问Braintree DropIn + Apple，没有出现Apple项目

EN

func showDropIn(clientTokenOrTokenizationKey: String) {

        BTUIKAppearance.darkTheme()
        let request = BTDropInRequest()    
        let canMakePayments = PKPaymentAuthorizationViewController.canMakePayments() && PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: [.amex, .visa, .masterCard])
        request.applePayDisabled = !canMakePayments
        request.cardDisabled = false

        let dropIn = BTDropInController.init(authorization: clientTokenOrTokenizationKey, request: request) { (controller, result, error) in

            if (error != nil) {
                print("ERROR")
            } else if (result?.isCancelled == true) {
                print("CANCELLED")

            } else if let result = result{

                switch result.paymentOptionType {
                case .applePay ,.payPal,.masterCard,.discover,.visa:

                    if let paymentMethod = result.paymentMethod {

                        controller.dismiss(animated: true, completion: nil)
                    } else {

                        controller.dismiss(animated: true, completion: {

                            self.braintreeClient = BTAPIClient(authorization: clientTokenOrTokenizationKey)

                            let paymentRequest = self.paymentRequest()

                            if let vc = PKPaymentAuthorizationViewController(paymentRequest: paymentRequest)
                                as PKPaymentAuthorizationViewController?
                            {
                                vc.delegate = self
                                self.present(vc, animated: true, completion: nil)
                            } else {
                                print("Error: Payment request is invalid.")
                            }

                        })
                    }

                default:
                    print("error")
                    controller.dismiss(animated: true, completion: nil)
                }
            }
        }

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