Spacing between Images

Hi

I am displaying Images in collecction View horizontally I want to give white spacing between images.

cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell2", for: indexPath) as UICollectionViewCell
            let dict = arrImages2.object(at: indexPath.row) as? NSDictionary
            var imageView : UIImageView
            imageView  = UIImageView(frame:CGRect(x: 0, y: 0, width: cell.frame.size.width , height: cell.frame.size.height))
            let url = URL(string: dict?.value(forKey: "aimg") as! String)
            imageView.kf.setImage(with: url)
            imageView.contentMode = UIViewContentMode.scaleAspectFill

Thanks