Question

I will try to explain my problem as clear as I can.
I have a piano that you can play and record the song what you do, and every button of the piano that you play, this button is highlighted. The problem is that I have another button to play the song that I have recorded, but what I want is to Highlight every button of the piano that is sounding.
Here is a part of the function I’ve coded:

- (IBAction)play:(id)sender
{   
    for(NSString *string in [Singleton sharedInstance].notesMusicals)
        if([string isEqualToString:@"doMenor"]){
            UIImage *buttonImage = [UIImage imageNamed:@"do-menor_ON.png"];
            [doMenorButton setImage:buttonImage forState:UIControlStateNormal];
            CFBundleRef mainBundle = CFBundleGetMainBundle();
            CFURLRef soundFileURLRef;
            soundFileURLRef = CFBundleCopyResourceURL(mainBundle,(CFStringRef) @"Do_m", CFSTR ("mp3"), NULL);
            UInt32 soundID;
            AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
            AudioServicesPlaySystemSound(soundID);
            //doMenorButton.highlighted = YES;
             sleep(1);

        }
        else if([string isEqualToString:@"Re"]){
            UIImage *buttonImage = [UIImage imageNamed:@"do-menor_OFF.png"];
            [doMenorButton setImage:buttonImage forState:UIControlStateNormal];
            UIImage *buttonImage1 = [UIImage imageNamed:@"re_ON.png"];
            [reButton setImage:buttonImage1 forState:UIControlStateNormal];
            CFBundleRef mainBundle = CFBundleGetMainBundle();
            CFURLRef soundFileURLRef;
            soundFileURLRef = CFBundleCopyResourceURL(mainBundle,(CFStringRef) @"Re", CFSTR ("mp3"), NULL);
            UInt32 soundID;
            AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
            AudioServicesPlaySystemSound(soundID);
            sleep(1);

        }

You can see that in every note, I highlight the button of that note, but the problem I have is that the button is only highlighted once the function ends, so all my notes will be highlighted once the melody has finished.
I hope someone can help me.

Answer 1

Try to call your highlightning code in a separate thread with

[self performSelectorInBackground:@selector(myMethod:) withObject:_myParamsArray];

For example:

...
        else if([string isEqualToString:@"Re"]){
            [self performSelectorInBackground:@selector(highlight:) withObject:myButton];
            CFBundleRef mainBundle = CFBundleGetMainBundle();
            CFURLRef soundFileURLRef;
            soundFileURLRef = CFBundleCopyResourceURL(mainBundle,(CFStringRef) @"Re", CFSTR ("mp3"), NULL);
            UInt32 soundID;
            AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
            AudioServicesPlaySystemSound(soundID);
            sleep(1);

        }

...

-(void) highlight:(UIButton)*button
{
                UIImage *buttonImage1 = [UIImage imageNamed:@"re_ON.png"];
                [button setImage:buttonImage1 forState:UIControlStateNormal];
}

Please excuse if there are any typos in the code. I modified it right here in the editor.

You’ll need to modify me example in order to deactive other highlighted buttons but that should be no problem