CIFilter - Invert the photo color by built-in filter

//Updated December 22, 2014:
//Keep the photo orientation.

//Updated December 30, 2014
//Remove the error: BSXPCMessage received error for message: Connection interrupted
//Modify this: CIContext(options:[kCIContextUseSoftwareRenderer: true])

import UIKit

class ViewController: UIViewController,UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet weak var picture: UIImageView!

    

    @IBAction func photoAlbum(sender: AnyObject) {

        if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum)) {

            var pickerController = UIImagePickerController()

            pickerController.delegate = self

            self.presentViewController(pickerController, animated: true, completion: nil)

        }

    }

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

        

        let uiPictureSelected = info[UIImagePickerControllerOriginalImage] as UIImage

        let myOrientation : UIImageOrientation = uiPictureSelected.imageOrientation //Keep the photo orientation.

        let ciPictureSelected = CIImage(image:uiPictureSelected)

        var myFilter = CIFilter(name: "CIColorInvert")

        myFilter.setValue(ciPictureSelected, forKey: kCIInputImageKey)

        

        let ciOutputImage = myFilter.outputImage

        

        let ciContext = CIContext(options:[kCIContextUseSoftwareRenderer: true])

        let cgOutputImage = ciContext.createCGImage(ciOutputImage, fromRect: ciOutputImage.extent())

        

        let uiOutputImage = UIImage(CGImage: cgOutputImage, scale: 1, orientation: myOrientation)

        self.picture.image = uiOutputImage

        

        picker.dismissViewControllerAnimated(true, completion: nil)

    }

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    }