presentedViewController
The view controller that is presented by this view controller, or one of its ancestors in the view controller hierarchy.
Declaration
var presentedViewController: UIViewController? { get }Discussion
When you present a view controller modally (either explicitly or implicitly) using the present(_:animated:completion:) method, the view controller that called the method has this property set to the view controller that it presented. If the current view controller did not present another view controller modally, the value in this property is nil.