AVCodeReader-outputdelegate.swift

extension AVCodeReader: AVCaptureMetadataOutputObjectsDelegate {
    func metadataOutput(_ captureOutput: AVCaptureMetadataOutput,
                        didOutput metadataObjects: [AVMetadataObject],
                        from connection: AVCaptureConnection) {
        guard let readableCode = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
              let code = readableCode.stringValue else {
             return
        }

        //Vibrate the phone
        AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
        stopReading()

        didRead?(code)
    }
}