AVAudioPlayer UIButton-第二按停止当前音频播放

Question

我有一个UIButton，当被触摸时会播放音频文件。 此刻连续两次触摸按钮会播放音频文件两次，而不是停止它。

我希望第二次单击停止音频文件，而不播放第二个实例。 任何建议将不胜感激。 谢谢

-(IBAction) buttonNoisePlay {

        NSString *pathsoundFile = [[NSBundle mainBundle] pathForResource:@"noise" ofType:@"mp4"];
        sound = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:pathsoundFile] error:NULL];
        sound.delegate = self;
        sound.numberOfLoops = -1;
        sound.volume = 1;   

            if(sound == nil || sound.playing == NO)  //if not playing
            {

                    [sound play];
            }
            else
            {
                    [sound stop];
            }
}

Answer 1

嗯，这就是我要做的，而且只播放一次：

-(void) playSound: (NSString *) strFileName
{       
    if(audioPlayer == nil || audioPlayer.playing == NO)  //check if it's already playing in case they dbl-tapped (or more) b/c we only want to play it once per found item
    {
        //Get the filename of the sound file:
        NSString *urlAddress = [NSString stringWithFormat:@"%@%@", [[NSBundle mainBundle] resourcePath], strFileName];

        //Get a URL for the sound file
        NSURL *url = [NSURL fileURLWithPath:urlAddress];
        NSError *error;

        //Use AVAudioPlayer to play the sound
        audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
        audioPlayer.numberOfLoops = 0;

        if (audioPlayer == nil)
            NSLog(@"audioPlayer nil Error:%@", [error description]);
        else
            [audioPlayer play];
    }
}

并在标题中：

AVAudioPlayer *audioPlayer;

在初始化audioPlayer之前，我可能还应该检查nil，所以它只完成了一次……但现在就可以了。

Answer 2

您可以执行以下操作：

-(IBAction) buttonNoisePlay {

    if(sound == nil || sound.playing == NO)  //if not playing
    {
        ...
        //if nil initialize

        [sound play];
    }
    else
    {
        [sound stop];
    }
}