image filter template w/ swift

//
//  TopViewController.swift
//
//  Created by Yusuke Sugomori on 9/9/14.
//  Copyright (c) 2014 Yusuke Sugomori. All rights reserved.
//

import UIKit

class TopViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


        let screenSize: CGRect = UIScreen.mainScreen().bounds

        let screenWidth = screenSize.width
        let screenHeight = screenSize.height

        let image = UIImage(named: "test.jpg")

        // Core Image context
        let ciContext = CIContext(options: nil)

        // CIImage, think of a CIImage as image data for processing, nothing is displayed or can be displayed at this point
        let coreImage = CIImage(image: image)

        // pick the filter
        let filter = CIFilter(name: "CIPhotoEffectTransfer")

        // pass image as input
        filter.setValue(coreImage, forKey: kCIInputImageKey)

        // retrieve the processed image
        let filteredImageData = filter.valueForKey(kCIOutputImageKey) as CIImage

        // returns a Quartz image from the Core Image context
        let filteredImageRef = ciContext.createCGImage(filteredImageData, fromRect: filteredImageData.extent())

        // final UIImage ready to be displayed
        let filteredImage = UIImage(CGImage: filteredImageRef)


        let imageView = UIImageView(image: filteredImage)

        imageView.frame = CGRectMake(0, 0, screenWidth, screenHeight)
        imageView.contentMode = UIViewContentMode.ScaleAspectFit

        self.view.addSubview(imageView)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}