Question

I am having trouble converting a CFDataRef into NSData whilst using ARC. I am using the __bridge_transfer OR __bridge cast but it is not working. Could anyone suggest me some other way of casting this two types.
I get the following error

Automatic Reference Counting Issue: Incompatible types casting 'CFDataRef *' (aka 'const struct __CFData **') to 'NSData *' with a __bridge cast

Answer 1

NSData *my_nsdata = (__bridge_transfer NSData*)my_cfdata; // -1 on the my_cfdata

or

NSData *my_nsdata = (__bridge NSData*)my_cfdata; // no adjustment of retain counts.

From my blog post here:

http://amattn.com/2011/12/07/arc_best_practices.html