title: Swift: How to extract image filename from an array of UIImage
body: <p>If I have an array of UIImage like so:</p>
  
  <pre><code>newImageArray = [UIImage(named:"Red.png")!,
          UIImage(named:"Green.png")!,
          UIImage(named:"Blue.png")!, UIImage(named:"Yellow.png")!]
  </code></pre>
  
  <p>How can I extract or determine the filename of an image of a certain index later on? For example:</p>
  
  <pre><code>println("The first image is \(newImageArray[0])")
  </code></pre>
  
  <p>Instead of returning a readable filename, it returns:</p>
  
  <pre><code>The first image is &lt;UIImage: 0x7fe211d2b1a0&gt;
  </code></pre>
  
  <p>Can I convert this output into readable text, or is there a different method of extracting filenames from UIImage arrays?</p>