UIView Extension in Swift 3, unabling Border Color, Width, Radius & Shadow parameters in Storyboard views

UIView Extension - Swift 3

import UIKit

@IBDesignable extension UIView {
    
    /* BORDER */
    @IBInspectable var borderColor:UIColor? {
        set {
            layer.borderColor = newValue!.cgColor
        }
        get {
            if let color = layer.borderColor {
                return UIColor(cgColor: color)
            }
            else {
                return nil
            }
        }
    }
    @IBInspectable var borderWidth:CGFloat {
        set {
            layer.borderWidth = newValue
        }
        get {
            return layer.borderWidth
        }
    }
    
    /* BORDER RADIUS */
    @IBInspectable var cornerRadius:CGFloat {
        set {
            layer.cornerRadius = newValue
            clipsToBounds = newValue > 0
        }
        get {
            return layer.cornerRadius
        }
    }
    
    
    /* SHADOW */
    @IBInspectable var shadowColor:UIColor? {
        set {
            layer.shadowColor = newValue!.cgColor
        }
        get {
            if let color = layer.shadowColor {
                return UIColor(cgColor: color)
            }
            else {
                return nil
            }
        }
    }
    @IBInspectable var shadowOpacity:Float {
        set {
            layer.shadowOpacity = newValue
        }
        get {
            return layer.shadowOpacity
        }
    }
    @IBInspectable var shadowOffset:CGSize {
        set {
            layer.shadowOffset = newValue
        }
        get {
            return layer.shadowOffset
        }
    }
    @IBInspectable var shadowRadius:CGFloat {
        set {
            layer.shadowRadius = newValue
        }
        get {
            return layer.shadowRadius
        }
    }

    
}