如何在 iOS 11 中处理应用内购买的 shouldAddStorePayment？

我正在尝试实施这个新的paymentQueue(_:shouldAddStorePayment:for:) https://developer.apple.com/documentation/storekit/skpaymenttransactionobserver/2877502-paymentqueue方法，以便我的应用程序可以直接从 App Store 处理 IAP。

我正在使用itms-services://测试它的网址，就像它说的那样here https://developer.apple.com/documentation/storekit/original_api_for_in-app_purchase/testing_promoted_in-app_purchases.

问题是，我的SKPaymentTransactionObserver是一个特定的视图控制器，如果我打开时它不可见itms-services://链接委托方法将不会被调用。

对此我能做什么？我想我必须检测用户是否来自应用程序商店才能推送正确的视图控制器，但我不知道如何做。我现在能想到的唯一其他选择是使应用程序代理成为SKPaymentTransactionObserver，但这看起来真的很麻烦，当我尝试时我无法让它工作。还有其他办法吗？

这是我做的一个类，可以帮助您实现您想要的，只需复制下面的代码并将其粘贴到一个新文件中，然后您就可以简单地访问该类StoreManager.shared到您想要访问的任何方法/变量。

1- 要启动该课程，只需从您的didFinishLaunchingWithOptions StoreManager.shared.Begin()然后添加支付观察者。

import Foundation
import StoreKit


class StoreManager: NSObject{

    /**
     Initialize StoreManager and load subscriptions SKProducts from Store
     */
    static let shared = StoreManager()

    func Begin() {
        print("StoreManager initialized"))
    }

    override init() {
        super.init()

        // Add pyament observer to payment qu
        SKPaymentQueue.default().add(self)
    }

    func requestProductWithID(identifers:Set<String>){

        if SKPaymentQueue.canMakePayments() {
            let request = SKProductsRequest(productIdentifiers:
                identifers)
            request.delegate = self
            request.start()
        } else {
            print("ERROR: Store Not Available")
        }
    }

    func buyProduct(product: SKProduct) {

        print("Buying \(product.productIdentifier)...")
        let payment = SKPayment(product: product)
        SKPaymentQueue.default().add(payment)
    }

    func restorePurchases() {

        SKPaymentQueue.default().restoreCompletedTransactions()
    }
}

// MARK:
// MARK: SKProductsRequestDelegate

//The delegate receives the product information that the request was interested in.
extension StoreManager:SKProductsRequestDelegate{

    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {

        var products = response.products as [SKProduct]

        var buys = [SKProduct]()

        if (products.count > 0) {
            for i in 0 ..< products.count {
                let product = products[i]
                print("Product Found: ",product.localizedTitle)
            }
        } else {
            print("No products found")
        }

        let productsInvalidIds = response.invalidProductIdentifiers

        for product in productsInvalidIds {
            print("Product not found: \(product)")
        }
    }

    func request(_ request: SKRequest, didFailWithError error: Error) {
        print("Something went wrong: \(error.localizedDescription)")
    }
}

// MARK:
// MARK: SKTransactions

extension StoreManager: SKPaymentTransactionObserver {

    public func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction in transactions {
            switch (transaction.transactionState) {
            case .purchased:
                completeTransaction(transaction: transaction)
                break
            case .failed:
                failedTransaction(transaction: transaction)
                break
            case .restored:
                restoreTransaction(transaction: transaction)
                break
            case .deferred:
                // TODO show user that is waiting for approval

                break
            case .purchasing:
                break
            }
        }
    }

    private func completeTransaction(transaction: SKPaymentTransaction) {

        print("completeTransaction...")

        deliverPurchaseForIdentifier(identifier: transaction.payment.productIdentifier)
        SKPaymentQueue.default().finishTransaction(transaction)
    }

    private func restoreTransaction(transaction: SKPaymentTransaction) {


        guard let productIdentifier = transaction.original?.payment.productIdentifier else { return }

        print("restoreTransaction... \(productIdentifier)")


        deliverPurchaseForIdentifier(identifier: productIdentifier)
        SKPaymentQueue.default().finishTransaction(transaction)
    }

    private func failedTransaction(transaction: SKPaymentTransaction) {

        if let error = transaction.error as NSError? {
            if error.domain == SKErrorDomain {
                // handle all possible errors
                switch (error.code) {
                case SKError.unknown.rawValue:
                    print("Unknown error")

                case SKError.clientInvalid.rawValue:
                    print("client is not allowed to issue the request")

                case SKError.paymentCancelled.rawValue:
                    print("user cancelled the request")

                case SKError.paymentInvalid.rawValue:
                    print("purchase identifier was invalid")

                case SKError.paymentNotAllowed.rawValue:
                    print("this device is not allowed to make the payment")

                default:
                    break;
                }
            }

        }

        SKPaymentQueue.default().finishTransaction(transaction)
    }

    private func deliverPurchaseForIdentifier(identifier: String?) {

        guard let identifier = identifier else { return }

    }
}

//In-App Purchases App Store
extension StoreManager{

    func paymentQueue(_ queue: SKPaymentQueue, shouldAddStorePayment payment: SKPayment, for product: SKProduct) -> Bool {
        return true

        //To hold
        //return false

        //And then to continue
        //SKPaymentQueue.default().add(savedPayment)
    }
}