cocoa播放音频 系统声效 

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NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"alert" ofType:@"wav"];
_sound = [[NSSound alloc] initWithContentsOfFile:resourcePath byReference:YES];

播放系统声效

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int soundIndex = 0;
- (void) tryLoopPlaySound{
    NSArray *directoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:@"/System/Library/Sounds"
                                                                                     error:nil];
    NSUInteger arrayCount = [directoryContents count];
    if (soundIndex < arrayCount-1) {
        soundIndex++;
    }
    else {
        soundIndex = 0;
    }
    [self playSystemSound:soundIndex];
}

-(void) playSystemSound:(int) index{
    NSArray *directoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:@"/System/Library/Sounds"
                                                                                     error:nil];
    NSUInteger arrayCount = [directoryContents count];
    if(index >= arrayCount) {
        return;
    }
    NSString *soundName = [directoryContents objectAtIndex:
                           index];
    soundName = [soundName stringByDeletingPathExtension];
    NSSound *systemSound = [NSSound soundNamed:soundName];
    NSLog(@"soundName %@ %d",soundName, index);
    [systemSound play];
}