Swift-based ValueTransformer that converts CIImage to NSImage

CIImageToNSImageTransformer.swift

@objc class CIImageToNSImageTransformer: ValueTransformer {
   @objc public static func RegisterTransformer() {
      ValueTransformer.setValueTransformer(
         CIImageToNSImageTransformer(),
         forName: NSValueTransformerName("CIImageToNSImageTransformer")
      )
   }

   override class func transformedValueClass() -> AnyClass {
      return NSImage.self
   }

   override class func allowsReverseTransformation() -> Bool {
      return false
   }

   override func transformedValue(_ value: Any?) -> Any? {
      if let ciImage = value as? CIImage {
         let rep = NSCIImageRep(ciImage: ciImage)
         let updateImage = NSImage(size: rep.size)
         updateImage.addRepresentation(rep)
         return updateImage
      }
      return nil
   }
}