Swipe to show another VC [Swift]

override func viewDidLoad() {
    super.viewDidLoad()

    let swipeGesture:UISwipeGestureRecognizer = UISwipeGestureRecognizer(
        target: self,
        action: Selector("actionShowSecondViewController:")
        )
    swipeGesture.numberOfTouchesRequired = 1;
    swipeGesture.direction = .Up

    self.view.userInteractionEnabled = true
    self.view.addGestureRecognizer(swipeGesture)

}

func actionShowSecondViewController(sender:UISwipeGestureRecognizer) {
    switch sender.state {
        case .Ended:
            showSecondViewController()
            break
        default:
            break
    }
}

private func showSecondViewController() {
    let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil) as UIStoryboard
    let secondViewController:SecondViewController = (storyboard.instantiateViewControllerWithIdentifier("SecondViewController")
                            as? SecondViewController)!
    showDetailViewController(secondViewController, sender: nil)
}