Ios Swift3:我想功能读取和计算二维码
我正在构建一个二维码阅读器应用程序。我写了一个函数来读取和计算二维码。我可以显示动态按钮标题的计数;但是,QR码值并不像1、2、3那样计算。显示自然QR值 我的ViewController:Ios Swift3:我想功能读取和计算二维码,ios,swift3,count,xcode8,qr-code,Ios,Swift3,Count,Xcode8,Qr Code,我正在构建一个二维码阅读器应用程序。我写了一个函数来读取和计算二维码。我可以显示动态按钮标题的计数;但是,QR码值并不像1、2、3那样计算。显示自然QR值 我的ViewController: class LentScanViewController: QRScannerViewController { var device_name = "" var countNum = 0 @IBOutlet weak var LentButton: UIButton! @IBAction func le
class LentScanViewController: QRScannerViewController {
var device_name = ""
var countNum = 0
@IBOutlet weak var LentButton: UIButton!
@IBAction func lentButton(_ sender: Any) {
performSegue(withIdentifier: "toLentTable",sender: device_name)
}
override func viewDidLoad() {
super.viewDidLoad()
}
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
if metadataObjects == nil || metadataObjects.count == 0 {
qrCodeFrameView?.frame = CGRect.zero
return
}
let metadataObj = metadataObjects[0] as! AVMetadataMachineReadableCodeObject
if metadataObj.type == AVMetadataObjectTypeQRCode {
let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj)
qrCodeFrameView?.frame = barCodeObject!.bounds
if metadataObj.stringValue != nil {
device_name = metadataObj.stringValue
countNum = countNum + 1
LentButton.setTitle(String(countNum) + "Lent", for:[])
}
}
}
请尝试:
var qrCodes:[String] = [] // declare it as member variable in the class
然后打电话
if metadataObj.stringValue != nil {
let device_name = metadataObj.stringValue
if !qrCodes.contains(device_name!) {
qrCodes.append(device_name!)
}
countNum = countNum + 1
messageLabel.text = String(countNum) + "Lent"
}
请尝试:
var qrCodes:[String] = [] // declare it as member variable in the class
然后打电话
if metadataObj.stringValue != nil {
let device_name = metadataObj.stringValue
if !qrCodes.contains(device_name!) {
qrCodes.append(device_name!)
}
countNum = countNum + 1
messageLabel.text = String(countNum) + "Lent"
}
非常感谢。但此代码是显示metadataObj值。我想如果扫描一个二维码显示1。另一个扫描显示2。就像这个视频编辑了答案。请查收,谢谢。但此代码是显示metadataObj值。我想如果扫描一个二维码显示1。另一个扫描显示2。就像这个视频编辑了答案。请查收。