效果图：

----------FirstPageViewController-----------

    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.brownColor()
        
    }

----------SecondPageViewController-----------

    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.purpleColor()
    }

----------ThirdPageViewController-----------

    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.blueColor()

    }

---------------PageViewController--------------------

//
//  PageControlViewController.swift
//

import UIKit

class PageControlViewController: UIViewController, UIScrollViewDelegate
{

    var pageControl: UIPageControl?
    var scrollView: UIScrollView?
    
    var isPageControlUsed = false
    
    var screenFrame :CGRect?
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        self.title = "UIPageControl"
        self.view.backgroundColor = UIColor.whiteColor()
        screenFrame = UIScreen.mainScreen().bounds
        let screenWidth = screenFrame!.width
        let screenHeight = screenFrame!.height
        
        var view = UIView(frame: CGRectMake(0, 0, screenWidth, 60))
        view.backgroundColor = UIColor.whiteColor()
        self.view.addSubview(view)
        
        scrollView = UIScrollView(frame: CGRectMake(0, 60, screenWidth, screenHeight - 60))
        pageControl = UIPageControl(frame: CGRectMake(0, screenHeight - 40, screenWidth, 40))
        scrollView!.pagingEnabled = true
        
        scrollView!.contentSize = CGSizeMake(screenWidth * 3, screenHeight - 60)
        let firstViewController = FirstPageViewController()
        firstViewController.view.frame = CGRectMake(0, 0, screenWidth, screenHeight - 60)
        let secondViewController = SecondPageViewController()
        secondViewController.view.frame = CGRectMake(screenWidth, 0, screenWidth, screenHeight - 60)
        let thirdViewController = ThirdPageViewController()
        thirdViewController.view.frame = CGRectMake(screenWidth * 2, 0, screenWidth, screenHeight - 60)
        
        scrollView!.addSubview(firstViewController.view)
        scrollView!.addSubview(secondViewController.view)
        scrollView!.addSubview(thirdViewController.view)
        
        scrollView!.delegate = self
        
        self.view.addSubview(scrollView!)
        
        pageControl!.numberOfPages = 3
        pageControl!.currentPage = 0
        pageControl!.addTarget(self, action: "pageDidChanged:", forControlEvents: UIControlEvents.ValueChanged)
        
        self.view.addSubview(pageControl!)
        
        installCodeBarBtn()
    }
    
    func pageDidChanged(obj : UIPageControl) -> Void
    {
        var currentPage = obj.currentPage
        var frame = scrollView!.frame
        frame.origin.x = (CGFloat)(currentPage) * frame.size.width
        
        scrollView!.scrollRectToVisible(frame, animated: true)
        isPageControlUsed = true
    }
    
    func scrollViewDidScroll(scrollView: UIScrollView)
    {
        if(!isPageControlUsed)
        {
            let pageWidth = scrollView.frame.size.width
            let page = floor((scrollView.contentOffset.x - pageWidth/2)/pageWidth) + 1
            pageControl!.currentPage = (Int)(page)
        }
    }
    
    func scrollViewDidEndDecelerating(scrollView: UIScrollView)
    {
        isPageControlUsed = false
    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }
    
    func installCodeBarBtn() -> Void
    {
        var rightBar = UIBarButtonItem(title: "Code", style: UIBarButtonItemStyle.Done, target: self, action: "toCodeViewPad")
        self.navigationItem.rightBarButtonItem = rightBar
    }
    
    func toCodeViewPad() -> Void
    {
        let codeViewController = PageCodeViewController()
        self.navigationController!.pushViewController(codeViewController, animated: true)
    }

}