Swift － 利用UIScrollView 实现轮播图

看过网上很多轮播图的Demo，都是通过UITableView 或者 UICollectionView来实现的，  心血来潮用UIScrollView来实现一下，没做代码优化，只是个Demo。欢迎拍砖

先赋上代码源码：

////  TimerScrollView.swift//  时光网Swift////  Created by 亓大志 on 16/4/20.//  Copyright © 2016年 亓大志. All rights reserved.//import UIKitprotocol TimerScrollViewDelegate {    func scrollToIndexOfPage(index:Int)}class TimerScrollView: UIView,UIScrollViewDelegate {    var count : Int = 0    var timer : NSTimer!    var timerDelegate:TimerScrollViewDelegate?    var scrollView : UIScrollView?    var pageCT : UIPageControl?        /*    params:         array : 图片URL集合        contentOffSetIndex : 偏移位置    */    func configScrollView(array:NSArray,contentOffsetIndex:Int){        count = array.count        self.clipsToBounds = false        self.backgroundColor = UIColor.whiteColor()        scrollView = UIScrollView(frame: self.bounds)        scrollView!.delegate = self        scrollView!.contentSize = CGSizeMake(CGFloat(array.count+2) * self.frame.size.width, self.frame.size.height)        scrollView!.pagingEnabled = true        scrollView!.showsHorizontalScrollIndicator = false        scrollView!.showsVerticalScrollIndicator = false        self.addSubview(scrollView!)        createImageViews(array,contentOffsetIndex:contentOffsetIndex)                configPageControll(contentOffsetIndex)                timerBegin()    }        func createImageViews(array:NSArray,contentOffsetIndex:Int){        for i in 0 ..< array.count+2{            var url : String!            if i == 0 {                url = array[array.count-1] as! String            }else if i == array.count + 1 {                url = array[0] as! String            }else {                url = array[i-1] as! String            }                                    let URL : NSURL = NSURL(string: url)!            let imageView = UIImageView(frame: CGRectMake(CGFloat(i)*self.frame.size.width, 0, self.frame.size.width, self.frame.size.height))            //图片的加载需要依赖于框架，                        scrollView!.addSubview(imageView)        }                scrollView!.contentOffset = CGPointMake(CGFloat(contentOffsetIndex+1)*self.frame.size.width, 0)    }        func configPageControll(currentPage:Int) {        pageCT = UIPageControl(frame: CGRectMake(0,self.frame.size.height-30.0,self.frame.size.width,15))        pageCT!.pageIndicatorTintColor = UIColor.grayColor()        pageCT!.currentPageIndicatorTintColor = UIColor.whiteColor()        pageCT!.numberOfPages = count        pageCT!.currentPage = currentPage        self.addSubview(pageCT!)    }        //开启    func timerBegin() {        if timer != nil {            timer.invalidate()            timer = nil        }                timer = NSTimer.scheduledTimerWithTimeInterval(4, target: self, selector: Selector("timerRun:"), userInfo: nil, repeats: true)        NSRunLoop.mainRunLoop().addTimer(timer, forMode: NSRunLoopCommonModes)    }        //暂停    func timerSuspend() {        if timer != nil {            timer.invalidate()            timer = nil        }    }        func timerRun(runTimer:NSTimer) {        let offsetX = scrollView!.contentOffset.x        UIView.animateWithDuration(0.4, animations: { () -> Void in                self.scrollView!.contentOffset = CGPointMake(offsetX+self.frame.size.width, 0)            }) { (boolValue:Bool) -> Void in                self.resetContentOffset()        }            }        func scrollViewWillBeginDragging(scrollView: UIScrollView) {        timerSuspend()    }        func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {        timerBegin()    }        func scrollViewDidEndDecelerating(scrollView: UIScrollView) {        resetContentOffset()    }        func resetContentOffset(){        if scrollView!.contentOffset.x < self.frame.size.width {            scrollView!.contentOffset = CGPointMake(self.frame.size.width*CGFloat(count), 0)        }                if scrollView!.contentOffset.x > self.frame.size.width * CGFloat(count) {            scrollView!.contentOffset = CGPointMake(self.frame.size.width, 0)        }                let vc = self.timerDelegate as! UIViewController        if vc.respondsToSelector(Selector("scrollToIndexOfPage:")) {            let index = Int((scrollView!.contentOffset.x - self.frame.size.width) / self.frame.size.width)            pageCT?.currentPage = index            timerDelegate?.scrollToIndexOfPage(index)        }                    }}

GitHub地址：TimerForScrollView