Is there a way to wrap an ObjectiveC block into function pointer?

Question

I have to provide a C-style callback for a specific C library in an iOS app. The callback has no void *userData or something similar. So I am not able to loop i

Answer 1

If your block needs context information, and the callback does not offer any context, I'm afraid the answer is a clear no. Blocks have to store context information somewhere, so you will never be able to cast such a block into a no-arguments function pointer.

A carefully designed global variable approach is probably the best solution in this case.