AVCodeReader-Limit.swift

    private func isCodeInLimitBounds(codeReadable: AVMetadataMachineReadableCodeObject) -> Bool {

        if  let videoLayer = previewLayer as? AVCaptureVideoPreviewLayer,
            let transformedObj = videoLayer.transformedMetadataObject(for: codeReadable),
            let limitBounds = limitBounds {
            return limitBounds.contains(transformedObj.bounds)
        }
        //ignore 'failure' above
        return true
    }