title: Incorrect Assets image loads in iPad
body: <p>I have added an image of three dimensions to Assets.xcassets</p>
  
  <pre><code>back.png with size 18 x 14 pixels
  back@2x.png with size 36 x 28 pixels
  back@3x.png with size 54 x 42 pixels
  </code></pre>
  
  <p>I have set the image property of UIButton as "back" in Attributes Inspector. On running the application on iPad Pro(12.9-inch 3rd generation), Xcode should automatically populate back@3x.png as image on that UIButton. But, its loading lowest resolution image i.e. back.png, on the UIButton.</p>
  
  <p>Please assist as I need to load higher pixels image for iPad's.</p>