Thank you for your post and screen shots.
I am unable to replicate the issue. That is, my Button Bar appears in the Navigation Bar when viewing on an iOS device.
Are there anchors (if any) for the Button Bar? Specifically, the right anchor?
What are the positions (Left, Right, Top and Bottom) of the Button Bar?
If you turn your device to landscape, does any part of the Button Bar appear?
Any other information you can provide may be helpful in narrowing down the possible causes.
The only anchors on the Button bar are left and top.
I have turned my device sideways, and the button bar is still not viewable from iOS.
I have tried something else right now. Previously I had the button bar to the right of the layout just about where it ends as seen on the picture.
For some reason, the iOS does not place the Button bar like it is on the client layout.
I moved the button bar to the far left of the navigation bar, and it shows up.
I then played and started sliding the button bar little by little to the right, and there is a limit to how far to the right I can have it go before the iOS device stops showing it.
Regardless if I have to slide to view the rest of the layout, the navigation bar does not.