Trigger AVAudioPlayer to stop all sounds and play selected except when playing(selected) button is clicked

问题

I am creating a sound board app that plays one sound at a time. I would like a UIButton to be able to stop all other sounds playing and start playing its own sound when clicked. I have a single AVAudioPlayer set up to play all sounds (I change the sound file url when clicked and since I only want one sound at a time playing this is not an issue). I would like to know how to stop all other sounds and play the sound according to the button pressed, but if the button clicked is the button with the sound currently playing, the button only stops the sound. I know this is achievable through going to separate audioplayers and triggering the stop event but I want to avoid copy and pasting code and to stay efficient as possible, plus I only want / need a single audioplayer. Here is my code:

- (IBAction)play {
 if (audioPlayer.playing == NO) {
    NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/k.mp3", [[NSBundle mainBundle] resourcePath]]];
    NSError *error;
     [audioPlayer release];
     audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    audioPlayer.numberOfLoops = 0;

    AVAudioSession *audiosession = [AVAudioSession sharedInstance];
    [audiosession setCategory:AVAudioSessionCategoryAmbient error:nil];

    [audioPlayer play];
    [start setTitle:@"Stop" forState:UIControlStateNormal];
}
 else
     if (audioPlayer.playing == YES) {
         [audioPlayer stop];
     [start setTitle:@"Start" forState:UIControlStateNormal];
    }
    }


- (IBAction)play2 {
if (audioPlayer.playing == NO) {
    NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/chicken.mp3", [[NSBundle mainBundle] resourcePath]]];
    NSError *error;
    [audioPlayer release];
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    audioPlayer.numberOfLoops = 0;

    AVAudioSession *audiosession = [AVAudioSession sharedInstance];
    [audiosession setCategory:AVAudioSessionCategoryAmbient error:nil];

    [audioPlayer play];
    [start2 setTitle:@"Stop" forState:UIControlStateNormal];
} else
    if (audioPlayer.playing == YES) {
        [audioPlayer stop];
        [start2 setTitle:@"Start" forState:UIControlStateNormal];
    }
}

Any help is appreciated. Thank you in advance!

回答1:

Just do this

-(void)stopAudio{

if(audioPlayer && [audioPlayer isPlaying]){
    [audioPlayer stop];
    audioPlayer=nil;
}

}

And call this function on every click..

- (IBAction)play2 {
    [self stopAudio];

    //Do your Stuffs
}

回答2:

when your button is clicked stop your audio player and assign your new song url and then play it.Write this code when you click on button to play song.

if(audioPlayer.isPlaying)
      [audioPlayer stop];    

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSURL *url = [NSURL fileURLWithPath:YourSoundURL];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.delegate=self;
[audioPlayer play];
[start2 setTitle:@"Stop" forState:UIControlStateNormal];

来源：https://stackoverflow.com/questions/15357126/trigger-avaudioplayer-to-stop-all-sounds-and-play-selected-except-when-playings

标签

ios

objective-c

xcode

avaudioplayer