title: Image sizes with Asset Catalog and Sizing Classes for a iOS 8 Universal app?
body: <p>My app is currently just for iPad, I think I might be able to just make a smaller version of iPhone, with the 'any' sizing class.</p>
  
  <p>EDIT: I just want to use a universal storyboard if possible.</p>
  
  <p>I think I will just need to select iPad and iPhone in my asset catalog image sets.</p>
  
  <p>I'm hoping I can make proportional constraints, however I'm not sure how to do with without providing constant widths / heights for images.</p>
  
  <p>How do I then work out what images I will need to provide, also whats the best way to provide images?</p>
  
  <p>I've seen you can provide vector images, I believe the documentation said that Xcode would produce the sizes required from them?</p>