Here are some tips on using Interface Builder to handle resizing.
- Take advantage of the Simulated Metrics in Interface Builder, as shown here:
To do so, select your top-level View, and open the Attribute Inspector. Then, you can select different sizes and orientations to see how your view responds. - Select the Autosizing options as shown here:
In your case, you want a fixed margin above, but a flexible margin below. Note that this is the opposite of the default for a toolbar because the iOS convention is for toolbars to be at the bottom of the view. - Realize that resizing due to rotation and different screen sizes can often be handled the same way. (Thus, if you handle portrait and landscape orientations using Autosizing, iPhone5 layout usually takes care of itself.)