dismiss two modal without showing first modal background

UIViewController+ModalHelpers.swift

extension UIViewController {
    func dismissModal(animated: Bool = true, completion: (()->Void)? = nil) {
        if let snapshot = UIApplication.shared.delegate?.window??.snapshotView(afterScreenUpdates: false) {
            self.presentedViewController?.view.addSubview(snapshot)
        }

        self.dismiss(animated: animated, completion: completion)
    }
}