title: How to create percentage of total width using autolayout?
body: <p>I need to create three dynamic columns, each with a fixed percentage of the total width.  Not thirds, but different values.  For example, the following illustration shows three columns: the first being 42% wide, the second being 25% wide, and the third being 33% wide.</p>
  
  <p>For a 600 pixel across viewcontroller, that would be 252, 150, and 198 pixels respectively.</p>
  
  <p>However, for any subsequent display sizes (i.e. iPhone 4 landscape (960 wide) or iPad 2 portrait (768 wide), I would like the relative percentages to be the same (not the pixel widths quoted above).</p>
  
  <p>Is there a way to do this using Storyboards (i.e. without code)?  I can do this easily in code, but my goal is to put as much of this display logic as possible into the Storyboard.</p>
  
  <p><img src="https://i.stack.imgur.com/3R5mv.png" alt="enter image description here"></p>