As I checked your sample project I found that You made your viewController size to iPhone4.7 inch
...and I checked the source code of storyboard and I found that targetRuntime="iOS.CocoaTouch"
So, at the time of preview,it just copied the reference for preview which is basically iPhone size and display you the iPhone size preview...
For the solution what I do is...just change in Storyboard source code..
Search for targetRuntime="iOS.CocoaTouch"
and change it to targetRuntime="iOS.CocoaTouch.iPad"
and then just check preview...and you can see that it works fine....
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