Risk to be rejected on custom UITabBar

I'm wondering if there's any risk to see the app rejected from the AppStore (iPhone app) if I modify the existing UITabBar making it slightly taller. I'm working on a custom uitabbar with custom background pattern that is also just a little bit taller (8px) than the default one. It additionally has a raised central button.

I really don't开发者_开发技巧 see why this could reject the app but I thought I would better ask first since it's quite a lot of work implementing this custom design and I might have overlooked some of the HIG guidelines/rules.

Many thanks, Tomas

There are tons of apps in the AppStore with custom tab bars, starting with some of the most popular ones like Instagram so you should be safe.

There are huge numbers of apps out there with custom tab bars, including non-standard sized ones and ones with protruding central buttons. They're fine, as long as they work correctly.