本文实例为大家分享了swift实现自动轮播图效果的具体代码，供大家参考，具体内容如下
比较简单，原理就不说了，这里只做记录：
代码如下：
1、准备
var pageControl:UIPageControl? var myscrollView:UIScrollView? var myTimer:Timer? var mycurrentPage:NSInteger? var courses = [ ["name":"first","pic":"1.jpeg"], ["name":"second","pic":"2.jpeg"], ["name":"third","pic":"3.jpeg"] ]
2、内容的添加
//添加scrollview self.addScrollView() //添加图片 self.addImages() //添加pagecontrol self.addPageControl() mycurrentPage = 1 //添加定时器 self.setupTimer()
具体方法：
func addScrollView(){
self.myscrollView = UIScrollView() self.myscrollView?.frame = CGRect(x:0,y:0,width:kScreenWidth,height:kScreenHeight/2) self.myscrollView?.contentSize = CGSize(width:kScreenWidth*3,height:kScreenHeight/2) self.myscrollView?.showsHorizontalScrollIndicator = false self.myscrollView?.showsVerticalScrollIndicator = false self.myscrollView?.scrollsToTop = false self.myscrollView?.delegate = self self.myscrollView?.isPagingEnabled = true self.view.addSubview(self.myscrollView!) }
func addImages(){
let size = self.myscrollView?.bounds.size for (seq,course) in courses.enumerated() {
let page = UIView(frame:CGRect(x:0,y:64,width:kScreenWidth,height:kScreenHeight/2)) let imageView=UIImageView(image:UIImage(named:course["pic"]!)) imageView.frame = page.frame page.addSubview(imageView) page.backgroundColor = UIColor.gray let lab1 = UILabel(frame:CGRect(x:15,y:kScreenHeight/2-100,width:kScreenWidth-30,height:40)) lab1.textAlignment = .center lab1.backgroundColor = UIColor.red lab1.text = course["name"] page.addSubview(lab1) page.frame = CGRect(x:CGFloat(seq)*(size?.width)!,y:0,width:(size?.width)!,height:(size?.height)!) self.myscrollView?.addSubview(page) }
}
func addPageControl(){
self.pageControl = UIPageControl(frame:CGRect(x:kScreenWidth/2-50/2,y:kScreenHeight/2-40,width:50,height:35)) self.pageControl?.backgroundColor = UIColor.blue self.pageControl?.numberOfPages = courses.count self.view.addSubview(self.pageControl!) }
func setupTimer() {
self.myTimer = Timer.init(timeInterval: 2.0, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true) RunLoop.main.add(self.myTimer!, forMode: RunLoopMode.defaultRunLoopMode) // DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2) {
// self.myTimer?.fire()// }
}
func closeTimer(){
self.myTimer?.invalidate() self.myTimer = nil }
func timerAction(){
self.pageControl?.currentPage += mycurrentPage! if self.pageControl?.currentPage == 0 || self.pageControl?.currentPage == 2 {
mycurrentPage = -mycurrentPage! }
self.myscrollView?.contentOffset = CGPoint(x:CGFloat(kScreenWidth)*CGFloat((pageControl?.currentPage)!),y:0) }
3、一些代理方法的实现，手动拖动的时候，销毁定时器，节省内存
internal func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let page = Int(scrollView.contentOffset.x/scrollView.frame.size.width) self.pageControl?.currentPage = page }
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.closeTimer() }
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
self.setupTimer() }
func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView) {
self.pageControl?.currentPage = Int(scrollView.contentOffset.x/kScreenWidth) }
效果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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