Swift 3 -- 真正的定时无限轮播

复制可以直接使用

//图片轮播组件代理协议
protocol DBScrollBannerViewDelegate{
//获取数据源
func handleTapAction(index:Int)->Void
}

//图片轮播组件控制器
class DBScrollBannerView: UIView,UIScrollViewDelegate{
//代理对象
var delegate : DBScrollBannerViewDelegate!

//屏幕宽度
let kScreenWidth = UIScreen.main.bounds.size.width

//当前展示的图片索引
var currentIndex : Int = 0

//数据源
var dataSource : [String]?

//用于轮播的左中右三个image（不管几张图片都是这三个imageView交替使用）
var leftImageView , middleImageView , rightImageView : UIImageView?

//放置imageView的滚动视图
var scrollerView : UIScrollView?

//scrollView的宽和高
var scrollerViewWidth : CGFloat?
var scrollerViewHeight : CGFloat?

//页控制器（小圆点）
var pageControl : UIPageControl?

//自动滚动计时器
var autoScrollTimer:Timer?

func relodataData(ImagesArr:[String]){
    //获取数据
    self.dataSource =  ImagesArr
    //设置imageView
    self.configureImageView()
    //设置页控制器
    self.configurePageController()
    if ImagesArr.count > 1 {
        //设置自动滚动计时器
        self.configureAutoScrollTimer()
    }else{
        self.scrollerView?.isScrollEnabled = false
    }

}

init(frame: CGRect, ImagesArr:[String]) {
    super.init(frame: frame)
    
    //获取并设置scrollerView尺寸
    self.scrollerViewWidth = frame.width
    self.scrollerViewHeight = frame.height
    
    //获取数据
    self.dataSource =  ImagesArr
    //设置scrollerView
    self.configureScrollerView()
    //设置imageView
    self.configureImageView()
    //设置页控制器
    self.configurePageController()
    if ImagesArr.count > 1 {
        //设置自动滚动计时器
        self.configureAutoScrollTimer()
    }else{
        self.scrollerView?.isScrollEnabled = false
    }
    self.backgroundColor = UIColor.gray
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

//设置scrollerView
func configureScrollerView(){
    self.scrollerView = UIScrollView(frame: CGRect(x: 0,y: 0,
                                                   width: self.scrollerViewWidth!, height: self.scrollerViewHeight!))
    self.scrollerView?.delegate = self
    self.scrollerView?.contentSize = CGSize(width: self.scrollerViewWidth! * 3,
                                            height: self.scrollerViewHeight!)
    //滚动视图内容区域向左偏移一个view的宽度
    self.scrollerView?.contentOffset = CGPoint(x: self.scrollerViewWidth!, y: 0)
    self.scrollerView?.isPagingEnabled = true
    self.scrollerView?.bounces = false
    self.addSubview(self.scrollerView!)
    
}
//设置imageView
func configureImageView(){
    self.leftImageView = UIImageView(frame: CGRect(x: 0, y: 0,
                                                   width: self.scrollerViewWidth!, height: self.scrollerViewHeight!))
    self.middleImageView = UIImageView(frame: CGRect(x: self.scrollerViewWidth!, y: 0,
                                                     width: self.scrollerViewWidth!, height: self.scrollerViewHeight! ));
    self.rightImageView = UIImageView(frame: CGRect(x: 2*self.scrollerViewWidth!, y: 0,
                                                    width: self.scrollerViewWidth!, height: self.scrollerViewHeight!));
    self.scrollerView?.showsHorizontalScrollIndicator = false
    
    //设置初始时左中右三个imageView的图片（分别时数据源中最后一张，第一张，第二张图片）
    if(self.dataSource?.count != 0){
        self.touchViewAction()
        resetImageViewSource()
    }else{
        // 如果没有图片，站位图
        self.middleImageView?.image = UIImage(named: "img_05")
    }
    
    self.scrollerView?.addSubview(self.leftImageView!)
    self.scrollerView?.addSubview(self.middleImageView!)
    self.scrollerView?.addSubview(self.rightImageView!)
}

//设置页控制器
func configurePageController() {
    self.pageControl = UIPageControl(frame: CGRect(x: kScreenWidth/2-60,
                                                   y: self.scrollerViewHeight! - 20, width: 120, height: 20))
    self.pageControl?.numberOfPages = (self.dataSource?.count)!
    self.pageControl?.isUserInteractionEnabled = false
    self.addSubview(self.pageControl!)
}

