title: Autolayout: Incorrect Width when using ScrollView
body: <p>i´m using autolayout and followed the instruction from this guide:</p>
  
  <p><a href="http://www.g8production.com/post/57513133020/auto-layout-with-uiscrollview-how-to-use" rel="nofollow noreferrer">http://www.g8production.com/post/57513133020/auto-layout-with-uiscrollview-how-to-use</a></p>
  
  <p>I build my View with a xib File and Interface Builder. This is my Tree:</p>
  
  <p>-UIView</p>
  
  <p>--UIScrollView</p>
  
  <p>---UIView (ContentView)</p>
  
  <p>----SubViews</p>
  
  <p>The Problem is that when i only put <strong>ONE!</strong> Subview (an UIImageView) inside the ContentView and set a Left,Top and Right Constraint to the Subview, i get a warning which says: Autolayout expected a width of 1000!! I have no Idea why it gets so broken. All my Views have a width of 320px so that couldn´t be the Problem. 
  Here some Screenshots which may help:</p>
  
  <p><img src="https://i.stack.imgur.com/JcNlx.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/7BVUK.png" alt="enter image description here"></p>