IOS local notification: I would like to execute a function when re-entering the app via the local notificaion

I am new to iOS programming and also working with XCode 4.6 and trying to create a local notification function that will execute the function when I re-enter the application. Basically, I would like to change the text on some shortcuts and add a sound when re-entering the application. I thought I was on the right track, but only some parts of my code work when I log into my app again via local notification.

I first added this function to my AppDelegate:

-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
    NSLog(@"test1");   //this traces successfully 
    myAppViewController * controller = [myAppViewController alloc];
    [controller doSomething];  //calling a function in my myAppViewController.m
}

      

        
        
        
      

    

I thought I figured it out, but now in my function in myAppViewController.m only NSLog works:

-(void)doSomething{
    NSLog(@"do something"); //traces successfully 
    self.notificationTime.text=@"something else"; //nothing happens here, it works in other functions but not here
    [self doSomethingElse]; //calling another function from this function for further testing 
}

      

        
        
        
      

    

The next function is called ....

-(void)doSomethingElse{
    NSLog(@"do something else"); //this works
    //this whole thing doesn't work -- no sound -- 
    NSURL* url = [[NSBundle mainBundle] URLForResource:@"cash" withExtension:@"mp3"];
    NSAssert(url, @"URL is valid.");
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    [self.player prepareToPlay];
    [self.player play];
    //this doesn't work again
    self.notificationTime.text=@"something else";
}

      

        
        
        
      

    

I was hoping for some general advice here and that would be greatly appreciated. If anyone knows a completely different way of solving the problem, that would be great!