iOS how to play .caf local music?

it can support to play .caf music?

On iOS it is possible but not on any other platform.
It depends on what is inside it, as caf files are containers.
We support AudioQueue which supports caf and a number of other files.
Normally it is only recommended to use caf for AAC or Apple Lossless, anything else and you would be best off using something different.

ok, thank you very much!