gistfile1.swift

//MARK: AVCaptureMetadataOutputObjectsDelegate
    
func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {
    for metadata in metadataObjects {
        for barcodeType in self.allowedBarcodes {
            if metadata.type == barcodeType {
                let barcode = (metadata as AVMetadataMachineReadableCodeObject).stringValue as String?
                self.session.stopRunning()
                if self.delegate != nil {
                    self.delegate!.didScanBarcode(barcode!)
                }
                break
            }
        }
    }
}