class BannerView: UIView,UIScrollViewDelegate{
//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 imageViews:Array = Array<UIImageView>()
//图⽚集合
private var images:Array<String> = []
private var type:ImageType?
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6秒可以⾃⼰修改
var interval:Double = 6
private var startOffsetX:CGFloat = 0
override func layoutSubviews() {
super.layoutSubviews()
}
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 = self.bounds.width
height = self.bounds.height
scrollView.frame = self.bounds
scrollView.contentSize = CGSize(width:width * CGFloat(images.count +
2),height:height)
scrollView.contentOffset = CGPoint(x:width,y:0)
scrollView.isUserInteractionEnabled = true
scrollView.isPagingEnabled = true
scrollView.showsHorizontalScrollIndicator = false
scrollView.delegate = self
self.addSubview(scrollView)
var image = UIImageView()
image.frame = CGRect(x:0,y:0,width:width,height:height)
image.contentMode = .scaleToFill
image.isUserInteractionEnabled = true
setImage(image: image, index: images.count - 1)
scrollView.addSubview(image)
for i in 1 ... images.count{
let image = UIImageView()
image.frame = CGRect(x:width *
CGFloat(i),y:0,width:width,height:height)
image.contentMode = .scaleToFill
image.isUserInteractionEnabled = true
scrollView.addSubview(image)
setImage(image: image, index: i - 1)
addTapGesWithImage(image: image)
}
image = UIImageView()
image.frame = CGRect(x:width * CGFloat(images.count +
1),y:0,width:width,height:height)
image.contentMode = .scaleToFill
image.isUserInteractionEnabled = true
scrollView.addSubview(image)
setImage(image: image, index: 0)
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
self.addSubview(pageControl)
if(isAuto){
openTimer()
}
setCurrent(currIndex: 0)
}
private func setImage(image:UIImageView,index:Int){
if(type == .Image){
image.image = UIImage.init(named:images[index])
}else{
image.setMyImage(url: images[index])
}
}
func setCurrent(currIndex:Int) {
if(currIndex < 0){
self.currIndex = images.count - 1
}else{
self.currIndex = currIndex
}
pageControl.currentPage = self.currIndex
scrollView.setContentOffset(CGPoint(x:width * CGFloat(self.currIndex +
1),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 = .scaleToFill
// 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) {
startOffsetX = scrollView.contentOffset.x
closeTimer()
}
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate
decelerate: Bool) {
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
if(scrollView.contentOffset.x > startOffsetX){
currIndex = (currIndex + 1) % images.count
}else{
currIndex = (currIndex - 1) % images.count
}
setCurrent(currIndex: currIndex)
openTimer()
}
func openTimer(){
if(isAuto){
closeTimer()
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
}
}
enum ImageType{
case Image //本地图⽚
case URL //URL
}