PopupViewController #2 : PopupViewController must check if another popupView is presenting

if let vc = UIApplication.rootViewController?.presentedViewController {
    vc.dismiss(animated: false) {
        UIApplication.rootViewController?.present( myPopupVc, animated: true, completion: nil )
    }
} else {
    UIApplication.rootViewController?.present( myPopupVc, animated: true, completion: nil)
}