Nu jäklar!

import Foundation
import AVFoundation

//@objc(CodeScannerViewManager)
//class CodeScannerViewManager: RCTViewManager {
//
//  @objc
//  override func view() -> UIView! {
//    let captureView = CodeScannerViewController()
//    return captureView.view
//  }
//
//  @objc
//  override static func requiresMainQueueSetup() -> Bool {
//    return true
//  }
//
//}

@objc(CodeScannerViewManager)
class CodeScannerViewManager: RCTViewManager {

  var captureSession = AVCaptureSession()
  var videoPreviewLayer: AVCaptureVideoPreviewLayer?

  @objc
  override func view() -> UIView! {

    print("view")

    let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: .video, position: .back)

    guard let captureDevice = discoverySession.devices.first else {
      print("No device found")
      return UIView()
    }

    do {
      let input = try AVCaptureDeviceInput(device: captureDevice)
      captureSession.addInput(input)

      let videoMetaDataOutput = AVCaptureMetadataOutput()
      captureSession.addOutput(videoMetaDataOutput)

      videoMetaDataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)

      videoMetaDataOutput.metadataObjectTypes = [.qr]

      videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
      videoPreviewLayer?.videoGravity = .resizeAspectFill

      let view = UIView()
      view.layer.addSublayer(videoPreviewLayer!)

      DispatchQueue.global(qos: .userInitiated).async {
        self.captureSession.startRunning()
      }

      return view

    } catch {
      print(error)
      return UIView()
    }

  }

  @objc
  override static func requiresMainQueueSetup() -> Bool {
    return true
  }

}

extension CodeScannerViewManager: AVCaptureMetadataOutputObjectsDelegate {
  func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
    if let metadataObject = metadataObjects.first {
      guard let readableObject = metadataObject as? AVMetadataMachineReadableCodeObject else { return }
      guard let stringValue = readableObject.stringValue else { return }
      AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
      CodeScannerEvents.emitter.send(code: stringValue)
    }
  }
}