iOS / Swift - Helper class for showing a simple dialog

OkAlert.swift

import UIKit

class OkAlert {

    class func show(inViewController viewController: UIViewController, title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
        viewController.presentViewController(alert, animated: true, completion: nil)
    }

    class func showUnknownErrorAlert(inViewController viewController: UIViewController) {
        OkAlert.show(inViewController: viewController, title: "Unknown Error", message: "An Unknown error occurred")
    }

}