1，下面演示如何使用自定义的下拉刷新界面，效果图如下：
（1）随着下拉，界面透明度从0开始慢慢显示出来

开始刷新时，文字会有跑马灯效果（字体逐个变大，同时会变色）

2，首先使用xib创建一个界面（RefreshView.xib） （1）其属性做如下设置

（2）在里面添加6个Label，用来显示描述文字（由于文字要单独播放动画，所以要分开）

（3）分别给各个Label添加约束 我习惯先给中间一个定好位，其它的文本标签根据中间的来排。由于是6个Label，那就先设置第3个Label（“刷”）的约束，宽高固定，垂直居中，水平-19居中。

设置第2个Label（“拉”）约束，宽高固定，水平距右10，垂直居中

3，主页代码 （1）为更好的看到效果，模拟网络请求，这里使用NSTimer延时3秒生成数据 （2）一定要把 UIRefreshControl 的 backgroundColor 和 tintColor 设置成 UIColor.clearColor()。否则自定义的刷新界面高度不会自动拉伸，会变成固定高度的。

import UIKit
 
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
     
    //新闻列表
    @IBOutlet weak var newsTableView: UITableView!
     
    //新闻数组集合
    var dataArray:[HanggeArticle] = [HanggeArticle]()
     
    //拉刷新控制器
    var refreshControl = UIRefreshControl()
     
    var customView: UIView!
     
    var labelsArray: Array<UILabel> = []
     
    var currentColorIndex = 0
     
    var currentLabelIndex = 0
     
    var timer: NSTimer!
     
    override func viewDidLoad() {
        super.viewDidLoad()
         
        //添加刷新
        refreshControl.addTarget(self, action: "refreshData",
            forControlEvents: UIControlEvents.ValueChanged)
         
        //背景色和tint颜色都要清除,保证自定义下拉视图高度自适应
        refreshControl.backgroundColor = UIColor.clearColor()
        refreshControl.tintColor = UIColor.clearColor()
         
        newsTableView.addSubview(refreshControl)
        loadData()
         
        //加载自定义刷新界面
        loadCustomRefreshView()
    }
     
     
    //自定义刷新界面
    func loadCustomRefreshView() {
        let refreshContents = NSBundle.mainBundle().loadNibNamed("RefreshView",
            owner: self, options: nil)
         
        customView = refreshContents[0] as! UIView
        customView.frame = refreshControl.bounds
         
        customView.alpha = 0.0
         
        for var i=0; i<customView.subviews.count; ++i {
            labelsArray.append(customView.viewWithTag(i + 1) as! UILabel)
        }
         
        refreshControl.addSubview(customView)
    }
     
    //滚动视图开始拖动
    func scrollViewWillBeginDragging(scrollView: UIScrollView) {
        if !refreshControl.refreshing {
            self.labelsArray[0].text = "下"
            self.labelsArray[1].text = "拉"
            self.labelsArray[2].text = "刷"
            self.labelsArray[3].text = "新"
            self.labelsArray[4].text = "数"
            self.labelsArray[5].text = "据"
        }
    }
     
    //视图拖动
    func scrollViewDidScroll(scrollView: UIScrollView) {
        //加载界面透明度改变
        let sg = ( scrollView.contentOffset.y * -1 ) / 60.0
        customView.alpha = sg
    }
     
    // 刷新数据
    func refreshData() {
        self.labelsArray[0].text = "数"
        self.labelsArray[1].text = "据"
        self.labelsArray[2].text = "加"
        self.labelsArray[3].text = "载"
        self.labelsArray[4].text = "中"
        self.labelsArray[5].text = "..."
         
        //播放动画
        playAnimateRefresh()
         
        //模拟加载数据
        timer = NSTimer.scheduledTimerWithTimeInterval(3.0, target: self,
            selector: "loadData", userInfo: nil, repeats: true)
    }
     
    //播放文字动画
    func playAnimateRefresh() {
        //文字放大，变色动画
        UIView.animateWithDuration(0.15, delay: 0.0,
            options: .CurveLinear, animations: { () -> Void in
                 
            self.labelsArray[self.currentLabelIndex].transform =
                CGAffineTransformMakeScale(1.5, 1.5)
            self.labelsArray[self.currentLabelIndex].textColor =
                self.getNextColor()
             
            }, completion: { (finished) -> Void in
                 
                //文字样式还原动画
                UIView.animateWithDuration(0.1, delay: 0.0,
                    options: .CurveLinear, animations: { () -> Void in
                         
                    self.labelsArray[self.currentLabelIndex].transform =
                        CGAffineTransformIdentity
                    self.labelsArray[self.currentLabelIndex].textColor =
                        UIColor.blackColor()
                     
                    }, completion: { (finished) -> Void in
                        ++self.currentLabelIndex
                         
                        if self.currentLabelIndex == self.labelsArray.count - 1 {
                            self.currentLabelIndex = 0
                        }
                         
                        //没加载完则继续播放动画
                        if self.refreshControl.refreshing {
                            self.playAnimateRefresh()
                        }else{
                            self.currentLabelIndex = 0
                        }
                })
        })
    }
     
    //计时器时间到,加载数据
    func loadData() {
        //移除老数据
        self.dataArray.removeAll()
        //随机添加5条新数据（时间是当前时间）
        for _ in 0..<5 {
            let atricle = HanggeArticle(title: "新闻标题(Int(arc4random()%1000))",
                createDate: NSDate())
            self.dataArray.append(atricle)
        }
        self.newsTableView.reloadData()
        self.refreshControl.endRefreshing()
         
        timer?.invalidate()
        timer = nil
    }
     
    // 返回记录数
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataArray.count;
    }
     
    // 返回单元格内容
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
        -> UITableViewCell {
            let cell = UITableViewCell(style: UITableViewCellStyle.Subtitle,
                reuseIdentifier: "myCell")
             
            //设置单元格标题
            let atricle: HanggeArticle = dataArray[indexPath.row] as HanggeArticle
            cell.textLabel?.text = atricle.title
             
            //设置单元格副标题
            let dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
            let str = dateFormatter.stringFromDate(atricle.createDate)
            cell.detailTextLabel?.text = str
             
            return cell;
    }
     
    //获取下一个颜色
    func getNextColor() -> UIColor {
        var colorsArray: Array<UIColor> = [UIColor.magentaColor(),
            UIColor.brownColor(), UIColor.yellowColor(), UIColor.redColor(),
            UIColor.greenColor(), UIColor.blueColor(), UIColor.orangeColor()]
         
        if currentColorIndex == colorsArray.count {
            currentColorIndex = 0
        }
         
        let returnColor = colorsArray[currentColorIndex]
        ++currentColorIndex
         
        return returnColor
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}
 
//新闻结构体
struct HanggeArticle {
    var title:String
    var createDate:NSDate
}

源码：2015110819264770274

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