objective c - Stop a sound Before PLaying another

Question

I know that this has been asked before on here, but i didn't understand the responses. I am making a soundboard, and when you click one of the buttons to play a sound, i would like the one that was already playing to stop. I know i need to add AudioServicesDisposeSystemSoundID(soundID);, but where do i add it? Here is my code:

- (IBAction)beyond:(id)sender {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef =  CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"beyond" ,CFSTR ("wav") , NULL);
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
   }

- (IBAction)Years:(id)sender {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef =  CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"years" ,CFSTR ("wav") , NULL);
    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
   }

Answer 1

The problem here is you defined soundID as a local variable within your method, instead of as an instance variable within your class. When you use an instance variable, you can access it later from any method in the class.