import UIKitimport Kingfisherclass BannerView: UIView,UIScrollViewDelegate{        enum ImageType{        case Image     //本地图片        case URL       //URL    }        //图片水平放置到scrollView上    private var scrollView:UIScrollView = UIScrollView()    //小圆点标识    private var pageControl:UIPageControl = UIPageControl()    private var center_image:UIImageView = UIImageView()    private var first_image:UIImageView = UIImageView()    private var second_image:UIImageView = UIImageView()    //图片集合    private var images:Array
     
       = []    private var type:ImageType = .Image        private var width:CGFloat = 0    private var height:CGFloat = 0        private var currIndex = 0    private var clickBlock :(Int)->Void = {index in}        private var timer:Timer?        // 默认自动播放 设置为false只能手动滑动    var isAuto = true    // 轮播间隔时间 默认4秒可以自己修改    var interval:Double = 4        override func layoutSubviews() {        super.layoutSubviews()//        self.initLayout()    }        public func setImages(images:Array
      
       ,type:ImageType = .Image,imageClickBlock:@escaping (Int) -> Void) {        self.type = type        self.images = images        self.clickBlock = imageClickBlock        self.initLayout()    }        private func initLayout(){        if(self.images.count == 0){            return        }                width = frame.size.width        height = frame.size.height                scrollView.frame = self.bounds        scrollView.contentSize = CGSize(width:width * CGFloat(3),height:height)        scrollView.contentOffset = CGPoint(x:width,y:0)        scrollView.isUserInteractionEnabled = true        scrollView.isPagingEnabled = true        scrollView.showsHorizontalScrollIndicator = false        scrollView.delegate = self        addSubview(scrollView)                first_image.frame = CGRect(x:0,y:0,width:width,height:height)        first_image.contentMode = .scaleAspectFill        first_image.isUserInteractionEnabled = true        scrollView.addSubview(first_image)                center_image.frame = CGRect(x:width,y:0,width:width,height:height)        center_image.contentMode = .scaleAspectFill        center_image.isUserInteractionEnabled = true        scrollView.addSubview(center_image)                second_image.frame = CGRect(x:width * 2.0,y:0,width:width,height:height)        second_image.contentMode = .scaleAspectFill        second_image.isUserInteractionEnabled = true        scrollView.addSubview(second_image)                        pageControl.center = CGPoint(x:width/2,y:height - CGFloat(15))        pageControl.isEnabled = true        pageControl.numberOfPages = images.count        pageControl.currentPageIndicatorTintColor = UIColor.green        pageControl.pageIndicatorTintColor = UIColor.gray        pageControl.isUserInteractionEnabled = false        addSubview(pageControl)                //当前显示的只有 center_image 其他两个只是用来增加滑动时效果而已，不需要添加点击事件        addTapGesWithImage(image: center_image)        if(isAuto){            openTimer()        }        setCurrent(currIndex: 0)    }        func setCurrent(currIndex:Int) {        self.currIndex = currIndex                if(type == .Image){            center_image.image = UIImage.init(named:images[currIndex])            first_image.image = UIImage.init(named:images[(currIndex - 1 + images.count) % images.count])            second_image.image = UIImage.init(named:images[(currIndex + 1) % images.count])        }else{            center_image.setMyImage(URL: NSURL(string: images[currIndex]))            first_image.setMyImage(URL: NSURL(string: images[(currIndex - 1 + images.count) % images.count]))            second_image.setMyImage(URL: NSURL(string: images[(currIndex + 1) % images.count]))        }        center_image.tag = currIndex        pageControl.currentPage = currIndex        scrollView.setContentOffset(CGPoint(x:width,y:0), animated: false)    }        //给图片添加点击手势    private func addTapGesWithImage(image:UIImageView) {        let tap = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))        image.isUserInteractionEnabled = true //让控件可以触发交互事件        image.contentMode = .scaleAspectFill        image.clipsToBounds = true //超出父控件的部分不显示        image.addGestureRecognizer(tap)    }        //点击图片，调用block    @objc func tap(_ ges:UITapGestureRecognizer) {        clickBlock((ges.view?.tag)!)    }        func scrollViewDidScroll(_ scrollView: UIScrollView) {            }        func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {        closeTimer()    }        func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {        openTimer()    }        func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {        if(scrollView.contentOffset.x > 0){            currIndex = (currIndex + 1) % images.count        }else{            currIndex = (currIndex - 1 + images.count) % images.count        }        setCurrent(currIndex: currIndex)    }        func openTimer(){        if(isAuto){            if(timer == nil){                 timer = Timer.scheduledTimer(timeInterval: interval, target: self, selector: #selector(startAutoScroll), userInfo: nil, repeats: true)            }                    }    }        func closeTimer(){        if(timer != nil){            timer?.invalidate()            timer = nil        }    }            @objc func startAutoScroll(){        if(isDisplayInScreen()){            setCurrent(currIndex: (currIndex + 1) % images.count)        }    }        func isDisplayInScreen() -> Bool{        if(self.window == nil){            return false        }        return true    }    }extension UIImageView{    // Kingfisher的覆盖  好处：1.不用所有界面都去导入 2.如果KingfisherAPI更新或者更换图片加载库可以更方便一些，保持方法名和第一个参数不变，修改一下就能达到目的，比如修改为使用SDWebImage    public func setMyImage(URL: NSURL?,placeholderImage: Image? = nil,                                  optionsInfo: KingfisherOptionsInfo? = nil,                                  progressBlock: DownloadProgressBlock? = nil,                                  completionHandler: CompletionHandler? = nil){        kf.setImage(with: URL as? Resource,                           placeholder: placeholderImage,                           options: optionsInfo,                                  progressBlock: progressBlock,                                  completionHandler: completionHandler)    }}
      
     

　　

 

 

使用方法

@IBOutlet weak var bannerView: BannerView!

bannerView.setImages(images: ["ad01.jpg","ad02.jpg","ad03.jpg","ad04.jpg"]){ (index) in

            print(index)

        }