How to center a bar button item in navigation bar in swift using storyboard? - ios

I'm trying to have 3 bar button items in my navigation bar in my swift project.
I can drag/drop the buttons in my navigation bar using storyboard but the buttons will go to the left or right of the navigation bar!
I need to have 1 of these 3 buttons to sit in the middle of the navigation bar so I can use it as a Logo.
I've tried to use the Flexible space bar item as well with no success. I have nothing else in my navigation bar other than these 3 buttons.
could someone please advice on this issue?

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Thanks
here is the steps :
Add a Tab bar to your View controller .
Drag a tab bar item and add it to you tab bar like so
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I m using NJKSCROLLFULLSCREEN for reference..http://GitHub.com/ninjakin/NJKSrollfullScreen
Here is some screenshots of my project..this is what the problem with my tab bar when it hides..!
this is main screen and I want it will look like!
Use https://github.com/tristanhimmelman/HidingNavigationBar
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