To add inspectable properties to control the border of a view

UIView+Border.swift

//
//  UIView+Border.swift
//
//  Created by Rigoberto Sáenz Imbacuán (https://www.linkedin.com/in/rsaenzi/)
//  Copyright © 2017. All rights reserved.
//

import UIKit

@IBDesignable
extension UIView {
    
    @IBInspectable
    var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
            layer.masksToBounds = newValue > 0
            clipsToBounds = newValue > 0
        }
    }
    
    @IBInspectable
    var borderWidth: CGFloat {
        set {
            layer.borderWidth = newValue
        }
        get {
            return layer.borderWidth
        }
    }
    
    @IBInspectable
    var borderColor: UIColor? {
        set {
            layer.borderColor = newValue?.cgColor
        }
        get {
            if let color = layer.borderColor {
                return UIColor(cgColor: color)
            } else {
                return nil
            }
        }
    }
}