iOS Universal storyboard on iPhone 5 & 5s issue - ios

I would like to get some help on how to handle app (storyboard) is set to Universal.
When app run (with a single viewcontroller with a navbar) on a iPhone 5s simulator (with iOS 7.x), a thick black appears on top & bottom
iPhone 5s with iOS 7.x SDK
When switch to iPhone 5.0 with iOS 8.x simulator, no issue.
iPhone 5s with iOS 8.x SDK
Is there any code to fix (remove header & footer) gap in black?

The thick black bars on top and bottom (also known as letterboxing) are because you have no launch image for the 4-inch screen. Add one. Without this, your app is treated as if it were running on a 4s (3.5-inch screen).

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This is how app look like on iOS7 iPhone Simulator:
http://imgur.com/MtvgRZH
And this is how it look like on iOS6 iPhone Simulator:
http://imgur.com/AW21SdR
So why it is not showing imager but just this blue shadow ?
I am doing screanshots so it is a little bit a problem.
Also on
This is how app look like on iOS7 iPad Simulator:
http://imgur.com/haM3xIe
And this is how it look like on iOS6 iPad iPhone Simulator:
http://imgur.com/xiMQSzG
Also it loo like that iOS 6 add white background on imager on iPhone, but not on iPad.
http://imgur.com/AW21SdR
http://imgur.com/xiMQSzG
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And there there is no this blue shadow.
Any idea how to fix it in simulator ?

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