Can my app be rejected by Apple if I changed an UISeachBar background?

Will my ap开发者_开发问答p be rejected by Apple if I changed an UISearchBar background to be transparent?

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If you use 'private' APIs, or modify controls when Apple documentation says not to, then Apple may indeed reject your App. Possibly during initial review, or at a later date.

There is also the possibility that the API may change or be removed, without warning, causing your App to crash.

However, there are Apps in the App Store that clearly do use private APIs, and have been approved, but it's a risk you take. If that concerns you, don't do it.