Hello,
I have a question about release/retain and properties. Now I get the
whole "if you allocate it, you have to release
it", but with properties I need some clarification. I'm using an
AVAudioPlayer to play a sound, and I'm initializing
it in the viewDidLoad by calling a routine to get the sound. Some sample code:
In my view controller .h file :
@interface AudioPlayerViewController : UIViewController {
AVAudioPlayer *audioPlayer;
}
@property (retain) AVAudioPlayer *audioPlayer;
In the .m file:
@synthesize audioPlayer;
in viewDidLoad:
audioPlayer = [self getSoundFile:"soundfile.wav"];
...
in getSoundFile routine:
AVAudioPlayer *snd;
...
snd = [[[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]
autorelease];
...
return snd;
Now (I did copy the code from a sample, that had the autorelease in
it) if I try to play the
sound, it crashes. If I remove the autorelease it's fine. I just want
to understand what's going on.
I know using the (retain) in the property declaration will use retains
when setting the property. Assuming
the autorelease is not there, in my getSoundFile routine, the
alloc/init would return a retained object
(correct?) Then in my viewDidLoad routine when I get the sound, does
the assignment do another retain?
Should I keep the autorelease and assign it with:
audioPlayer = [[self getSoundFile:"soundfile.wav"] retain];
(side note... should that be self.audioPlayer = ... ? I keep getting
confused with accessors vs. ivars too ;) )
I hope that made sense :) Thanks for any input / hints.
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