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

in swift 2.0 add shadow uiview (uibutton) with code before class declaration or in swift file functions:

extension UIView {

    func addShadowView(width:CGFloat=0.2, height:CGFloat=0.2, Opacidade:Float=0.7, maskToBounds:Bool=false, radius:CGFloat=0.5){
         self.layer.shadowColor = UIColor.blackColor().CGColor
         self.layer.shadowOffset = CGSize(width: width, height: height)
         self.layer.shadowRadius = radius
         self.layer.shadowOpacity = Opacidade
         self.layer.masksToBounds = maskToBounds
    }

}

in viewdidload add this code

button.addShadowView()