title: adding uiimageview inside scrollview using auto layout is adding space at top and bottom
body: <p>I am trying to design iOS screen.I want to design screen showing imageview at top of screen and scrollview having another image view at bottom of screen. I want to design screens for iOS 6 and 6 plus</p>
  
  <p>I have added imageview at top with 400 width and 239 height (image size 750w and 448h).This scroll view should scroll in the app to show full image on screen.</p>
  
  <p>I have added scrollview and then imageview inside scrollview.My image size inside scrollview is 750 width and 1134 height.</p>
  
  <p>I can see width and height of total screen as 400w and 800h.</p>
  
  <p>I want to know </p>
  
  <ol>
  <li>What should be size of image inside imageview to have proper aspect ratio.</li>
  <li>I have created imageview of 400w,605h size. Scrollview is adding some extra space at top and bottom of screen.
  3.What should be constraint for fitting larger image inside scrollview.</li>
  </ol>
  
  <p>Extra space at top and bottom of scrollview is big problem for me</p>