title: scrollview has ambiguous content width on Xcode 6
body: <p>I can't understand how can I solve this auto layout problem, i have this View:</p>
  
  <p><img src="https://i.stack.imgur.com/c4ddC.png" alt="enter image description here"></p>
  
  <p>There is an UIScrollView with the elements you see in the View, but the View gives me this warning:</p>
  
  <pre><code>scrollview has ambiguous content width
  </code></pre>
  
  <p>I can't understand how to solve this problem, I want the the view is for the full screen size, and I want that the width will be the screen width, how I can solve it?</p>