Border and corner extension for UIView - Swift 3

UIViewExtension.swift

//
//  Credits to:
//    https://gist.github.com/feighter09/c502d7550e4cdb82d526157f5cf8bef1
//    http://nshipster.com/ibinspectable-ibdesignable/
//
//  Created by José Tomás González on 23-04-17.
//  Copyright © 2017 Swipe. All rights reserved.
//

import Foundation
import UIKit

extension UIView {
    @IBInspectable var borderColor: UIColor? {
        get {
            return layer.borderColor.map(UIColor.init)
        }
        set {
            layer.borderColor = newValue?.cgColor
        }
    }
    @IBInspectable var borderWidth: CGFloat {
        get {
            return layer.borderWidth
        }
        set {
            layer.borderWidth = newValue
        }
    }
    
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
        }
    }
}

README

This code adds the possibility of modifying an interface border color, width and corner radius through the Interface Builder’s inspector panel of any element that inherits from UIView.

Credits to NSHipster