UISegmentedControl.enabled = NO doesn't dim it

Question

I have a UISegmentedControl in a UIView in my popover that I want to disable in some cases. The segmented control is set up with Interface Builder in a nib file. Its IB "Enabled" checkbook is checked.

To disable it, I wrote:

self.segmentedControl.enabled = NO;  // or YES when I want it enabled

Which works to the extent that from there on the segmented control doesn't react to touch events.

However, there is no graphic feedback whatsoever. I would like the segmented control to dim (gray out) when it's disabled. I tried to set its highlighted property to NO as well, with no effect.

This should be possible as disabling the UISegmentedControl with Interface Builder produces the dimming effect that I want.

However, if I do that, my code then cannot re-enable it:

self.segmentedControl.enabled = YES;

will not make it enabled: even though it will start accepting touch events again, it will stay dimmed.

It's as if the IB "enabled" check box controller two properties: enabled and dimmed. But what is this dimmed property that I can't find?

What did I miss?

This is in the 4.3 iPad simulator.

(note that I am talking about the whole control, not its individual segments).

Edit: I investigated a bit further and I found out that disabling the segmented control in IB also sets its alpha property to 0.5.

When adding:

self.segmentedControl.alpha = 0.5; // or 1.0 if enabled

My app now seems to behave normally.

Am I right to think that setting the enabled property should also take care of the screen appearance?

Answer 1

I found that this works for each segment:

[self.segmentedControl setEnabled:NO forSegmentAtIndex:0];

The effect is subtle, but it does grey it out. To do all segments:

for(int index=0; index<self.segmentedControl.numberOfSegments; index++)
{
    [self.segmentedControl setEnabled:NO forSegmentAtIndex:index];
}