使用 SwiftUI 实现 Apple Pay

Question

这是我第一次在大型项目中使用 PassKit 和 SwiftUI。我正在尝试实现 Apple Pay SwiftUI，但由于还没有原生方法，我尝试将 PKPaymentAuthorizationViewController 包装在 UIViewControllerRepresentable 中，但我不确定我是否做得正确。

该视图显示正确，点击它付款时似乎可以正常工作。我通过将视图绑定到 isPresentingApplePay 布尔值来控制 window 的显示（见下文）。当 window 应该被关闭时，就会出现问题。点击 cancel 按钮不会关闭视图；有时它甚至不调用 paymentAuthorizationViewControllerDidFinish 委托函数。同样的事情发生在提交付款之后。有时会调用 didFinish 委托，但不会关闭视图。我尝试传递绑定变量 isPresentingApplePay 并将其从 didFinish 设置为 false 但它什么也没做。使视图消失的唯一方法是点击 apple pay window 的外部的任何部分。

有谁知道我做错了什么？有什么我完全想念的吗？

通过在 if statement

下绑定视图，我让 apple pay window 在按下按钮时正确显示

这是我的 PKPaymentAuthorizationViewController 包装器：

import Foundation
import PassKit
import SwiftUI

struct ApplePayController: UIViewControllerRepresentable {
    @Environment(\.presentationMode) var presentationMode
    @EnvironmentObject var userData: UserData
    @Binding var purchase: Purchase
    @Binding var isPresenting: Bool

    let items: [PKPaymentSummaryItem]

    func updateUIViewController(_ uiViewController: PKPaymentAuthorizationViewController, context: Context) {

    }

    typealias UIViewControllerType = PKPaymentAuthorizationViewController


    func makeUIViewController(context: Context) ->  PKPaymentAuthorizationViewController {
        let applePayManager = ApplePayManager(items: items)
        let apm = applePayManager.paymentViewController()!
        apm.delegate = context.coordinator
        return apm
    }

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, PKPaymentAuthorizationViewControllerDelegate  {
        var parent: ApplePayController

        init(_ parent: ApplePayController) {
            self.parent = parent
        }

        func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
            controller.dismiss(animated: true) {
                    self.parent.isPresenting = false
                }
        }

        func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
            print("did authorize payment")

        }

        func paymentAuthorizationViewControllerWillAuthorizePayment(_ controller: PKPaymentAuthorizationViewController) {
            print("Will authorize payment")
        }
    }

    class ApplePayManager: NSObject {
        let currencyCode: String
        let countryCode: String
        let merchantID: String
        let paymentNetworks: [PKPaymentNetwork]
        let items: [PKPaymentSummaryItem]

        init(items: [PKPaymentSummaryItem],
               currencyCode: String = "USD",
               countryCode: String = "US",
               merchantID: String = "xxx.merchant.xxx",
               paymentNetworks: [PKPaymentNetwork] = [PKPaymentNetwork.amex, PKPaymentNetwork.masterCard, PKPaymentNetwork.visa]) {
            self.items = items
            self.currencyCode = currencyCode
            self.countryCode = countryCode
            self.merchantID = merchantID
            self.paymentNetworks = paymentNetworks
        }

        func paymentViewController() -> PKPaymentAuthorizationViewController? {
            if PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: paymentNetworks) {
                let request = PKPaymentRequest()
                request.currencyCode = self.currencyCode
                request.countryCode = self.countryCode
                request.supportedNetworks = paymentNetworks
                request.merchantIdentifier = self.merchantID
                request.paymentSummaryItems = items
                request.merchantCapabilities = [.capabilityCredit, .capabilityDebit]
                return PKPaymentAuthorizationViewController(paymentRequest: request)
            }
            return nil
        }
    }
}

这就是我在 UIView 中显示它的方式：

if isPresentingApplePay {
    ApplePayController(purchase: self.$currentOrder.purchase, isPresenting: $isPresentingApplePay, items: self.createOrder(with: self.currentOrder.purchase)).environmentObject(self.userData)
}

Answer 1

我遇到过类似的问题，然后我通过使用另一种不连接 UIViewControllerRepresentable 的方法解决了问题。相反，我创建了一个单独的 class 来处理 Apple Pay，如下所示

import PassKit

typealias PaymentCompletionHandler = (Bool) -> Void

class PaymentHandler: NSObject {

static let supportedNetworks: [PKPaymentNetwork] = [
    .amex,
    .masterCard,
    .visa
]

var paymentController: PKPaymentAuthorizationController?
var paymentSummaryItems = [PKPaymentSummaryItem]()
var paymentStatus = PKPaymentAuthorizationStatus.failure
var completionHandler: PaymentCompletionHandler?

func startPayment(completion: @escaping PaymentCompletionHandler) {

    let amount = PKPaymentSummaryItem(label: "Amount", amount: NSDecimalNumber(string: "8.88"), type: .final)
    let tax = PKPaymentSummaryItem(label: "Tax", amount: NSDecimalNumber(string: "1.12"), type: .final)
    let total = PKPaymentSummaryItem(label: "ToTal", amount: NSDecimalNumber(string: "10.00"), type: .pending)

    paymentSummaryItems = [amount, tax, total];
    completionHandler = completion

    // Create our payment request
    let paymentRequest = PKPaymentRequest()
    paymentRequest.paymentSummaryItems = paymentSummaryItems
    paymentRequest.merchantIdentifier = "merchant.com.YOURDOMAIN.YOURAPPNAME"
    paymentRequest.merchantCapabilities = .capability3DS
    paymentRequest.countryCode = "US"
    paymentRequest.currencyCode = "USD"
    paymentRequest.requiredShippingContactFields = [.phoneNumber, .emailAddress]
    paymentRequest.supportedNetworks = PaymentHandler.supportedNetworks

