title: iOS: Preparing background images for applications
body: <p>Mostly every iOS application has a view with an image as background. Is there any image sizing guide out there? For example here is an iOS screen designed in Sketch:</p>
  
  <p><a href="https://i.stack.imgur.com/tBVtf.jpg"><img src="https://i.stack.imgur.com/tBVtf.jpg" alt="enter image description here"></a></p>
  
  <p>As you can see there is a background image. Now there are lots of Apple devices every application should support. The new iOS 10 supports all devices from iPhone 5 to iPhone 6s Plus. They have different screen sizes and resolutions. When creating Xcode assets, I am giving 3 background images with different sizes - <code>@1x, @2x, @3x</code>. What sizes should they be?</p>