我最近在我的项目中安装了pod StripeCardScan。我能够让它正常工作，但是，它不可能让STPPaymentCardTextField接受任何编程输入，从卡扫描或只是使用手动let语句。我在谷歌上搜索并回顾了几篇关于这方面的文章，但是我觉得我遗漏了一些东西。2我想知道我是否需要为这个类设置一个代理人？
下面是我尝试使用的代码，把扫描卡到号码字段：

cardScanSheet.present(from: self) { [weak self] result in
        var title = ""
        var message = ""
        
        switch result {
        case .completed(let card):
            title = "Scan Completed"
            message = card.pan
            let cardParams = STPPaymentMethodCardParams()
            cardParams.number = card.pan
            //cardParams.number = "4511554566354474".  <- Even when doing this manually, it still does not take
            self?.addCardView.cardField.paymentMethodParams.card = cardParams
            print("card [pam \(card.pan)")
        case .canceled:
            title = "Scan Canceled"
            message = "Canceled the scan"
        case .failed(let error):
            title = "Scan Failed"
            message = "Failed with error: \(error.localizedDescription)"
        }