关闭弹出视图控制器

Question

我将苹果付款实施到我的应用中。当我点击苹果支付按钮时，会出现标准支付弹出视图控制器。为了解雇它，我可以按下取消按钮，但我也希望能够通过单击超级视图来关闭弹出视图。

    func alertClose(gesture: UITapGestureRecognizer) {
        self.dismiss(animated: true, completion: nil)
        print("It is working")
    }


    @IBAction func PayApple(_ sender: Any) {

            let paymentViewController = PKPaymentAuthorizationViewController(paymentRequest: request)
            paymentViewController.delegate = self

            self.present(paymentViewController, animated: true, completion: {
                paymentViewController.view.superview?.isUserInteractionEnabled = true
                paymentViewController.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertClose(gesture:))))

            })
}

但我上面实施的内容并不奏效。我不确定我做错了什么。当我点击超级视图时，苹果支付弹出不会消失。