AVAudioPlayer fade volume out

Question

I have an AVAudioPlayer playing some audio (duh!)

The audio is initiated when the user presses a button. When they release it I want the audio to fade out.

I

Answer 1

This seems to me to be a descent use of an NSOperationQueue.

Hence here is my solution:

-(void) fadeIn
{
    if (self.currentPlayer.volume >= 1.0f) return;
    else {
        self.currentPlayer.volume+=0.10;
        __weak typeof (self) weakSelf = self;
        [NSThread sleepForTimeInterval:0.2f];
        [self.fadingQueue addOperationWithBlock:^{
            NSLog(@"fading in %.2f", self.currentPlayer.volume);
            [weakSelf fadeIn];
        }];
    }
}
-(void) fadeOut
{
    if (self.currentPlayer.volume <= 0.0f) return;
    else {
        self.currentPlayer.volume -=0.1;
        __weak typeof (self) weakSelf = self;
        [NSThread sleepForTimeInterval:0.2f];
        [self.fadingQueue addOperationWithBlock:^{
            NSLog(@"fading out %.2f", self.currentPlayer.volume);
            [weakSelf fadeOut];
        }];
    }
}