Question

I’m using the code in this answer to generate a grid of buttons.

When a button is clicked I want to change the button image. So I need to do something like:

- (void)buttonPressed:(id)sender {
        [toggleButton setImage:[UIImage imageNamed:toggleIsOn @"on.png"] 
        forState:UIControlStateNormal];
    }

But I don’t know how to assign toggleButton to the right button from the UI. I don’t have an outlet for every button. Any ideas how I can do this?

Answer 1

If you are changing the same button that has been pressed, this should work:

- (void)buttonPressed:(id)sender {
    [sender setImage:[UIImage imageNamed:toggleIsOn @"on.png"] forState:UIControlStateNormal];
}

This is because sender is the button that has been pressed.