Setting a background image for highlighted state removes automatic highlight

0
votes

I'm implementing a checkbox subclass of a UIButton. There are 2 background images (on/off) and 4 conceptual states:

  • on - on image / not highlighted
  • off - off image / not highlighted
  • on & pressed - on image / highlighted
  • off & pressed - off image / highlighted

If I set background images for only on and off (UIControlStateNormal and UIControlStateSelected), the button gets highlighted when held.

However, when on & pressed, it uses the off image (as expected, because the state is UIControlStateSelected | UIControlStateHighlighted, so it uses the normal state image)

So I set the background image for UIControlStateSelected | UIControlStateHighlighted to be the on image, but now the programmatic highlight is disabled - I assume because if you set a specific background image for that state the logic is you probably want to override the highlight.

I don't want to use a third image, is it possible to set a background image for UIControlStateSelected | UIControlStateHighlighted and still have the programmatic highlight get applied?

I'm already calling [self setAdjustsImageWhenHighlighted:YES]; after setting the background image.

1
iosuibutton

1 Answers

0
votes

I guess you are using a UIButton whose type is not "custom" but e.g. "Rounded Rect". In this case setting a background image can have unexpected side effects, see my earlier question.
I suggest to change the button type to "custom". Then of course you have to define all attributes by your own.