import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var yearofbirth: UITextField!

    @IBOutlet weak var image: UIImageView!

    let offset = 4

    override func viewDidLoad() {

        super.viewDidLoad()

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

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    @IBAction func okTapped(sender: AnyObject) {

        yearofbirth.resignFirstResponder()

        if let year = yearofbirth.text.toInt(){

            var imageNumber = (year - offset) % 12

            image.image = UIImage(named: String(imageNumber))

        }

        else {

            // notify the user

        }

    }

}