Question

I have this code:

    int ran = 1 + arc4random() % 18;

    NSString *soundFileIs=[NSString stringWithFormat:@"ton%i.mp3",ran];
    NSString *paths = [[NSBundle mainBundle] resourcePath];
    NSString *audioFile = [paths stringByAppendingPathComponent:soundFileIs];
    NSData *cdata =[NSData dataWithContentsOfFile:audioFile];

    audioPlayer = [[AVAudioPlayer alloc] initWithData:cdata error:nil];
    audioPlayer.delegate = self;

    [audioPlayer play];

When I shake device, it plays random my 18 sounds. How can I make to stop previously playing sound, and play next sound? Everything works great, just I hear 1st sound when I shake for first time, when I shake 2nd time, i hear 1st and 2nd sound playing if my 1st sound didn’t stop play. Thank you.

Answer 1

Before playing anything, check to see if it’s already playing and call stop. Your code will then be:

int ran = 1 + arc4random() % 18;

NSString *soundFileIs=[NSString stringWithFormat:@"ton%i.mp3",ran];
NSString *paths = [[NSBundle mainBundle] resourcePath];
NSString *audioFile = [paths stringByAppendingPathComponent:soundFileIs];
NSData *cdata =[NSData dataWithContentsOfFile:audioFile];

if (audioPlayer.playing)
    [audioPlayer stop];

audioPlayer = [[AVAudioPlayer alloc] initWithData:cdata error:nil];
audioPlayer.delegate = self;

[audioPlayer play];