play back from - to snippet

playback.m

NSString *myAudioFileInBundle = @"words.mp3";
    NSTimeInterval wordStartsAt = 1.8;
    NSTimeInterval wordEndsAt = 6.5;
    NSString *filePath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:myAudioFileInBundle];
    NSURL *myFileURL = [NSURL fileURLWithPath:filePath];
    AVAudioPlayer *myPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:myFileURL error:nil];
    if (myPlayer) {
        [myPlayer setCurrentTime:wordStartsAt];
        [myPlayer prepareToPlay];
        [myPlayer play];
        [NSTimer 
         scheduledTimerWithTimeInterval:wordEndsAt-wordStartsAt
         target:myPlayer.autorelease
         selector:@selector(stop)
         userInfo:nil
         repeats:NO];

    }

//http://stackoverflow.com/questions/7105786/ios-stop-audio-playback-at-certain-time-avaudioplayer-end-time