What is the best way to check if a UIAlertController is already presenting?

Question

I have a tableview which, when loaded, each cell could possibly return an NSError, which I have chosen to display in a UIAlertController. Problem is I get this error in the

Answer 1

you can test - in a single line - if an alert is already presented:

if self.presentedViewController as? UIAlertController != nil {
    print ("alert already presented")
}