之前写过oc版本的无限滚动轮播图，现在来一个swift版本全部使用snapKit布局,数字还是pageConrrol样式可选
enum typeStyle: Int {
case pageControl
case label
}
效果图：
代码：
//
// TYCarouselView.swift
// hxquan-swift
//
// Created by Tiny on 2018/11/12.
// Copyright © 2018年 hxq. All rights reserved.
// 轮播图
import UIKit
let ImgPlaceHolder = UIImage(named: "picture")
enum typeStyle: Int {
case pageControl
case label
}
class TYCarouselCell: UICollectionViewCell {
var url: String = ""{
didSet{
let cacheImg = SDImageCache.shared().imageFromDiskCache(forKey: url)
imgView.contentMode = .center
imgView.sd_setImage(with: URL(string: url),placeholderImage:cacheImg ?? ImgPlaceHolder) { [unowned self] (image, error, _, _) in
if image != nil && error == nil{
self.imgView.contentMode = .scaleAspectFill
}
}
}
}
lazy var imgView: UIImageView = {
let imgView = UIImageView()
imgView.layer.masksToBounds = true
imgView.contentMode = .center
imgView.image = ImgPlaceHolder
return imgView
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupUI()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupUI()
}
func setupUI(){
contentView.addSubview(imgView)
imgView.snp.makeConstraints { (make) in
make.edges.equalToSuperview()
}
}
}
class TYCarouselView: UIView {
var style: typeStyle = .pageControl{
didSet{
if style == .pageControl{
if pageControl.superview == nil{
addSubview(pageControl)
pageControl.snp.makeConstraints { (make) in
make.centerX.equalToSuperview()
make.bottom.equalToSuperview().offset(-10)
}
}
if label.superview != nil{
label.removeFromSuperview()
}
}else{
if label.superview == nil{
addSubview(label)
label.snp.makeConstraints { (make) in
make.right.equalToSuperview().offset(-20)
make.bottom.equalToSuperview().offset(-20)
}
}
if pageControl.superview != nil{
pageControl.removeFromSuperview()
}
}
}
}
/// 定时器是否开启
var isTimerEnable = true
fileprivate let maxsection: Int = 100
/// 滚动间隔
public let scroInterval: TimeInterval = 4
private var selectonBlock: ((Int)->Void)?
public var images = [String]() {
didSet{
//重写images set方法
//更新数据源
collectionView.reloadData()
if style == .pageControl {
pageControl.numberOfPages = images.count
}else{
if oldValue.count == 0{
label.attributedText = labelAttrText(1)
}
label.isHidden = images.count == 0
}
if isTimerEnable && !images.isEmpty{
timerStart()
}
}
}
lazy var pageControl: UIPageControl = {
let pageControl = UIPageControl()
pageControl.sizeToFit()
return pageControl
}()
lazy var label: UILabel = {
let label = UILabel()
label.font = UIFont.systemFont(ofSize: 12)
label.textColor = UIColor.white
label.attributedText = labelAttrText(0)
label.isHidden = true
return label
}()
fileprivate lazy var collectionView: UICollectionView = { [unowned self] in
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.backgroundColor = UIColor.white
collectionView.showsVerticalScrollIndicator = false
collectionView.showsHorizontalScrollIndicator = false
collectionView.delegate = self
collectionView.dataSource = self
collectionView.isPagingEnabled = true
collectionView.register(TYCarouselCell.self, forCellWithReuseIdentifier: "TYCarouselCell")
return collectionView
}()
fileprivate lazy var timer: Timer = { [unowned self] in
let timer = Timer(timeInterval: scroInterval, target: self, selector: #selector(timerInterval), userInfo: nil, repeats: true)
RunLoop.current.add(timer, forMode: .common)
return timer
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupUI()
}
convenience init(frame: CGRect,selectonBlock: ((Int)->Void)?){
self.init(frame: frame)
self.selectonBlock = selectonBlock
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
private func setupUI(){
addSubview(collectionView)
collectionView.snp.makeConstraints { (make) in
make.edges.equalToSuperview()
}
addSubview(pageControl)
pageControl.snp.makeConstraints { (make) in
make.bottom.equalToSuperview().offset(-10)
make.centerX.equalToSuperview()
}
}
@objc func timerInterval(){
//取当前idnexPath
if let currentIndexPath = collectionView.indexPathsForVisibleItems.last{
//先让collectionViev滚动到中间
let currentIndexPathReset = IndexPath(row: currentIndexPath.row, section: maxsection/2)
collectionView.scrollToItem(at: currentIndexPathReset, at: .left, animated: false)
//让当前indexPath.row++
var row = currentIndexPath.row + 1
var nextsection = currentIndexPathReset.section
if row >= images.count{
row = 0
nextsection = nextsection + 1
}
if style == .pageControl {
pageControl.currentPage = row
}else{
label.attributedText = labelAttrText(row+1)
}
let nextIndexPath = IndexPath(row: row, section:nextsection)
collectionView.scrollToItem(at: nextIndexPath, at: .left, animated: true)
}
}
private func timerStart(){
if !timer.isValid {
timer.fire()
}
}
private func timerPause(){
if timer.isValid {
timer.invalidate()
}
}
private func labelAttrText(_ index: Int) -> NSAttributedString{
let lf = "(index)"
let rt = "(images.count)"
let str = lf + "／" + rt
let attr = NSMutableAttributedString(string: str)
attr.setAttributes([NSAttributedString.Key.foregroundColor : UIColor.red], range: NSRange(location: 0, length: 1))
return attr
}
}
extension TYCarouselView: UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout{
func numberOfSections(in collectionView: UICollectionView) -> Int {
return maxsection
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TYCarouselCell", for: indexPath) as! TYCarouselCell
cell.url = images[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize( self.bounds.size.width, height: self.bounds.size.height)
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
selectonBlock?(indexPath.row)
}
//结束滚动
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let index = Int(scrollView.contentOffset.x / self.bounds.size.width + 0.5) % images.count
if style == .pageControl {
pageControl.currentPage = index
}else{
label.attributedText = labelAttrText(index+1)
}
if(isTimerEnable){
//定时器启动
if timer.isValid {
timer.fireDate = Date.init(timeIntervalSinceNow: scroInterval)
}
}
}
//拖动
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
if isTimerEnable{
//定时器暂停
if timer.isValid {
timer.fireDate = Date.distantFuture
}
}
}
}
使用方法：
lazy var carouselView: TYCarouselView = { [unowned self] in
let carouselView = TYCarouselView(frame: .zero, selectonBlock: { (index) in
print("(index)")
})
carouselView.style = .label
carouselView.layer.masksToBounds = true
carouselView.layer.cornerRadius = 10
return carouselView
}()
override func viewDidLoad() {
super.viewDidLoad()
//添加到父视图
view.addSubview(carouselView)
//设置约束
carouselView.snp.makeConstraints { (make) in
make.left.equalTo(15)
make.right.equalTo(-15)
make.top.equalTo(10)
make.height.equalTo(170)
}
//设置数据源
var imgs = [String]()
for _ in 0..<5{
imgs.append("图url")
}
self.carouselView.images = imgs
}