     */
     func numberOfVisiblePagesInUnlimitedScrollView(unlimitedScrollView: UnlimitedScrollView) -> Int
     /**
-    Called when need to create page
+    Called when need to create page.
 
     - parameter unlimitedScrollView: unlimitedScrollView view object
     - parameter index:               page index

    */
    func numberOfPagesInUnlimitedScrollView(unlimitedScrollView: UnlimitedScrollView) -> Int
    /**
    Return number of visible pages

    - parameter unlimitedScrollView: unlimitedScrollView view object


    }

    /**
    Reload all pages data source.
    */
    public func reloadData() {
        assert(self.firstVisiblePageIndex < self.numberOfPages, "firstVisiblePageIndex is less than numberOfPages")
        assert(self.numberOfVisiblePages % 2 == 1, "numberOfVisiblePages only accepts odd.")
        self.updateData()
        self.emitArrivePageEvent()
    }
