layer.cornerRadius Number 10
layer.masksToBounds Boolean true

let circle = UIImage(named: "circle")
button.setBackgroundImage(circle, for: UIControlState.normal)

@IBInspectable var cornerRadius: CGFloat = 0{
    didSet{
    self.layer.cornerRadius = cornerRadius
    }
}

@IBInspectable var borderWidth: CGFloat = 0{
    didSet{
        self.layer.borderWidth = borderWidth
    }
}

@IBInspectable var borderColor: UIColor = UIColor.clear{
    didSet{
        self.layer.borderColor = borderColor.cgColor
    }
}