pageControl与ScrollView的联合使用

pageControl和scrollVIE可以联合使用，scrollview主要有几个属性 一个contentSize 是总共的视图的容量大小，每个view的x坐标要不相同 随后实现scrollview的协议，当scrollview翻页的时候，来实现pagecontrol的翻页，读出他的contentoffset事偏移量 为一个CGPoint 读出后，x的坐标除以viewwidth便可以实现pagecontrol实现的不同了，随后在pagecontrol中添加目标时间，当值发生改变时，引起事件，随后导致scrollview翻页效果的产生即可，要记住scrollview的pageControl的属性一定要设置为true,否则无法实现翻页的效果 下面看具体的代码

import UIKitclass ViewController: UIViewController,UIScrollViewDelegate {    var scrollView:UIScrollView!    var pageControl:UIPageControl!    var viewHeight:CGFloat = 0    var viewWidth:CGFloat = 0    override func viewDidLoad() {        super.viewDidLoad()               // Do any additional setup after loading the view, typically from a nib.        //初始化        viewHeight = self.view.frame.size.height        viewWidth = self.view.frame.size.width        //创建屏幕滚动的视图        self.scrollView = UIScrollView(frame: CGRectMake(0,0,viewWidth,viewHeight))        //包含的大小 高度不变 宽度变为原来的3倍        self.scrollView.contentSize = CGSize(width: viewWidth * 3, height: viewHeight)        //随着页面变化器而变化        scrollView.pagingEnabled = true        //设置代理        scrollView.delegate = self        //设置图片 还要设置每个imageView的位置关系        let image1 = UIImage(named: "1")        var imageView1 = UIImageView(image: image1)        imageView1.frame = CGRectMake(0, 0, viewWidth, viewHeight)        let image2 = UIImage(named: "2")        var imageView2 = UIImageView(image: image2)        imageView2.frame = CGRectMake(viewWidth, 0, viewWidth, viewHeight)        let image3 = UIImage(named: "3")        var imageView3 = UIImageView(image: image3)        imageView3.frame = CGRectMake(viewWidth * 2,viewHeight, viewWidth, viewHeight)        //添加三个视图        scrollView.addSubview(imageView3)        scrollView.addSubview(imageView2)        scrollView.addSubview(imageView1)        self.view.addSubview(scrollView)        //初始化分屏控制器        var pageControlHeight:CGFloat = 38.0        var pageControlWidth:CGFloat = 120.0        //创建大小        var pageControlFrame = CGRectMake((viewWidth - pageControlWidth) / 2, (viewHeight - pageControlHeight), pageControlWidth, pageControlHeight)        pageControl = UIPageControl(frame: pageControlFrame)        //背景颜色        pageControl.backgroundColor = UIColor.blackColor()        //透明度        pageControl.alpha = 0.5        pageControl.numberOfPages = 3        pageControl.currentPage = 0        pageControl.addTarget(self, action: "changePage:", forControlEvents: .ValueChanged)        self.view.addSubview(pageControl)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }//实现代理    func scrollViewDidScroll(scrollView: UIScrollView) {        var offset = scrollView.contentOffset        //目前的页数        pageControl.currentPage = Int(offset.x) / Int(viewWidth)    }    func changePage(sender:AnyObject) {        //设置一个动画        UIView.animateWithDuration(0.3, animations: {            var whichPage = self.pageControl.currentPage            self.scrollView.contentOffset = CGPointMake(CGFloat(whichPage) * self.viewWidth, 0)        })    }}