ios - Is MyViewController in the window hierarchy? -


is there way check if myviewcontroller in window hierarchy ? want know if can present uialertcontroller :

var alert = uialertcontroller(title: "hello", message: "just fun", preferredstyle: uialertcontrollerstyle.alert) myviewcontroller.presentviewcontroller(alert, animated: true, completion: nil)

the view controller's view have window property set if in hierarchy

if myviewcontroller.view.window != nil {     // in window hierarchy }

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