swift实现自动轮播图效果 swift实现自动轮播图效果（UIScrollView+UIPageControl+Timer）
稻草人11223 人气:3想了解swift实现自动轮播图效果（UIScrollView+UIPageControl+Timer）的相关内容吗，稻草人11223在本文为您仔细讲解swift实现自动轮播图效果的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：swift,轮播图，下面大家一起来学习吧。
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：
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