show UIAlertController outside of ViewController

Question

I have trouble to display my UIAlertController because I\'m trying to show it in a Class which is not an ViewController.

I already tried adding it:

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Answer 1

If you solution is not working it probably because of there is no window at that moment. I had the same problem when I was trying to show alert view in application:DidFinishLoadingWithOptions method. In this case my solution was to check if root view controller is available, and if it's not, then add notification for UIApplicationDidBecomeActiveNotification

NSNotificationCenter.defaultCenter().addObserverForName(UIApplicationDidBecomeActiveNotification,
                object: nil,
                queue: NSOperationQueue.mainQueue()) {
                    (_) in
                        //show your alert by using root view controller
                        //remove self from observing
                    }
        }