success!", message: json["message"] as? String)

    }, failure: {error in
        print(error!)
    }, parameters: parameters)

and my uiAlert

func showResponseAlert(title:String?,message:String?){
    let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "OK", style: .default))
    self.present(alert, animated: true, completion: nil)
}

and also i tried

   DispatchQueue.main.async{
       self.present(alertController, animated: true, completion: nil)
   }

but didn't work for me.

Does this answer your question? [AlertController is not in the window hierarchy](https://stackoverflow.com/questions/29257670/alertcontroller-is-not-in-the-window-hierarchy) — Daniel, Apr 24 '20 at 06:15
Did you assign rootViewController to any viewConrtoller in your project? — Muhammad Hasan Irshad, Apr 24 '20 at 06:26
@DinithePieris the solution you marked as the answer is one of the answers shown in the question I referenced previously. — Daniel, Apr 24 '20 at 17:27

score 3 · Accepted Answer · edited Apr 24 '20 at 09:10

Use this to present Alert.

func showResponseAlert(title:String?,message:String?){
    let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "OK", style: .default))
    if var topController = UIApplication.shared.keyWindow?.rootViewController {
            while let presentedViewController = topController.presentedViewController {
                topController = presentedViewController
            }
            topController.present(alert, animated: true, completion: nil)
     }
}

Warning: Attempt to present > whose view is not in the window hierarchy

1 Answers1