Generate Barcode from a string

Barcode.swift

import UIKit

class Barcode {
    
    class func fromString(string : String, barcodeMode: BarcodeMode) -> UIImage? {
        let data = string.dataUsingEncoding(NSASCIIStringEncoding)
        let filter = CIFilter(name: barcodeMode.filterName)
        filter?.setValue(data, forKey: "inputMessage")
        guard let outputImage = filter?.outputImage else {
            return UIImage()
        }
        
        let transform = CGAffineTransformMakeScale(5.0, 5.0)
        let output = outputImage.imageByApplyingTransform(transform)
        let context = CIContext(options: nil)
        let newImage = UIImage (CGImage: context.createCGImage(output, fromRect: output.extent))
        return newImage
    }
    
}

enum BarcodeMode {
    case Barcode
    case QRCode
    
    var filterName :String  {
        switch self{
        case .Barcode:
            return "CICode128BarcodeGenerator"
        case .QRCode:
            return "CIQRCodeGenerator"
        }
    }
}