objective c - 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 have the following code (can be downloaded from the aforementioned link):

- (void)textFieldDidEndEditing:(UITextField *)textField {
    NSInteger integer = [textField.text integerValue];
    if (integer < 0 || integer >= self.segmentedControl.numberOfSegments) { this doesn't work
        self.segmentedControl.selectedSegmentIndex = UISegmentedControlNoSegment;
    } else { // this works
        self.segmentedControl.selectedSegmentIndex = integer;
    }
}

In iOS 13 the UISegmentedControlNoSegment assignment is not respected:

While in iOS 12 and prior versions of iOS this performs just fine:

Any idea(s) on how to work around this?

Answer 1

The solutions given in the other answers are overblown. There is a much simpler workaround: just call setNeedsLayout on the segmented control.

self.seg.selectedSegmentIndex = UISegmentedControl.noSegment
self.seg.setNeedsLayout()