iOS图片轮播UIScrollView+UIPageControl

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////  ViewController.swift//  PictureLoop////  Created by Benjamin on 12/3/15.//  Copyright  2015 Benjamin. All rights reserved.//

import UIKit

class ViewController: UIViewController,UIScrollViewDelegate {

@IBOutlet weak var pageControl1: UIPageControl!    @IBOutlet weak var scrollView1: UIScrollView!    let images = ["s1", "s2", "s3"]    var timer = NSTimer()    //图片的宽    var imageWidth:CGFloat!    //图片的高    var imageHeight:CGFloat!

override func viewDidLoad() {        super.viewDidLoad()    }

/**     该方法计算了真实地scrollView地frame的大小     详见：http://benjaminwhx.com/2015/12/03/IOS%E9%94%99%E8%AF%AF%E6%80%BB%E7%BB%93/     */    override func viewDidLayoutSubviews() {        super.viewDidLayoutSubviews()        let imageY: CGFloat = 0        imageWidth = self.scrollView1.frame.size.width        imageHeight = self.scrollView1.frame.size.height        for i in 0..<images.count {            let imageX = imageWidth * CGFloat(i)            let imageView = UIImageView(image: UIImage(named: images[i]))            imageView.frame = CGRectMake(imageX, imageY, imageWidth, imageHeight)            self.scrollView1.addSubview(imageView)        }        let contentWidth = CGFloat(images.count) * imageWidth        //设置scrollView的滚动范围        self.scrollView1.contentSize = CGSizeMake(contentWidth, 0)

//要分页        self.scrollView1.pagingEnabled = true

self.scrollView1.delegate = self

//取消水平垂直滚动条        scrollView1.showsHorizontalScrollIndicator = false        scrollView1.showsVerticalScrollIndicator = false

self.pageControl1.numberOfPages = images.count        self.pageControl1.currentPage = 0        addTimer()    }

//轮回下张图片    func nextImage() {        var currentPage = self.pageControl1.currentPage        if currentPage == images.count-1 {            currentPage = 0        } else {            currentPage++        }        let offsetX = imageWidth * CGFloat(currentPage)        self.scrollView1.contentOffset = CGPointMake(offsetX, 0)    }

//图片滚动时调用,设置pageControl的当前page    //(手动滑动 + 自动滚动 + 点击pageControl)都会触发    func scrollViewDidScroll(scrollView: UIScrollView) {        let offsetX = self.scrollView1.contentOffset.x        self.pageControl1.currentPage = Int(offsetX / imageWidth)    }

@IBAction func pageValueChanged(sender: UIPageControl) {        //用户点击点触发        print("value changed, current page: \(sender.currentPage)")        let offsetX = imageWidth * CGFloat(sender.currentPage)        self.scrollView1.contentOffset = CGPointMake(offsetX, 0)    }

//定时    func addTimer() {        self.timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "nextImage", userInfo: nil, repeats: true)        //添加到运行循环        NSRunLoop.currentRunLoop().addTimer(self.timer, forMode: NSRunLoopCommonModes)    }

//关闭定时器    func removeTimer() {        self.timer.invalidate()    }

//开始拖拽    func scrollViewWillBeginDragging(scrollView: UIScrollView) {        removeTimer()    }

//停止拖拽    func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {        addTimer()    }

}