Xamarin : Why the navigation bar not appearing - ios

I have a strange behaviour about the navigation bar. I used iPhone 8 plus emulator and my iPhone 5c to run my application. All the pages will see the navigation bar but one of the client using iPhone 8plus unable to see the navigation bar on one of the screen only.
In my code, I didn't hide the navigation bar. I want to know does anyone have the same issue.

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2 - I've put the tab bar inside a UI view.
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My problem is better described in the image below:
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I am developing an app (objective c) with a navigation controller. For some reason the whole app is offset from the top of the device. See below, can anyone give me some pointers as I have no idea.
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This problem occurs on iPhone SE and iPhone 7, the iPad 2 is ok. The xCode version is 8.1
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You need to use launch.storyboard in your Project or you need to add launch screens image in your Asset Folder for all the sizes, then this black screen from top and bottom will be removed.
In App Icons and Launch Images setting, you need to set asset and launch screen file. so this black bar will disappear.

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This has happened with three different apps I've worked on, with all sorts of devices. All of them are using UINavigationController through a storyboard.
I have seen this in several of my applications now, and I'm wondering if there's a setting I'm missing. Has anyone else seen this, or know why it happens?

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