UIButton bottom shadow

Question

I have a UIButton which is very similar to the standard iOS keyboard alphabet button.

I am not sure how to create a shadow only for the bottom layer li

Answer 1

View bottom shadow swift 4.2

viewTop.layer.shadowOffset = CGSize(width: 0, height: 1)
viewTop.layer.shadowColor = UIColor.lightGray.cgColor
viewTop.layer.shadowOpacity = 1
viewTop.layer.shadowRadius = 5
viewTop.layer.masksToBounds = false