如何从braintree payments获得卡号?

我在我的项目中使用了BrainTreePod,它在获得nonce后运行良好。但是我想检索卡片图标和卡号的数字。

如何在imageView中同时获得卡图标和UILabel中的卡号?

我用了两个pod文件。

pod 'BraintreeDropIn'
pod 'BraintreeDropIn/UIKit'

我使用的是braintree文档中提供的这个函数。

func showDropIn(clientTokenOrTokenizationKey: String) {
        let request =  BTDropInRequest()

        //BTUIKAppearance.darkTheme()
        //BTUIKAppearance.sharedInstance().primaryTextColor = UIColor.green

        let dropIn = BTDropInController(authorization: clientTokenOrTokenizationKey, request: request)
        { (controller, result, error) in
            if (error != nil) {
                print("ERROR : \(error.debugDescription)")
            } else if (result?.isCancelled == true) {
                print("CANCELLED")
            } else if let result = result {
                // Use the BTDropInResult properties to update your UI
                //result.paymentOptionType
                //result.paymentMethod
                //result.paymentIcon
                //result.paymentDescription

                if let outPut = result.paymentMethod {
                    print("\nNonce : \(outPut.nonce)")

                    self.paymentNonce = outPut.nonce
                    self.paymentCardType = result.paymentDescription.description

                }
            }
            controller.dismiss(animated: true, completion: nil)
        }
        self.present(dropIn!, animated: true, completion: nil)
    }