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Editorial Team
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Asked: 2026-05-31T13:37:15+00:00

Here is my problem. I am customizing a UISegmentedControl by setting the background and

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Here is my problem. I am customizing a UISegmentedControl by setting the background and divider images in the following way:

[[UISegmentedControl appearance] setDividerImage:segmentUnselectedUnselected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:segUnselectedSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];

[[UISegmentedControl appearance] setBackgroundImage:segmentUnselected forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setBackgroundImage:segmentSelected forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];

When I try to make the 1st segmented selected within viewDidLoad

self.segmentedControl.selectedIndex = 1;

I get the following weird thing:

enter image description here

instead of:

enter image description here

Does anyone know if this is a bug and how could I provide a bug report? If not, what could be wrong with my code?

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1 Answer

  1. Editorial Team

    After doing some tests and trying several different locations for the customization, I believe this may indeed be a bug.

    Even with a very simple straight UISegmentedControl, this is what I get (using Xcode 4.3.1, iOS 5.1):

    After launching and selecting the middle element in code:
    After launching and selecting the middle element in code

    After user-clicked away and clicking back on middle element:
    After user-clicked away and clicking back on middle element

    I used 3px wide images for the separators and 1px wide images for the backgrounds.

    Edit:
    I think I found a workaround: try queueing the instruction to select the element, rather than executing it in viewDidLoad, like this: 

    dispatch_async(dispatch_get_main_queue(),^{
   self.segmentedControl.selectedSegmentIndex = 1;
});

    On my example above, queuing that instruction makes it work just fine.

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