Animation Demo

import UIKit

class ViewController: UIViewController {

    let containerView = UIView()
    let redView = UIView()
    let blueView = UIView()
//    let greenView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.containerView.frame = CGRectMake(60, 60, 200, 200)
        self.view.addSubview(self.containerView)

        self.redView.frame = CGRectMake(0, 0, 200, 200)
        self.blueView.frame = CGRectMake(0, 0, 200, 200)

        self.redView.backgroundColor = UIColor.redColor()
        self.blueView.backgroundColor = UIColor.blueColor()

        self.containerView.addSubview(self.redView)
//        self.containerView.addSubview(self.blueView)
    }

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

    @IBAction func submit(sender: AnyObject) {
        let views = (frontView: self.redView, backView: self.blueView)

        let transtion = UIViewAnimationOptions.TransitionCurlUp

        UIView.transitionWithView(self.containerView, duration: 1.0, options: transtion, animations: {
            views.frontView.removeFromSuperview()
            self.containerView.addSubview(views.backView)
            }, completion: {finished in})
    }

}