ios - ViewController 委托(delegate)方法未从 AppDelegate 触发

Question

我正在尝试为 Flutter 应用实现 Apple Pay。下面的代码成功呈现了正确填充的 Apple Pay View 。但是，当它尝试收费时，paymentAuthorizationViewController -> didAuthorizePayment 方法应该触发，但它没有触发。应该发生的是函数被命中，我将 token 发送回我的 API 以从服务器创建费用。

我猜问题出在行 paymentAuthorizationViewController.delegate = self as? PKPaymentAuthorizationViewControllerDelegate 但我一直无法解决。

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {

    var flutterViewController: FlutterViewController!

    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
        ) -> Bool {

        GeneratedPluginRegistrant.register(with: self)

        flutterViewController = (window.rootViewController as? FlutterViewController)

        let stripeChannel = FlutterMethodChannel(name: "com.tram.gondola.ios/stripe", binaryMessenger: flutterViewController)
        stripeChannel.setMethodCallHandler({
            (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
            if ("handleApplePayButtonTapped" == call.method) {
                // create paymentRequest
                let paymentAmount: NSDecimalNumber = 12.34
                let merchantIdentifier = "merchant.com.merchantid"
                let paymentRequest = Stripe.paymentRequest(withMerchantIdentifier: merchantIdentifier, country: "US", currency: "USD")

                // Configure the line items on the payment request
                paymentRequest.paymentSummaryItems = [
                    // The final line should represent your company;
                    PKPaymentSummaryItem(label: "Company Name", amount: paymentAmount),
                ]

                if Stripe.canSubmitPaymentRequest(paymentRequest) {
                    // Setup payment authorization view controller
                    let paymentAuthorizationViewController = PKPaymentAuthorizationViewController(paymentRequest: paymentRequest)
                    paymentAuthorizationViewController.delegate = self as? PKPaymentAuthorizationViewControllerDelegate

                    // Present payment authorization view controller
                    self.flutterViewController.present(paymentAuthorizationViewController, animated: true)
                }

            }
            else {
                // There is a problem with your Apple Pay configuration
                result(false)
            }

        })

        return super.application(application, didFinishLaunchingWithOptions: launchOptions);
    }

    func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, completion: @escaping (PKPaymentAuthorizationStatus) -> Void) {
        print("didAuthorizePayment hit")
        STPAPIClient.shared().createToken(with: payment) { (token: STPToken?, error: Error?) in
            guard let token = token, error == nil else {
                // Present error to user...
                print("error")
                return
            }

            // send token back to flutter
            print(token)
            return
        }
    }

    func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
        // Dismiss payment authorization view controller
        controller.dismiss(animated: true, completion: {
            //if (paymentSucceeded) {
            // Show a receipt page...
            //}
        })
    }
}

Answer 1

您的 AppDelegate 不符合 PKPaymentAuthorizationViewControllerDelegate，因此转换失败，as? 返回 nil。因此，您的 paymentAuthorizationViewController 没有委托(delegate)，因此不会调用它的委托(delegate)方法。您应该使您的 AppDelegate 符合 PKPaymentAuthorizationViewControllerDelegate，如下所示:

@objc class AppDelegate: FlutterAppDelegate, PKPaymentAuthorizationViewControllerDelegate{