title: NSImage to NSData as PNG Swift
body: <p>I am writing a Mac app based on an iOS app. The code below converts a UIImage to NSData to upload to Parse.com.</p>
  
  <p>I would like to do the same for Mac but I do not seem to be able to convert it to NSData. What should I be doing?</p>
  
  <p>Thanks</p>
  
  <pre><code>var image = UIImage(named: "SmudgeInc")
  
  let imageData = UIImagePNGRepresentation(image)
  
  let imageFile = PFFile(name:"image.png", data:imageData)
  </code></pre>