//设置自动滚动计时器
func configureAutoScrollTimer() {
    
    //设置一个定时器，每三秒钟滚动一次
    autoScrollTimer = Timer.scheduledTimer(timeInterval: 3, target: self,
                                           selector: #selector(letItScroll),
                                           userInfo: nil, repeats: true)
}

//计时器时间一到，滚动一张图片
func letItScroll(){
    let offset = CGPoint(x: 2*scrollerViewWidth!, y: 0)
    self.scrollerView?.setContentOffset(offset, animated: true)
}

//每当滚动后重新设置各个imageView的图片
func resetImageViewSource() {
    //当前显示的是第一张图片
    if self.currentIndex == 0 {
        self.leftImageView?.image = UIImage(named: self.dataSource!.last!)
        self.middleImageView?.image = UIImage(named: self.dataSource!.first!)
        let rightImageIndex = (self.dataSource?.count)!>1 ? 1 : 0 //保护
        self.rightImageView?.image = UIImage(named: self.dataSource![rightImageIndex])
    }
        //当前显示的是最好一张图片
    else if self.currentIndex == (self.dataSource?.count)! - 1 {
        self.leftImageView?.image = UIImage(named: self.dataSource![self.currentIndex-1])
        self.middleImageView?.image = UIImage(named: self.dataSource!.last!)
        self.rightImageView?.image = UIImage(named: self.dataSource!.first!)
    }
        //其他情况
    else{
        self.leftImageView?.image = UIImage(named: self.dataSource![self.currentIndex-1])
        self.middleImageView?.image = UIImage(named: self.dataSource![self.currentIndex])
        self.rightImageView?.image = UIImage(named: self.dataSource![self.currentIndex+1])
    }
}

func touchViewAction(){
    //添加组件的点击事件
    let tap = UITapGestureRecognizer(target: self,
                                     action: #selector(handleTapAction(_:)))
    self.addGestureRecognizer(tap)
}
//点击事件响应
func handleTapAction(_ tap:UITapGestureRecognizer)->Void{
       self.delegate.handleTapAction(index: self.currentIndex)
}


//scrollView滚动完毕后触发
func scrollViewDidScroll(_ scrollView: UIScrollView) {
    //获取当前偏移量
    let offset = scrollView.contentOffset.x
    
    if(self.dataSource?.count != 0){
        
        //如果向左滑动（显示下一张）
        if(offset >= self.scrollerViewWidth!*2){
            //还原偏移量
            scrollView.contentOffset = CGPoint(x: self.scrollerViewWidth!, y: 0)
            //视图索引+1
            self.currentIndex = self.currentIndex + 1
            
            if self.currentIndex == self.dataSource?.count {
                self.currentIndex = 0
            }
        }
        
        //如果向右滑动（显示上一张）
        if(offset <= 0){
            //还原偏移量
            scrollView.contentOffset = CGPoint(x: self.scrollerViewWidth!, y: 0)
            //视图索引-1
            self.currentIndex = self.currentIndex - 1
            
            if self.currentIndex == -1 {
                self.currentIndex = (self.dataSource?.count)! - 1
            }
        }
        
        //重新设置各个imageView的图片
        resetImageViewSource()
        //设置页控制器当前页码
        self.pageControl?.currentPage = self.currentIndex
    }
}

//手动拖拽滚动开始
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
    //使自动滚动计时器失效（防止用户手动移动图片的时候这边也在自动滚动）
    autoScrollTimer?.invalidate()
}

//手动拖拽滚动结束
func scrollViewDidEndDragging(_ scrollView: UIScrollView,
                              willDecelerate decelerate: Bool) {
    //重新启动自动滚动计时器
    configureAutoScrollTimer()
    
}

}

使用 签代理 实现代理方法

  bannerView = DBScrollBannerView.init(frame: .init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 300), ImagesArr: ["img_01","img_02","img_03","img_04","img_05"])
    bannerView.delegate = self
    self.view.addSubview(bannerView)
    // 更新数据方法
    bannerView.relodataData(ImagesArr: ["",""])

func handleTapAction(index: Int) {
    
    print("==========\(index)")
}

demo 地址