title: Custom change color of cell bottom border
body: <p>I need to change color of bottom cell in UICollectionView, in this <a href="https://stackoverflow.com/questions/30531111/how-do-i-customize-a-uitableview-right-top-and-bottom-border">question</a> just I do <a href="https://ibb.co/c186MV2" rel="nofollow noreferrer">this</a></p>
  
  <p>I need set color to bottom cell like <a href="https://ibb.co/TYjLD3L" rel="nofollow noreferrer">this</a></p>
  
  <pre><code>let border = CALayer()
  let width = CGFloat(2.0)
  border.borderColor = UIColor(red: 184/255, green: 215/255, blue: 215/255, alpha: 1).cgColor
  border.frame = CGRect(x: 0, y: cell.frame.size.height - width, width: cell.frame.size.width, height: cell.frame.size.height)
  border.borderWidth = width
  cell.layer.addSublayer(border)
  cell.layer.masksToBounds = true
  </code></pre>