Swift version of an Objective-C UIPageControl tutorial (https://www.youtube.com/watch?v=abRCY5St_EM)

Swift UIPageControl

//
//  WelcomeViewController.swift
//
//  Created by Juan Miguel Calcano on 2/2/15.
//  Copyright (c) 2015 Juan Miguel Calcano. All rights reserved.
//  Swift version of an Objective-C UIPageControl tutorial (https://www.youtube.com/watch?v=abRCY5St_EM)
//  UPDATE: swipe UIPageControl

import UIKit

class WelcomeViewController: UIViewController, UIScrollViewDelegate, UIGestureRecognizerDelegate {
  @IBOutlet weak var callOutLabel: UILabel!
  @IBOutlet weak var callOutPageControl: UIPageControl? = UIPageControl()
  var callOutMsg:[String] = []
  var currentMsg:String = String()
  //swipe
  var indexPage = 3
  
  override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        self.callOutMsg = ["Discover what's trendy within your friend", "Find things trendy near to you", "Share with style"]
        self.currentMsg = callOutMsg[0]
        self.callOutLabel?.text = currentMsg
        
        //swipe
        //PageControl Swipe
        var swipeRight = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:")
        swipeRight.direction = UISwipeGestureRecognizerDirection.Right
        swipeRight.numberOfTouchesRequired = 1
        self.view.addGestureRecognizer(swipeRight)
        
        var swipeLeft = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:")
        swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
        swipeLeft.numberOfTouchesRequired = 1
        self.view.addGestureRecognizer(swipeLeft)
  }
  
  @IBAction func callOutPageControlChanged(sender: AnyObject) {
        let selectedPage = self.callOutPageControl?.currentPage
        self.callOutLabel?.text = callOutMsg[selectedPage!]
    }
  
  //swipe
  func respondToSwipeGesture(gesture: UIGestureRecognizer) {
      var totalPage = self.callOutMsg.count
      var selectedPage = self.callOutPageControl?.currentPage
      
      if let swipeGesture = gesture as? UISwipeGestureRecognizer {
          switch swipeGesture.direction {
              case UISwipeGestureRecognizerDirection.Right:
                  indexPage++
              case UISwipeGestureRecognizerDirection.Left:
                  indexPage--
              default:
                  break
          }
          indexPage = (indexPage < 0) ? (totalPage - 1):
          indexPage % totalPage
          print(indexPage)
          self.callOutLabel?.text = callOutMsg[indexPage]
      }
    }

}