swift+UIPageViewController 纯代码实现引导页

使用UIPageViewController

1、介绍：

UIPageViewController是一个类似UINavigationController的Controller容器。它既可以实现UIScrollView的滑动效果，也可以实现UIPageController的翻页效果。其中每个具体的视图由各自的ViewController进行维护管理，UIPageViewController只进行协调与动画布置。
UIPageViewControllerDataSource协议为UIPageViewController提供数据，UIPageViewControllerDelegate对翻页动作、屏幕旋转进行监听。

2、代码：

/// 引导页class YSGuidePageViewController: UIPageViewController,UIPageViewControllerDelegate,UIPageViewControllerDataSource {    /// 页面数量改变时的回调    var pageViewControllerUpdatePageCount:((YSGuidePageViewController,NSInteger)->Void)!    /// 页面改变时的回调    var pageViewControllerUpdatePageIndex:((YSGuidePageViewController,NSInteger)->Void)!    private(set) lazy var allViewControllers:[UIViewController]={        return [YSGuideImgViewController(imgName: "guide_pic_new1",frame: self.view.bounds, showBtn:false),                YSGuideImgViewController(imgName: "guide_pic_new2",frame: self.view.bounds, showBtn:false),                YSGuideImgViewController(imgName: "guide_pic_new3",frame: self.view.bounds,showBtn:true)]    }()    internal init(transitionStyle style: UIPageViewControllerTransitionStyle, navigationOrientation: UIPageViewControllerNavigationOrientation, options: [String : AnyObject]?, pageCount:((YSGuidePageViewController,NSInteger)->Void)!, pageIndex:((YSGuidePageViewController,NSInteger)->Void)!) {        super.init(transitionStyle: style, navigationOrientation: navigationOrientation, options: options)        self.pageViewControllerUpdatePageCount = pageCount        self.pageViewControllerUpdatePageIndex = pageIndex    }    required init?(coder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    override func viewDidLoad() {        super.viewDidLoad()        delegate = self        dataSource = self        //设置首页        if let firstViewController = allViewControllers.first {            setViewControllers([firstViewController], direction: .Forward, animated: true, completion:nil)        }        //页面数量改变时        if self.pageViewControllerUpdatePageCount != nil {            self.pageViewControllerUpdatePageCount(self,allViewControllers.count)        }    }    //mark:获取前一个页面    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {        //guard 条件为false就执行else里的函数块        guard let viewControllerIndex = allViewControllers.indexOf(viewController) else {            return nil        }        let previousIndex = viewControllerIndex - 1        guard previousIndex >= 0 else {            return nil        }        guard allViewControllers.count > previousIndex else {            return nil        }        return allViewControllers[previousIndex]    }    //mark:获取后一个页面    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {        guard let viewControllerIndex = allViewControllers.indexOf(viewController) else {            return nil        }        let nextIndex = viewControllerIndex + 1        let orderedViewControllersCount = allViewControllers.count        guard orderedViewControllersCount != nextIndex else {            return nil        }        guard orderedViewControllersCount>nextIndex else {            return nil        }        return allViewControllers[nextIndex]    }    //mark:页面切换完毕    func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {        if let firstViewController = viewControllers?.first,let index = allViewControllers.indexOf(firstViewController) {            if self.pageViewControllerUpdatePageIndex != nil {                self.pageViewControllerUpdatePageIndex(self,index)            }        }    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}/// 具体承载引导图片的VCclass YSGuideImgViewController: UIViewController {    private(set) lazy var imgview:UIImageView = {        return UIImageView.init(frame:self.view.bounds)    }()    private(set) lazy var beginBtn:UIButton = {        return UIButton(type:.Custom)    }()    /**     重写了初始化方法     - parameter imgName: 使用到的图片名称     - parameter frame:   图片的frame     - parameter showBtn: 是否展示开始体验的按钮     - returns:     */    init(imgName:String, frame:CGRect, showBtn:Bool){        super.init(nibName: nil, bundle: nil)        self.view.frame = frame        self.view.addSubview(self.imgview)        self.imgview.image = UIImage(named: imgName)        self.beginBtn.frame = CGRectMake((self.view.bounds.width-174)/2, self.view.bounds.height-40-42, 174, 42)        self.beginBtn.setImage(UIImage(named:"home_btn_startup"), forState: .Normal)        self.beginBtn.addTarget(self, action:#selector(beginBtnClicked), forControlEvents: .TouchUpInside)        self.view.addSubview(self.beginBtn)        self.beginBtn.hidden = !showBtn    }    /**     按钮点击事件     */    func beginBtnClicked() {        NSNotificationCenter.defaultCenter().postNotificationName("beginExperience", object: nil)    }    required init?(coder aDecoder: NSCoder) {        fatalError("init(coder:) has not been implemented")    }    override func viewDidLoad() {        super.viewDidLoad()    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}/// 加载PageViewController的VCclass YSGuideViewController: YSBaseController {    private(set) lazy var pageControl:UIPageControl = {        return UIPageControl(frame:CGRectMake((self.view.bounds.width-200)/2,self.view.bounds.height-20-10,200,20))    }()    override func viewDidLoad() {        super.viewDidLoad()        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(removeGuidePageView), name: "beginExperience", object: nil)        self.view.backgroundColor = UIColor(patternImage:UIImage(named: "launch_bg")!)        self.view.addSubview(pageControl)        pageControl.backgroundColor = UIColor.clearColor()        pageControl.pageIndicatorTintColor = UIColor.whiteColor()        pageControl.currentPageIndicatorTintColor = UIColor.redColor()        loadGuidePageView()    }    func loadGuidePageView() {        let guideview = YSGuidePageViewController.init(transitionStyle: .PageCurl, navigationOrientation: .Horizontal, options: nil, pageCount: { (guide:YSGuidePageViewController, count:NSInteger) in            self.pageControl.numberOfPages = count            },pageIndex: {(guide:YSGuidePageViewController, index:NSInteger) in                self.pageControl.currentPage = index        })//Scroll        guideview.view.frame = self.view.bounds        self.view.addSubview(guideview.view)        self.addChildViewController(guideview)        self.view.bringSubviewToFront(pageControl)    }    /**     移除引导页,同时记录引导页已经显示完成     */    func removeGuidePageView() {        self.view.removeFromSuperview()        self.removeFromParentViewController()        //Todo:存储第一次已经显示引导页    }    deinit {        NSNotificationCenter.defaultCenter().removeObserver(self)    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

3、实现提醒：

1、首先使用的过程中出现的一个最大最无语的问题就是UIPageViewController的代理不执行，而且只有一个引导页。
出现这个问题的原因是在YSGuideViewController中使用的时候忘记写 self.addChildViewController(guideview) ,所以这个狠重要。