In case that you have a scroll view and works fine in iPhone 4/4s with height 960 pixels, when you will try to use it on iPhone 5 you will see somenting like this:
a great white stripe.
Don’t try to use writing code, it’s even easier.
Select your UIScrollView
and change from:
to
Credits to Mr Nathan Christie
My code development blog 
Its not working..
can u plz explain it?
Well my friend,
first ensure that you select the UIScrollView from the interface builder Document Outline panel (first screenshot).
then access the autosizing control tab and make the changes. If you want you can also set the vertical and horizontal sizing arrows.
It works.