如何从二维码SWIFT 4中检索所有数据 [英] How to retrieve all data from QR Code Swift 4

问题描述

在SWIFT 4中检索和显示有关二维码的所有信息时遇到问题。

我使用了带有文本扩展名的二维码生成器，我在其中添加了

{"number":"[phone]","amount":"50"}

在我的函数中调用和显示信息

func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) 
{
    if metadataObjects != nil && metadataObjects.count != 0
    {
        let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject

            if metadataObj.type == AVMetadataObject.ObjectType.qr
            {
                let info = HPPayMoneySuccessModel(titlePage: "Payment", imageInfo: "confirm_checked2", titleDescription: "Congratulations your transaction has been successfully completed", numberString: metadataObj.stringValue!, amountString: metadataObj.stringValue!, buttonTerminate: "OK")

                let segueViewController = HPPayMoneySuccessViewController.init(nibName: "HPPayMoneySuccessViewController", bundle: nil, payMoneySuccessViewModel: info) 

                self.navigationController?.pushViewController(segueViewController, animated: true)

                self.session.stopRunning()
            }
    }  
}

他以{"number":"[phone]","amount":"50"}这样的字符串向我获取信息，但我只想要[phone]中的[phone]和amountString中的50

请帮帮我。

推荐答案

您需要

guard let stringValue = metadataObj.stringValue else { return }    
if let res = try? JSONSerialization.jsonObject(with:Data(stringValue.utf8), options: []) as? [String:String] ,let fin = res {
    guard let number = fin["number"] , let amount = fin["amount"]  else { return }
    print(number)
    print(amount)
}

---

或

if let res = try? JSONDecoder().decode(Root.self, from: Data(stringValue.utf8)) {
    print(res.number)
    print(res.amount) 
}

struct Root : Decodable {
    let number,amount:String
}

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