swift中UIScrollView的使用（结合pageControl，timer计时的使用）

github学习地址：https://github.com/potato512/SYSwiftLearning

效果图

关键源码

func setUI(){        self.setScrollViewUI()        self.setPageControlUI()}

func setScrollViewUI(){        self.mainScrollView = UIScrollView(frame: CGRectMake(0.0, 0.0, CGRectGetWidth(self.view.bounds), 200.0))                // 添加到父视图        self.view.addSubview(self.mainScrollView)                // 添加子视图label        var originX:CGFloat = 0.0        for number in 1...10        {            let label = UILabel(frame: CGRectMake(originX, 0.0, CGRectGetWidth(self.mainScrollView.bounds), CGRectGetHeight(self.mainScrollView.bounds)))            self.mainScrollView.addSubview(label)            label.backgroundColor = UIColor(red: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), green: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), alpha: 1.0)            label.textAlignment = .Center            label.text = String(format: "scrollView add 第 %ld 个 label", arguments: [number]);                        originX = (CGRectGetMinX(label.frame) + CGRectGetWidth(label.frame))        }                // 背景颜色        self.mainScrollView.backgroundColor = UIColor(red: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), green: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(random()) / CGFloat(RAND_MAX)), alpha: 1.0)        // 自适应父视图        // self.mainScrollView.autoresizingMask = UIViewAutoresizing.FlexibleHeight        // 其他属性        self.mainScrollView.scrollEnabled = true // 可以上下滚动        self.mainScrollView.scrollsToTop = true // 点击状态栏时，可以滚动回顶端        self.mainScrollView.bounces = true // 在最顶端或最底端时，仍然可以滚动，且释放后有动画返回效果        mainScrollView.pagingEnabled = true // 分页显示效果        mainScrollView.showsHorizontalScrollIndicator = true // 显示水平滚动条        mainScrollView.showsVerticalScrollIndicator = true // 显示垂直滚动条        mainScrollView.indicatorStyle = UIScrollViewIndicatorStyle.White // 滑动条的样式        // 设置内容大小        self.mainScrollView.contentSize = CGSizeMake(originX, 200.0)                // 代理        self.mainScrollView.delegate = self}

func setPageControlUI(){        self.mainPageControl = UIPageControl(frame: CGRectMake((CGRectGetWidth(self.view.bounds) - 200.0) / 2, (CGRectGetHeight(self.mainScrollView.bounds) - 20.0 - 10.0), 200.0, 20.0))        // 添加到父视图        self.view.addSubview(self.mainPageControl)        // 背景颜色        self.mainPageControl.backgroundColor = UIColor.lightGrayColor()                // 其他属性设置        self.mainPageControl.numberOfPages = 10 // 总页数        self.mainPageControl.currentPage = 0 // 当前页数，默认为0，即第一个，实际数量是0~n-1        self.mainPageControl.pageIndicatorTintColor = UIColor.yellowColor() // 非当前页颜色        self.mainPageControl.currentPageIndicatorTintColor = UIColor.redColor() // 当前页颜色}

// MARK: - UIScrollViewDelegate    func scrollViewWillBeginDragging(scrollView: UIScrollView){        print("1 scrollViewWillBeginDragging")}    func scrollViewDidScroll(scrollView: UIScrollView){        print("2 scrollViewDidScroll")}func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>){        print("3 scrollViewWillEndDragging")}    func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool){        print("4 scrollViewDidEndDragging")}    func scrollViewWillBeginDecelerating(scrollView: UIScrollView){        print("5 scrollViewWillBeginDecelerating")}func scrollViewDidEndDecelerating(scrollView: UIScrollView){        print("6 scrollViewDidEndDecelerating")                let width = CGRectGetWidth(scrollView.frame)        let offsetX = scrollView.contentOffset.x        let index = offsetX / width        print("当前页是：\(index)")                self.mainPageControl.currentPage = Int(index)}

// MARK: - timer周期    override func viewWillAppear(animated: Bool) {        super.viewWillAppear(animated)                self.addTimer()}    override func viewWillDisappear(animated: Bool) {        super.viewWillDisappear(animated)        self.removerTimer()}

// MARK: - timer    func addTimer(){        self.mainTimer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("autoShow"), userInfo: nil, repeats: true)    }        func removerTimer()    {        if self.mainTimer != nil        {            self.mainTimer.invalidate()            self.mainTimer = nil        }}    func autoShow(){        var page = self.mainPageControl.currentPage        if 9 == page        {            page = 0        }        else        {            page++        }                // 设置偏移量        let offsetX = CGFloat(page) * CGRectGetWidth(self.mainScrollView.frame)        self.mainScrollView.setContentOffset(CGPointMake(offsetX, 0.0), animated: true)        self.mainPageControl.currentPage = page}