override func viewDidLoad() {        super.viewDidLoad()        self.view.backgroundColor = UIColor.cyan        self.navigationItem.title = "滚动视图"        self.view.addSubview(self.scrollView)    }      fileprivate  lazy var scrollView:UIScrollView = {                let Scroll:UIScrollView = UIScrollView.init(frame: UIScreen.main.bounds)        Scroll.contentSize = CGSize.init(width:kScreenW*3,height:kScreenH)        Scroll.contentOffset = CGPoint.init(x: 0 , y: 0)        self.automaticallyAdjustsScrollViewInsets = false        Scroll.showsHorizontalScrollIndicator = false        Scroll.showsVerticalScrollIndicator = false        Scroll.isPagingEnabled = true        Scroll.isScrollEnabled = true        Scroll.bounces = false        Scroll.delegate = self            return Scroll    }()