    // Display our payment request
    paymentController = PKPaymentAuthorizationController(paymentRequest: paymentRequest)
    paymentController?.delegate = self
    paymentController?.present(completion: { (presented: Bool) in
        if presented {
            NSLog("Presented payment controller")
        } else {
            NSLog("Failed to present payment controller")
            self.completionHandler!(false)
         }
     })
  }
}

/*
    PKPaymentAuthorizationControllerDelegate conformance.
*/
extension PaymentHandler: PKPaymentAuthorizationControllerDelegate {

func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController, didAuthorizePayment payment: PKPayment, completion: @escaping (PKPaymentAuthorizationStatus) -> Void) {

    // Perform some very basic validation on the provided contact information
    if payment.shippingContact?.emailAddress == nil || payment.shippingContact?.phoneNumber == nil {
        paymentStatus = .failure
    } else {
        // Here you would send the payment token to your server or payment provider to process
        // Once processed, return an appropriate status in the completion handler (success, failure, etc)
        paymentStatus = .success
    }

    completion(paymentStatus)
}

func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
    controller.dismiss {
        DispatchQueue.main.async {
            if self.paymentStatus == .success {
                self.completionHandler!(true)
            } else {
                self.completionHandler!(false)
            }
        }
    }
}

}

并为 Apple Pay 弹出窗口使用了以下按钮代码。

struct ContentView: View {

let paymentHandler = PaymentHandler()

var body: some View {
    Button(action: {
            self.paymentHandler.startPayment { (success) in
                if success {
                    print("Success")
                } else {
                    print("Failed")
                }
            }
        }, label: {
            Text("PAY WITH  APPLE")
            .font(Font.custom("HelveticaNeue-Bold", size: 16))
            .padding(10)
            .foregroundColor(.white)
    }
}

}

终于可以正常使用了

Answer 2

可在此处找到用于呈现 PKPaymentAuthorizationViewController 的版本：

我使用的包装器如下所示：

import PassKit
import SwiftUI

struct ApplePayWrapper: UIViewControllerRepresentable {
    typealias UIViewControllerType = PKPaymentAuthorizationViewController

    let request: PKPaymentRequest

    func makeUIViewController(context: Context) -> PKPaymentAuthorizationViewController {
        let applePayController = PKPaymentAuthorizationViewController(paymentRequest: request)
        return applePayController!
    }

    func updateUIViewController(_ uiViewController: PKPaymentAuthorizationViewController, context: Context) {
        // Nothing
    }
}

我用ViewModel作为delegate，你需要在let request: PKPaymentRequest之后的struct的字段中添加这个，然后设置创建 PKPaymentAuthorizationViewController

时委托

Answer 3

您甚至根本不需要在 SwiftUI 中使用 UIViewControllerRepresentable 或 UIKit。使用 PKPaymentAuthorizationController, NOT the view controller version:

let request = PKPaymentRequest()
request.paymentSummaryItems = ...

let controller = PKPaymentAuthorizationController(paymentRequest: request)
controller.delegate = self

controller.present { [weak self] presented in
   // Apple Pay presented from scene window
}

https://developer.apple.com/forums/thread/649662?answerId=641228022#641228022

Answer 4

Taif 接受的答案在 PaymentHandler 方面非常好。

但要使用实际的 Apple Pay 按钮，听起来您运行遇到了与我完全相同的问题！基本上，您必须将 UIViewRepresentable 放在 ButtonStyle 中，然后使用它设置 SwiftUI 按钮的样式。我不确定为什么这是真的，但这是它应该工作的代码：

import SwiftUI
import UIKit
import PassKit

struct PaymentButton: View {
    let paymentHandler = PaymentHandler() //As defined by Taif

    var body: some View {
        Button(action: {
            // Using the code from Tarif!
            self.paymentHandler.startPayment { success in
                if success {
                    print("Success")
                } else {
                    print("Failed")
                }
            }
        }, label: { EmptyView() } )
            .buttonStyle(PaymentButtonStyle())
    }
}

struct PaymentButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        return PaymentButtonHelper()
    }
}  
    
struct PaymentButtonHelper: View {
    var body: some View {
        PaymentButtonRepresentable()
            .frame(minWidth: 100, maxWidth: 400)
            .frame(height: 60)
            .frame(maxWidth: .infinity)
    }
}

extension PaymentButtonHelper {
    struct PaymentButtonRepresentable: UIViewRepresentable {
    
    var button: PKPaymentButton {
        let button = PKPaymentButton(paymentButtonType: .buy, paymentButtonStyle: .black) /*customize here*/
        button.cornerRadius = 4.0 /* also customize here */
        return button
    }
     
    func makeUIView(context: Context) -> PKPaymentButton {
        return button
    }
    func updateUIView(_ uiView: PKPaymentButton, context: Context) { }
}

然后要使用它，你会说

struct ContentView: View {
    var body: some View {
        PaymentButton()
    }
}

使用 SwiftUI 实现 Apple Pay

Implementing Apple Pay with SwiftUI

ios

passkit

applepay

swiftui

uiviewrepresentable