【iOS】Swift实现图片轮播

使用Swift简单的封装了一个图片轮播视图，如果有人觉得实用的话可以直接拖入项目中简单调用就可以实现图片轮播。由于接触Swift也不久，有很多不足一处，希望与大神交流学习。^_

• 封装的图片轮播View

import UIKit
class XHAdLoopView: UIView {
    private var pageControl : UIPageControl?
    private var imageScrollView : UIScrollView?
    private var currentPage: NSInteger?
    /*******************  重写get方法 **************/
    private var currentImgs = NSMutableArray()
    private var currentImages :NSMutableArray? {
        get{
            currentImgs.removeAllObjects()
            let count = self.images!.count
            var i = NSInteger(self.currentPage!+count-1)%count
            currentImgs.addObject(self.images![i])
            currentImgs.addObject(self.images![self.currentPage!])
            i = NSInteger(self.currentPage!+1)%count
            currentImgs.addObject(self.images![i])
            return currentImgs
        }
    }
    /************************************************/
    private var images: NSArray?
    private var autoPlay : Bool?
    private var isFromNet : Bool?
    private var delay : NSTimeInterval?
    var delegate:XHAdLoopViewDelegate?
    override init(frame: CGRect) {
        super.init(frame: frame)
    } 
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    convenience init(frame:CGRect ,images:NSArray, autoPlay:Bool, delay:NSTimeInterval, isFromNet:Bool){
        self.init(frame: frame)
        self.images = images;
        self.autoPlay = autoPlay
        self.isFromNet = isFromNet
        self.delay = delay
        self.currentPage = 0
        createImageScrollView()
        createPageView()
        if images.count<2{
            self.autoPlay = false
            pageControl?.hidden = true
        }
        if self.autoPlay == true {
            startAutoPlay()
        }
    }
    //创建图片滚动视图
    private func createImageScrollView(){
        if images?.count == 0 {
            return
        }
        imageScrollView = UIScrollView(frame: self.bounds)
        imageScrollView?.showsHorizontalScrollIndicator = false
        imageScrollView?.showsVerticalScrollIndicator=false
        imageScrollView?.bounces = false
        imageScrollView?.delegate = self
        imageScrollView?.contentSize = CGSizeMake(self.bounds.width*3, 0)
        imageScrollView?.contentOffset = CGPointMake(self.frame.width, 0)
        imageScrollView?.pagingEnabled = true
        self.addSubview(imageScrollView!)
        for index in 0..<3 {
            let imageView = UIImageView(frame: CGRectMake(self.bounds.width*CGFloat(index), 0, self.bounds.width, self.bounds.height))
            imageView.userInteractionEnabled = true
            imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(XHAdLoopView.imageViewClick)))  
            if self.isFromNet == true {   
            }
            else{
                imageView.image = UIImage(named: self.currentImages![index] as! String);
            }
            imageScrollView?.addSubview(imageView)
        }
    }
    //创建pageControl视图
    private func createPageView(){
        if images?.count == 0 {
            return
        }
        let pageW: CGFloat = 80
        let pageH: CGFloat = 25
        let pageX: CGFloat = self.bounds.width - pageW
        let pageY: CGFloat = self.bounds.height - pageH
        pageControl = UIPageControl(frame: CGRectMake(pageX, pageY, pageW, pageH))
        pageControl?.numberOfPages = images!.count
        pageControl?.currentPage = 0
        pageControl?.userInteractionEnabled = false
        self.addSubview(pageControl!)  
    }
    private func startAutoPlay() {
        self.performSelector(#selector(XHAdLoopView.nextPage), withObject: nil, afterDelay: delay!)
    }
    func nextPage() {
        NSObject.cancelPreviousPerformRequestsWithTarget(self, selector: #selector(XHAdLoopView.nextPage), object: nil)
        imageScrollView!.setContentOffset(CGPointMake(2 * self.frame.width, 0), animated: true)
        self.performSelector(#selector(XHAdLoopView.nextPage), withObject: nil, afterDelay: delay!)
    }
    
    //每次图片滚动时刷新图片
    private func refreshImages(){
        for i in 0..<imageScrollView!.subviews.count {
            let imageView = imageScrollView!.subviews[i] as! UIImageView
            if self.isFromNet == true {
                //图片来自网络
            }
            else{
                imageView.image = UIImage(named: self.currentImages![i] as! String);
            }
        }
        imageScrollView!.contentOffset = CGPointMake(self.frame.width, 0)
    }
    //图片点击
    func imageViewClick(){
        if self.delegate != nil && (self.delegate?.respondsToSelector(#selector(XHAdLoopViewDelegate.adLoopView(_:IconClick:)))) != nil {
            self.delegate!.adLoopView(self, IconClick: currentPage!)
        }
    }
}
extension XHAdLoopView : UIScrollViewDelegate{
    func scrollViewDidEndDecelerating(scrollView: UIScrollView) {      scrollView.setContentOffset(CGPointMake(self.frame.width, 0), animated: true)
    }
    func scrollViewDidScroll(scrollView: UIScrollView) {
        let x = scrollView.contentOffset.x
        let width = self.frame.width
        if x >= 2*width {
            currentPage = (currentPage!+1) % self.images!.count
            pageControl!.currentPage = currentPage!
            refreshImages()
        }
        if x <= 0 {
            currentPage = (currentPage!+self.images!.count-1) % self.images!.count
            pageControl!.currentPage = currentPage!
            refreshImages()
        }
    }
}
//自定义代理方法
@objc protocol XHAdLoopViewDelegate:NSObjectProtocol {
    func adLoopView(adLoopView:XHAdLoopView ,IconClick index:NSInteger)
}

• 调用方法实现图片轮播

import UIKit
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let frame = CGRectMake(0, 20, view.bounds.width, view.bounds.width*0.6)
        let imageView = ["2.jpg","3.jpg","4.jpg"]
        let loopView = XHAdLoopView(frame: frame, images: imageView, autoPlay: true, delay: 3, isFromNet: false)
        loopView.delegate = self
        view.addSubview(loopView)   
    }  
}
//遵循协议代理，调用代理方法
extension ViewController : XHAdLoopViewDelegate {
    func adLoopView(adLoopView: XHAdLoopView, IconClick index: NSInteger) {
        print(index)
    }
}

• 效果图

  
  
• Demo下载链接
  https://github.com/huahua0809/XHAdScrollView