Specifying UISegmentedControlNoSegment to UISegmentedControl's selectedSegmentIndex has no Effect on iOS 13

Question

I am the maintainer of STAControls which subclasses various UIControls, one of which is UISegmentedControl. Within that project\'s sample app, I ha

Answer 1

Remove the segment, then create it again. Here's a version in Swift, which only works if you've got text segments (not images). It assumes you've got an Storyboard with a segmented control and a button.

class ViewController: UIViewController {
    @IBOutlet weak var segmentedControl: UISegmentedControl!

    @IBAction func clearSegmentedControl(_ sender: Any) {
        guard segmentedControl.selectedSegmentIndex >= 0 else {
            return
        }

        let index = self.segmentedControl.selectedSegmentIndex
        let title = self.segmentedControl.titleForSegment(at: index) ?? ""

        self.segmentedControl.removeSegment(at: self.segmentedControl.selectedSegmentIndex, animated: false)
        self.segmentedControl.insertSegment(withTitle: title, at: index, animated: false)
        self.segmentedControl.selectedSegmentIndex = UISegmentedControl.noSegment
    }
}

In the Simulator, I couldn't see any flickering. After removing such a selected segment, selectedSegmentIndex becomes -2. This is a bit weird so that's why I added the last line of code, which sets it to the noSegment constant.