[英]Code for capturing QR Code doesn't seem working well in Xcode8 and Swift3
[英]Swift3: I would like to function read and count QR code
我正在構建一個QR碼閱讀器應用程序。 我寫了一個函數來讀取和計數QR碼。 我可以顯示動態按鈕標題的計數; 但是,QR碼的值不像1、2、3那樣計數。顯示自然QR值。
我的ViewController:
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:[])
}
}
}
請試試 :
var qrCodes:[String] = [] // declare it as member variable in the class
然后打電話
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"
}
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