使用Swift通过应用内购买获得捐赠

我计划实施应用内购买，作为应用开发的支持。我在AppStore connect中制作了一个可消费的IAP，我使用了以下代码

    @IBAction func supportDevelopmentButtonHasBeenTapped(_ sender: Any) {
    if SKPaymentQueue.canMakePayments() {
        let paymentReq = SKMutablePayment()
        paymentReq.productIdentifier = productID
        SKPaymentQueue.default().add(paymentReq)
    } else {
        print("user cannot make payment")
    }
}

这个功能是：

    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
    for transaction in transactions {
        if transaction.transactionState == .purchased {
            let thanksAlert = UIAlertController(title: "Thanks!", message: "Thanks For Your Support", preferredStyle: UIAlertController.Style.alert)
            thanksAlert(UIAlertAction(title: "Back", style: UIAlertAction.Style.default, handler: nil))
            self.present(thanksAlert, animated: true, completion: nil)
            return 
            
        } else if transaction.transactionState == .failed {
            print("")
        }
    }
}

我的问题是用户不能多次购买，我如何才能让用户支持他想要的内容？

我认为您需要调用“transaction.transactionState==.purchased”

SKPaymentQueue.default().finishTransaction(transaction)