title: Scroll View Size not match with the device screen in xcode
body: <p>Ok, I tried the page with several buttons but all of them will not fit in one screen.  So, I create the scroll view and the view and then put all of buttons inside the view. The storyboard look fine. Other devices such as iPhone 5 and 5S look fine but when I tried 6 and 6 plus, the size of scroll view was incorrect.  I couldn't figure what went wrong.</p>
  
  <p><a href="https://i.stack.imgur.com/dSv2w.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dSv2w.png" alt="storyboard"></a></p>
  
  <p><a href="https://i.stack.imgur.com/h4kTI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/h4kTI.png" alt="tree1"></a></p>
  
  <p><a href="https://i.stack.imgur.com/gglOl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gglOl.png" alt="tree2"></a></p>
  
  <p><a href="https://i.stack.imgur.com/8LJCx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8LJCx.png" alt="iPhone 5s"></a></p>
  
  <p><a href="https://i.stack.imgur.com/OAwjS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OAwjS.png" alt="iPhone 6"></a></p>