 
 public class LoopPage: UIView {
 
-    public var defaultImage : UIImage!  // default is nil (UIView && backgroundColor = whiteColor)
     public var timeInterval : NSTimeInterval!  //   default is 0 -> 不自动轮播
     
     private var collectionView : UICollectionView?

    //KARK: - Lazy
    private lazy var pageCtl : UIPageControl = {
        let pageCtl = UIPageControl()
        pageCtl.backgroundColor = UIColor.redColor()
        return pageCtl
    }()
}

    
    public func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let page = collectionView.dequeueReusableCellWithReuseIdentifier("loopCell", forIndexPath: indexPath)
        let realIndex = indexPath.item % pageCount
        let currentView = pageCurrentClosure!(pageIndex: realIndex)
        currentView.frame = page.bounds
