swift 广告轮播图

 

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import UIKit import Kingfisher   class 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<String> = []     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<String>,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)

        }