UIButton custom class

I have the following custom class of a UIButton , but when I add it to a button in Xcode I can not make the changes be reflected. Does anyone know what the problem is?

import UIKit
class BotonBordesRedondeados: UIButton {

    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    /*override func draw(_ rect: CGRect) {
        // Drawing code
        setup()
    }*/


    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }


    func setup () {

        self.layer.backgroundColor = ColorUtils.hexStringToUIColor(hex: "#6B00FF") as! CGColor

        self.backgroundColor = ColorUtils.hexStringToUIColor(hex: "#6B00FF")

        layer.borderColor = ColorUtils.hexStringToUIColor(hex: "#6B00FF").cgColor
        layer.cornerRadius = 20
        layer.borderWidth = 2.0

    }

}