Swift UIScrollView滚动视图/无限循环滚动/自动滚动

//先签一下协议
class ViewController: UIViewController , UIScrollViewDelegate {

//Swift没有宏定义,只好定义常量来代替宏定义
let SCROLL_WIDTH = UIScreen.mainScreen().bounds.width
let SCROLL_HEIGHT = UIScreen.mainScreen().bounds.height

var scrollView :UIScrollView?     //轮播图
var pageC :UIPageControl?         //小点
var timer :NSTimer?               //定时器
var scArray :NSMutableArray?      //图片数组

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.

//图片数组
scArray = ["5.jpg","0.jpg","1.jpg","2.jpg","3.jpg","4.jpg","5.jpg","0.jpg"]

//初始化轮播图
scrollView = UIScrollView.init(frame: UIScreen.mainScreen().bounds)
//ScrollView背景颜色
scrollView?.backgroundColor = UIColor.cyanColor()
//ScrollView滚动量
scrollView?.contentSize = CGSizeMake(SCROLL_WIDTH * CGFloat((scArray?.count)!), SCROLL_HEIGHT)
//ScrollView偏移量
scrollView?.contentOffset = CGPointMake(SCROLL_WIDTH, 0)
//是否按页滚动
scrollView?.pagingEnabled = true
//是否显示水平滑条
scrollView?.showsHorizontalScrollIndicator = false
//协议
scrollView?.delegate = self
self.view.addSubview(scrollView!)

//遍历图片数组
for var i = 0 ; i < scArray?.count ; i++ {

let str :String = (scArray?.objectAtIndex(i))! as! String
let img = UIImage(named: str)
//初始化imageView
let imgV :UIImageView = UIImageView()
//添加图片
imgV.image = img
imgV.backgroundColor = UIColor.lightGrayColor()
//设置图片位置及大小
imgV.frame = CGRectMake((CGFloat(i) * SCROLL_WIDTH),0, SCROLL_WIDTH, SCROLL_HEIGHT)
scrollView?.addSubview(imgV)

//轻拍手势
let tap = UITapGestureRecognizer.init(target: self, action: "tapImageV:")
imgV.tag = 1000 + i
//打开用户交互
imgV.userInteractionEnabled = true
//给图片添加轻拍手势
imgV.addGestureRecognizer(tap)

}

//设置小点的位置大小
pageC = UIPageControl.init(frame: CGRectMake((SCROLL_WIDTH - 200) / 2, SCROLL_HEIGHT - 50, 200, 50))
//设置小点背景色
pageC?.backgroundColor = UIColor.clearColor()
//设置小点个数
pageC?.numberOfPages = (scArray?.count)! - 2
//设置小点当前页码颜色
pageC?.currentPageIndicatorTintColor = UIColor.whiteColor()
//设置小点未选中页码颜色
pageC?.pageIndicatorTintColor = UIColor.grayColor()
//设置当前选中页
pageC?.currentPage = 0
self.view.addSubview(pageC!)

timer = NSTimer.scheduledTimerWithTimeInterval(3.0, target: self, selector: "change:", userInfo: nil, repeats: true)

}

//循环滚动方法
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
//如果图片在第一张的位置
if scrollView.contentOffset.x == 0 {
//就变到倒数第二张的位置上
scrollView.scrollRectToVisible(CGRectMake(scrollView.contentSize.width - 2 * SCROLL_WIDTH,0,SCROLL_WIDTH,SCROLL_HEIGHT), animated: false)
//如果图片是倒数第一张的位置
} else if scrollView.contentOffset.x == scrollView.contentSize.width - SCROLL_WIDTH {
//就变到第二张的位置
scrollView .scrollRectToVisible(CGRectMake(SCROLL_WIDTH, 0, SCROLL_WIDTH, SCROLL_HEIGHT), animated: false)
}

pageC?.currentPage = Int(scrollView.contentOffset.x / SCROLL_WIDTH) - 1

}

//定时器执行方法
func change(timer :NSTimer) {

if pageC?.currentPage == (pageC?.numberOfPages)! - 1 {
pageC?.currentPage = 0
} else if (pageC?.currentPage)! < (pageC?.numberOfPages)! - 1 {
pageC?.currentPage++
}
scrollView?.setContentOffset(CGPointMake((CGFloat(pageC!.currentPage + 1)) * SCROLL_WIDTH, 0), animated: false)
}

//开启定时器
func addTimer() {
timer = NSTimer.scheduledTimerWithTimeInterval(3.0, target: self, selector: "change:", userInfo: nil, repeats: true)
}

//关闭定时器
func removeTimer() {
timer?.invalidate()
}

//开始拖拽时调用
func scrollViewWillBeginDragging(scrollView: UIScrollView) {
//关闭定时器
removeTimer()
}

//拖拽结束后调用
func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
//开启定时器
addTimer()
}

//轻拍事件
func tapImageV(tap :UITapGestureRecognizer) {

print((tap.view?.tag)! - 1001)

}