Swift UIScrollView滚动视图/无限循环滚动/自动滚动_swift scrollview无限滚动

之前用OC写了UIScrollView,这次用Swift写的,写的不好多担待,O(∩_∩)O~

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