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C callbacks with NSNotificationCenter?
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C callbacks with NSNotificationCenter?


  • Subject: C callbacks with NSNotificationCenter?
  • From: Andreas Falkenhahn <email@hidden>
  • Date: Wed, 07 Sep 2016 18:09:25 +0200

As a C programmer I'm trying to avoid Objective C whenever and wherever possible.
The good thing is that I can do most interaction with Cocoa from normal C functions.
I only had to write very few classes. Most of the Cocoa stuff can be done
from normal C functions just fine.

Now I'd like to subscribe to the AVPlayerItemDidPlayToEndTimeNotification
notification. In an Objective C class, this is purportedly done like this:

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(itemDidFinishPlaying:) name:AVPlayerItemDidPlayToEndTimeNotification object:playerItem];

This will call the "itemDidFinishPlaying" method in class "self" whenever
an AVPlayerItem has finished playing.

Of course, I can't use this code in a normal C function because there are
references to "self" and the selector thing doesn't look like it's compatible to
C. So I could just subclass AVPlayerItem and voila, everything's fine.

Still, I'm wondering: Is it also possible to have NSNotificationCenter call
a C function for me whenever the notification triggers? Can this somehow
be achieved or am I forced to use full Objective C here?

--
Best regards,
 Andreas Falkenhahn                          mailto:email@hidden

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