Re: C callbacks with NSNotificationCenter?
Re: C callbacks with NSNotificationCenter?
- Subject: Re: C callbacks with NSNotificationCenter?
- From: Fritz Anderson <email@hidden>
- Date: Wed, 07 Sep 2016 11:41:00 -0500
“dangerwillrobinsondanger” correctly points to Core Foundation. I’m embarrassed to have forgotten — it should be very helpful to you, assuming it mixes with AVFoundation.
> On 7 Sep 2016, at 11:33 AM, じょいすじょん <email@hidden> wrote:
>
> Have you considered Core Foundation?
>
> https://developer.apple.com/library/ios/documentation/CoreFoundation/Reference/CFNotificationCenterRef/
> It is all C
>
> Another alternative is to look at the Objective-C runtime library routines.
> You can do a lot with the language from C...
>
>> On 2016 Sep 8, at 1:09, Andreas Falkenhahn <email@hidden> wrote:
>>
>> 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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