         return UICollectionReusableView()
     }
     
-    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
-        let cell = collectionView.cellForItemAtIndexPath(indexPath) as! BillCellView
+    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets
+    {
+        return UIEdgeInsetsMake(10, 5, 10, 5); //top,left,bottom,right
     }
     
     //MARK: - LoadData

        //cell.backgroundColor = UIColor.clearColor()

        cell.picture.image = UIImage(data: bill.picture)
        return cell
    }
    
    

        let rect = UIScreen.mainScreen().bounds
        let screenWidth = rect.size.width - 40
        return CGSizeMake(screenWidth/3, 160);
    }
    
    func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView {
