如何从 QR Code Swift 4 中检索所有数据

Question

我在检索和显示有关 Swift 中的 QR 码的所有信息时遇到问题 4.

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":"+33688888888","amount":"50"}

在我的函数中调用并显示信息

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()
            }
    }  
}

他给我的信息是像 {"number":"+33688888888","amount":"50"} 这样的字符串，但我只想 numberString 中的 +33688888888 和 amountString 中的 50

请帮帮我。

Answer 1

你需要

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
}

如何从 QR Code Swift 4 中检索所有数据

How to retrieve all data from QR Code Swift 4

qr-code

ios

swift