重新加载后UICollectionView单元格不会更新

Question

 self.filterCollectionView.reloadData()       

调用重载数据后，调用可见单元格的cellforItem，但在我来回滚动之前，我的单元格值不会更新

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
       let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath)
        cell.backgroundColor = UIColor.clearColor()
        cell.selected = false
        cell.alpha = 1.0
        for each in cell.contentView.subviews{
            each.removeFromSuperview()
        }

        let title = UILabel(frame: CGRectMake(0, 0, cell.bounds.size.width, 40))
        title.text = filterArray[indexPath.row]
        title.textColor = UIColor.blueColor()
        title.textAlignment = .Center
        cell.layer.cornerRadius = 4.0

        cell.contentView.addSubview(title)
        return cell

    }