2d sprite animation with swift

ViewController.swift

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var animView: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        animView.setAnimSpritesheet("player.png", rows: 3, cols: 7, fps: 12)
        animView.animationRepeatCount = 0;
        animView.startAnimating()
    }

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

typealias ImageData = CIImage
extension UIImageView {
    func setAnimSpritesheet(fileName:String, rows:Int, cols:Int, fps:Int) -> Void {
        if (rows > 0 && cols > 0) {
            if let src:UIImage = UIImage(named:fileName)! {
                if let ci_src:ImageData = ImageData.init(image: src)! {
                    let context = CIContext(options:nil)
                
                    let regionW:Int = Int(Int(src.size.width)/cols)
                    let regionH:Int = Int(Int(src.size.height)/rows)
                    var x = 0, y = 0
                    
                    var regs:[UIImage] = [UIImage]()
                    
                    if (regionH > 0 && regionW > 0) {
                        for _ in 1 ... rows {
                            for _ in 1 ... cols {
                                let cgimg = context.createCGImage(ci_src, fromRect: CGRect(x: x, y: y, width: regionW, height: regionH))
                                let uiimg = UIImage.init(CGImage: cgimg)
                                regs.append(uiimg)
                                x += regionW
                            }
                            x = 0
                            y += regionH
                        }
                        self.animationImages = regs
                        
                        let totalFrames = rows*cols
                        let dur:Double = Double(totalFrames)/Double(fps)
                        self.animationDuration = dur
                    }
                    
                    self.image = regs.last
                }
            }
        }
    }
}