//
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// BannerView.swift
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// OKProject
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//
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// Created by 无故事王国 on 2022/5/7.
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// Copyright © 2022 yangwang. All rights reserved.
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//
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import UIKit
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import UIKit
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class BannerView: UIView,UIScrollViewDelegate{
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//图⽚⽔平放置到scrollView上
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private var scrollView:UIScrollView = UIScrollView()
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//⼩圆点标识
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private var pageControl:UIPageControl = UIPageControl()
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private var imageViews:Array = Array<UIImageView>()
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//图⽚集合
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private var images:Array<String> = []
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private var type:ImageType?
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private var currIndex = 0
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private var clickBlock :(Int)->Void = {index in}
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private var changeClouse:((Int,Int)->Void)?
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private var timer:Timer?
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// 默认⾃动播放 设置为false只能⼿动滑动
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var isAuto = true
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// 轮播间隔时间 默认6秒可以⾃⼰修改
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var interval:Double = 5
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private var startOffsetX:CGFloat = 0
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override func layoutSubviews() {
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super.layoutSubviews()
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pageControl.center = CGPoint(x:width/2,y:height - CGFloat(15))
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scrollView.contentSize = CGSize(width:width * CGFloat(images.count +
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2),height:height)
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}
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public func setImages(images:Array<String>,type:ImageType
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= .Image,imageClickBlock:@escaping (Int) -> Void) {
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self.type = type
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self.images = images
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self.clickBlock = imageClickBlock
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self.initLayout()
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}
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public func changeAtIndex(_ clouse:@escaping (Int,Int)->Void){
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changeClouse = clouse
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}
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private func initLayout(){
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if(self.images.count == 0){
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return
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}
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if self.images.count == 1{
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scrollView.isScrollEnabled = false
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closeTimer()
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}
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width = self.bounds.width
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height = self.bounds.height
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scrollView.frame = self.bounds
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scrollView.contentSize = CGSize(width:width * CGFloat(images.count +
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2),height:height)
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scrollView.contentOffset = CGPoint(x:width,y:0)
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scrollView.isUserInteractionEnabled = true
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scrollView.isPagingEnabled = true
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scrollView.showsHorizontalScrollIndicator = false
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scrollView.delegate = self
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self.addSubview(scrollView)
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var image = UIImageView()
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image.frame = CGRect(x:0,y:0,width:width,height:height)
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image.contentMode = .scaleAspectFill
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image.maskToBounds = true
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image.isUserInteractionEnabled = true
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setImage(image: image, index: images.count - 1)
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scrollView.addSubview(image)
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for i in 1 ... images.count{
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let image = UIImageView()
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image.frame = CGRect(x:width *
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CGFloat(i),y:0,width:width,height:height)
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image.contentMode = .scaleAspectFill
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image.maskToBounds = true
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image.isUserInteractionEnabled = true
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scrollView.addSubview(image)
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setImage(image: image, index: i - 1)
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addTapGesWithImage(image: image)
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}
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image = UIImageView()
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image.frame = CGRect(x:width * CGFloat(images.count +
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1),y:0,width:width,height:height)
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image.contentMode = .scaleAspectFill
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image.maskToBounds = true
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image.isUserInteractionEnabled = true
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scrollView.addSubview(image)
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setImage(image: image, index: 0)
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// pageControl.center = CGPoint(x:width/2,y:height - CGFloat(15))
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pageControl.isEnabled = true
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pageControl.numberOfPages = images.count
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pageControl.currentPageIndicatorTintColor = .white
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pageControl.pageIndicatorTintColor = .gray.withAlphaComponent(0.5)
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pageControl.isUserInteractionEnabled = false
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self.addSubview(pageControl)
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pageControl.snp.makeConstraints { make in
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make.bottom.equalToSuperview().offset(-20)
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make.width.equalTo(width/2)
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make.height.equalTo(height - 15)
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make.centerX.equalToSuperview()
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}
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if(isAuto){
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openTimer()
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}
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setCurrent(currIndex: 0)
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}
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private func setImage(image:UIImageView,index:Int){
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if(type == .Image){
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image.image = UIImage.init(named:images[index])
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}else{
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image.load(url: images[index])
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image.contentMode = .scaleAspectFill
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image.maskToBounds = true
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}
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}
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func setCurrent(currIndex:Int) {
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if(currIndex < 0){
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self.currIndex = images.count - 1
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}else{
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self.currIndex = currIndex
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}
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pageControl.currentPage = self.currIndex
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scrollView.setContentOffset(CGPoint(x:width * CGFloat(self.currIndex +
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1),y:0), animated: true)
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changeClouse?(currIndex,images.count)
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}
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//给图⽚添加点击⼿势
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private func addTapGesWithImage(image:UIImageView) {
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let tap = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))
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image.isUserInteractionEnabled = true //让控件可以触发交互事件
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image.contentMode = .scaleAspectFill
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// image.clipsToBounds = true //超出⽗控件的部分不显示
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image.addGestureRecognizer(tap)
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}
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//点击图⽚，调⽤block
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@objc func tap(_ ges:UITapGestureRecognizer) {
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clickBlock((ges.view?.tag)!)
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}
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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}
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func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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startOffsetX = scrollView.contentOffset.x
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closeTimer()
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}
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func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate
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decelerate: Bool) {
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}
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func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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if(scrollView.contentOffset.x > startOffsetX){
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currIndex = (currIndex + 1) % images.count
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}else{
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currIndex = (currIndex - 1) % images.count
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}
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setCurrent(currIndex: currIndex)
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openTimer()
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}
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func openTimer(){
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if(isAuto){
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closeTimer()
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timer = Timer.scheduledTimer(timeInterval: interval, target: self, selector:
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#selector(startAutoScroll), userInfo: nil, repeats: true)
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}
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}
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func closeTimer(){
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if(timer != nil){
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timer?.invalidate()
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timer = nil
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}
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}
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@objc func startAutoScroll(){
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if(isDisplayInScreen()){
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setCurrent(currIndex: (currIndex + 1) % images.count)
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}
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}
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func isDisplayInScreen() -> Bool{
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if(self.window == nil){
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return false
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}
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return true
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}
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}
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enum ImageType{
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case Image //本地图⽚
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case URL //URL
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}
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