title: Accessing content scaleFactor / multiplier?
body: <p>I am working on an iPhone 6 Plus, and getting the bounds of my UIView using:</p>
  
  <pre><code>let viewBounds = view.bounds // GIVES 736 x 414 (Points), WHICH IS RIGHT
  </code></pre>
  
  <p>Is there any way that I can get the multiplier (i.e. the @3x) that is used to convert the points into pixels. I was hoping that I could use:</p>
  
  <pre><code>let scaleFactor = view.contentScaleFactor // GIVES 1
  </code></pre>
  
  <p>But as you can see it always seems to return 1. I know that I can grab the screen size directly using <code>preferredMode.size</code> or <code>nativeBounds</code> but I am sure there was a way before to access the multiplier too?</p>
  
  <pre><code>// WHERE SCALE FACTOR WOULD BE 3
  let yRes = viewBounds.height * scaleFactor // 736 x 3 = 2208
  let xRes = viewBounds.width * scaleFactor //  414 x 3 = 1242
  </code></pre>