Preload *.wav with SystemSoundID?

I am playing a wav file to give a little audio feedback when a button in my UI is pressed. My question is when you first press the button there is a delay (about 1.5secs) whilst the sound file "sound.wav" is loaded and cached. Is there a way to pre-cache this file (maybe in my viewDidLoad)? I guess I could do it by just playing it a viewDidLoad, but would really need to disable the audio so it does not "beeb" each time the app starts.

many thanks for and help.

gary

EDIT_001: Looks like my question is a duplicate of this post unless anyone has any new info? Maybe a way to turn the play volume down temporarily, unless the audio is cleared each time through the run loop.

EDIT_002: I am currently using SystemSoundID / AudioServices:

-(void)playButtonSound {
    NSBundle *bundle = [NSBundle mainBundle];
    NSString *soundPath = [bundle pathForResource:@"buttonClick_002" ofType:@"wa开发者_开发知识库v"];
    SystemSoundID soundID;
    AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:soundPath], &soundID);
    AudioServicesPlaySystemSound(soundID);
}

Use performSelectorInBackground:@selector(<A SELECTOR>) when the view loads to load the wav file into memory. Then play the sound when needed ;)

Hope this helps!

In the end I actually found that using AVAudioPlayer allowed my to do the preload that I required using (see below) in viewDidLoad to do the preload:

[audioPlayer prepareToPlay];

and then using (see below) in the button methods where I needed the sound to play on demand.

[audioPlayer play];

gary