What should I do if my dismiss does not work after a QRcode scan?

I am going to scan the `QR code` in the `webView`.

`QR code` scans well and data can be read,

but the problem is, the camera screen won't close after scanning. I'm running a `dismiss()` function.

webView Load

@IBOutlet weak var indicator: UIImageView!
@IBOutlet var wkWebView: WKWebView!
...
let config = WKWebViewConfiguration()
       
        contentController.add(self, name: "native")
       
        config.userContentController = contentController
       
        wkWebView = WKWebView(frame: wkWebView.frame, configuration: config)
       
        wkWebView.uiDelegate = self
        wkWebView.navigationDelegate = self
       
        view.addSubview(wkWebView)
        view.addSubview(indicator)
let localFilePath = Bundle.main.url(forResource: webUrl, withExtension: "html")
let myRequest = URLRequest(url: localFilePath)
wkWebView.load(myRequest)

QRCode Scan

var captureSession: AVCaptureSession!
var previewLayer: AVCaptureVideoPreviewLayer!


   override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        if (captureSession?.isRunning == false) {
            captureSession.startRunning()
        }
    }


    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)


        if (captureSession?.isRunning == true) {
            captureSession.stopRunning()
        }
    }


    func qrcodeScan(){
        view.backgroundColor = UIColor.black
        captureSession = AVCaptureSession()


        guard let videoCaptureDevice = AVCaptureDevice.default(for: .video) else { return }
        let videoInput: AVCaptureDeviceInput


        do {
            videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
        } catch {
            return
        }


        if (captureSession.canAddInput(videoInput)) {
            captureSession.addInput(videoInput)
        } else {
            failed()
            return
        }


        let metadataOutput = AVCaptureMetadataOutput()


        if (captureSession.canAddOutput(metadataOutput)) {
            captureSession.addOutput(metadataOutput)


            metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
            metadataOutput.metadataObjectTypes = [.qr]
        } else {
            failed()
            return
        }


        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        previewLayer.frame = view.layer.bounds
        previewLayer.videoGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)


        captureSession.startRunning()
    }
   
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        captureSession.stopRunning()


        if let metadataObject = metadataObjects.first {
            guard let readableObject = metadataObject as? AVMetadataMachineReadableCodeObject else { return }
            guard let stringValue = readableObject.stringValue else { return }
            AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
            found(code: stringValue)
        }


        self.dismiss(animated: true, completion: nil)
    }


    func found(code: String) {
        Log.Info(code)
    }
   


    func failed() {
        captureSession = nil
    }


    override var prefersStatusBarHidden: Bool {
        return true 
    }




    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .portrait
    }

As you can see from my code, I'm trying to get the camera window down after reading the `QR code`.

But the camera screen is still on the frozen screen. No matter how long I wait, I can't see the web view screen. What's the problem?