UIImage Extension that creates an image with text

UIImageExtension.swift

//
//  UIImageExtension.swift
//
//  Created by Mathieu White on 2016-02-05.
//  Copyright © 2016 Mathieu White. All rights reserved.
//

import UIKit

extension UIImage
{
    /**
     This method creates a UIView the with the text, color and size passed in, 
     and returns it as a UIImage.
     
     - parameter text:              the text to display in the center of the image
     - parameter color:             the text color of the image
     - parameter backgroundColor:   the background color of the image
     - parameter size:              the size of the image
     
     - returns: a UIImage with the parameters specified
     */
    class func imageWithText(text: String, color: UIColor, backgroundColor: UIColor, size: CGSize) -> UIImage?
    {
        // Begin the image context
        UIGraphicsBeginImageContextWithOptions(size, false, UIScreen.mainScreen().scale)
        
        // Get the context, and generate the image
        if let context = UIGraphicsGetCurrentContext()
        {
            // Initialize the image view
            let imageView: UIView = UIView(frame: CGRect(origin: CGPointZero, size: size))
            imageView.backgroundColor = backgroundColor
            
            // Initialize the label
            let textLabel: UILabel = UILabel(frame: imageView.frame)
            textLabel.text = text
            textLabel.textColor = color
            textLabel.textAlignment = NSTextAlignment.Center
            textLabel.font = UIFont.fontOfSize((size.height < size.width) ? size.height * 0.36 : size.width * 0.36,
                weight: UIFont.FontWeight.Light)
            textLabel.adjustsFontSizeToFitWidth = true
            textLabel.center = imageView.center
            
            // Add the label to the imageView
            imageView.addSubview(textLabel)
            
            // Render the image view
            imageView.layer.renderInContext(context)
            
            // Get the image
            let image = UIGraphicsGetImageFromCurrentImageContext()
            
            // End the image context
            UIGraphicsEndImageContext()
            
            // Return the image
            return image
        }
        
        // End the image context
        UIGraphicsEndImageContext()
        
        // Something went wrong
        return nil
    }
}