我正在使用RevenueCat进行订阅。当我进行测试购买时，它工作正常，但我有一个奇怪的问题。我有一个单独的“购买”按钮，当按下时，RevenueCat操作表出现。
如果我按下右上角的小x按钮来关闭它，或者在actionSheet的外部按下，在Purchases.shared.purchase内部，.purchaseCancelledError会被调用。但是如果我按下蓝色的订阅按钮，然后按下警报的Ok，按钮，什么都不会发生。没有回调被触发，我不知道用户购买了订阅。
我如何知道用户何时点击订阅，然后从You're All Set警报中按下OK按钮？

func purchaseButtonTapped() {

    let productID = "..."

    Purchases.shared.getOfferings { [weak self](offerings, error) in
        guard let _ = error else { return }

        for dict in offerings.all {
                
            let offering = dict.value
            let packages = offering.availablePackages
                
            if let indexOfItem = packages.firstIndex(where: { $0.storeProduct.productIdentifier == productID }) {
                    
                let pkg = packages[indexOfItem]
                    
                self?.showSystemActionSheet(for: pkg)
                break
            }
        }
    }
}

func showSystemActionSheet() {

    Purchases.shared.purchase(package: package) { (transaction, customerInfo, error, userCancelled) in

        if let error = error as? RevenueCat.ErrorCode {
            switch error {
            case .purchaseCancelledError: // *** using breakpoints this gets hit when I cancel or dismiss the actionSheet
                return
            case .productAlreadyPurchasedError, .operationAlreadyInProgressForProductError, .receiptInUseByOtherSubscriberError :
                print("purchase is active")
            case .purchaseNotAllowedError:
                print("purchases_not_allowed")
            case .purchaseInvalidError:
                print("invalid_purchase_check_payment_method")
            default: break
            }
            return
        }

        if userCancelled {
            return 
        }

        guard let customerInfo = customerInfo else { 
            return 
        }

        // after the user pressed Subscribe then pressed the OK button from the You're All Set alert, this print statement should get print/get hit with a break point but it never does
        print("the subscribe button and You're All Set alert was tapped")
    }
}

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