some new UI not shown on U5 for IOS.Strangely

Unity Engine
1

Everything works fine but when I compile to IOS(ipad itested).
Some buttons were just missing!

I dont think it was the resolusion problem bucause I think my screen-fit setting is not wrong enough to even not shown the buttons on the middle of screen.
I tested every resolusion on editor,all works as I expected(position and scaling)
and I also tested the game some wp8,everything just work right.

Just strangely missing something on IOS…No error on xcode log also.

2

ok this is end.
The default uicam I set distance 100 which would be covered by the game layer even the depth only camera is setting at a forward depth.