         let views:[String:UIView] = [
             "collectionView":collectionView]
         
-        let metrics:[String:CGFloat] = [
-            "barHeight":barHeight]
+        let metrics:[String:CGFloat] = [:]
         
         addConstraints(NSLayoutConstraint.constraints(
             withVisualFormat:"H:|-0-[collectionView]-0-|",

        let item:MLoginItem = modelAtIndex(index:indexPath)
        let width:CGFloat = collectionView.bounds.maxX
        let size:CGSize = CGSize(width:width, height:item.cellHeight)
        
        return size
    }

            metrics:metrics,
            views:views))
        addConstraints(NSLayoutConstraint.constraints(
            withVisualFormat:"V:|-0-[collectionView]-0-|",
            options:[],
            metrics:metrics,
            views:views))
