Swift可向上滑移出界面的欢迎页简单封装

使用:
-(WelcomView*)welcomeView{
    if (!_welcomeView) {
        _welcomeView = [[NSBundle mainBundle] loadNibNamed:@"WelcomView" owner:nil options:nil].firstObject;
        _welcomeView.frame = self.window.frame;
    }
    return _welcomeView;
}

............
         ImgModel *im = [[ImgModel alloc]init];
          [im setValuesForKeysWithDictionary:obj];
          self.welcomeView.imgArray = @[im];

//MARK:- Timer
extension Timer{
    /**
     *计时器暂停
     */
    func timer_pause(){
        self.fireDate = Date.distantFuture
    }

    /**
     *计时器继续
     */
    func timer_continue(){
        self.fireDate = Date.distantPast
    }
}

import UIKit
//图片信息模型,根据需求修改
class ImgModel: NSObject {
    var PicPath = ""
    var PicDescription = ""
    var AppSubjectPictureID = ""
    var InfoLinkUrl = ""
    var ShowSeconds = ""

    override func setValue(_ value: Any?, forUndefinedKey key: String) {
        #if DEBUG
            print("ImgModel出现了未定义的字段:\(key)-->\(String(describing: value))")
        #endif
    }
}

class WelcomView: UIView ,UIScrollViewDelegate{
    //空间关联
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var pageController: UIPageControl!
    @IBOutlet weak var titleLB: UILabel!
    @IBOutlet weak var btnBgview: UIView!
    @IBOutlet weak var timeLB: UILabel!
    @IBOutlet weak var intoMainBtn: UIButton!

    var stopIndex = 0 //滚动视图停止时候停在的位置
    var beginPoint = CGPoint()
    var beginPoint1 = CGPoint()
    var second = 0
    var beginSecond = 0
    var timer:Timer?
    //图片资源数组
    var imgArray = [ImgModel]() {
        didSet{
            scrollView.tag = 1000
            scrollView.contentSize = CGSize(width: CGFloat(imgArray.count)*self.frame.width, height: self.frame.height)
            pageController.numberOfPages = imgArray.count
            scrollView.isPagingEnabled = true
            scrollView.bounces = true
            scrollView.showsVerticalScrollIndicator = false
            scrollView.showsHorizontalScrollIndicator = false
            scrollView.delegate = self
            for (index,ele) in imgArray.enumerated() {
                let sv = UIScrollView(frame: CGRect(x: CGFloat(index)*self.frame.width, y: 0, width: self.frame.width, height: self.frame.height))
                sv.tag = 1000 + (index + 1)
                sv.delegate = self
                sv.bounces = false
                sv.showsVerticalScrollIndicator = false
                sv.showsHorizontalScrollIndicator = false
                sv.decelerationRate = 0.5
                sv.contentSize = CGSize(width: self.frame.width, height: self.frame.height*2)
                let imgView = UIImageView(frame: CGRect(x: 0, y: 0, width: self.frame.width, height: self.frame.height))
                sv.addSubview(imgView)
                scrollView.addSubview(sv)
                imgView.isUserInteractionEnabled = true
                let tap = UITapGestureRecognizer(target: self, action:#selector(tapAction))
                imgView.addGestureRecognizer(tap)
                second = Int(ele.ShowSeconds)!
                beginSecond = second
                DispatchQueue.main.async {
                    imgView.sd_setImage(with: URL(string:ele.PicPath), placeholderImage: UIImage(named: "正在加载"), options: .lowPriority, completed: { (img:UIImage?, erro:Error?, type:SDImageCacheType, imgUrl:URL?) in
                        if erro != nil{
                            self.removeFromSuperview()
                            self.showHint((erro?.localizedDescription)!)
                        }else{
                            appDelegate.window.addSubview(self)
                        }
                    })
                }
            }
            timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(timerNumChange(t:)), userInfo: nil, repeats: true)
            //self.perform(#selector(removeSelf), with: nil, afterDelay: TimeInterval(second))
            self.bringSubview(toFront: self.btnBgview)
        }
    }

    func timerNumChange(t:Timer){
        second -= 1
        if second >= 0 {
            timeLB.text = "\(second)s"
        }else{
            self.removeSelf()
            timer?.invalidate()
        }
    }

    @IBAction func btnAction(_ sender: UIButton) {
        self.removeFromSuperview()
    }

    //将自己移出界面
    func removeSelf(){
        UIView.animate(withDuration: 0.5, animations: {
            self.center.y = -sheight/2
        }) { (done:Bool) in
            if done {
                self.removeFromSuperview()
            }
        }
    }

    override func draw(_ rect: CGRect) {
        // Drawing code
        super.draw(rect)
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        btnBgview.layer.cornerRadius = 25/2
        btnBgview.layer.masksToBounds = true
    }

    //图片点击事件
    func tapAction(){
        print("点击了第\(stopIndex)张")
    }

    //MARK:ScrollView delegate
    func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
        if scrollView.tag > 1000 {
            beginPoint = self.center
            beginPoint1 = scrollView.contentOffset
            timer?.timer_pause()
            //NSObject.cancelPreviousPerformRequests(withTarget: self, selector: #selector(removeSelf), object: nil)
        }
    }

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if scrollView.tag > 1000 {
            self.center.y = beginPoint.y - scrollView.contentOffset.y - beginPoint1.y
            for imgView in scrollView.subviews {
                if imgView.isKind(of: UIImageView.self) {
                    imgView.center = CGPoint(x: appDelegate.window.center.x, y: scrollView.center.y + scrollView.contentOffset.y - beginPoint1.y)
                    break
                }
            }
        }
    }

    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        if scrollView.tag == 1000 {
            let offset = scrollView.contentOffset.x
            let swidth = UIScreen.main.bounds.size.width
            stopIndex = Int(offset / swidth)
            pageController.currentPage = stopIndex

        }else{
            scrollView.isScrollEnabled = true
            scrollViewDidEndAction(scrollView)
        }
    }

    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        if decelerate{
            if scrollView.tag > 1000 {
                scrollView.isScrollEnabled = false
            }
        }else{
            if scrollView.tag > 1000 {
                scrollViewDidEndAction(scrollView)
            }
        }
    }

    //MARK:滚动结束(界面速度为0)
    func scrollViewDidEndAction(_ scrollView: UIScrollView){

        if self.center.y < 0 {
            UIView.animate(withDuration: 0.5, animations: {
                self.center = CGPoint(x: self.center.x, y: appDelegate.window.center.y * -2)
            }) { (done:Bool) in
                if done {
                    self.removeFromSuperview()
                }
            }
        }else{
            UIView.animate(withDuration: 0.3, delay: 0.1, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.1, options: .curveLinear, animations: {
                self.center = appDelegate.window.center
            }) { (done:Bool) in
                if done {
                    scrollView.contentOffset = self.beginPoint1
                    for imgView in scrollView.subviews {
                        if imgView.isKind(of: UIImageView.self) {
                            imgView.center = CGPoint(x: appDelegate.window.center.x, y: scrollView.center.y)
                            break
                        }
                    }
                    self.second = self.beginSecond + 1
                    self.timer?.timer_continue()
                }
            }
        }
    }
}

XIB效果图