UISegmentedControl register taps on selected segment
iphone, uisegmentedcontrol
Solution
You can subclass `UISegmentedControl`, and then `override setSelectedSegmentIndex:`
- (void) setSelectedSegmentIndex:(NSInteger)toValue {
if (self.selectedSegmentIndex == toValue) {
[super setSelectedSegmentIndex:UISegmentedControlNoSegment];
} else {
[super setSelectedSegmentIndex:toValue];
}
}
If using IB, make sure you set the class of your `UISegmentedControl` to your subclass.
Now you can listen for the same `UIControlEventValueChanged` as you would normally, except if the user deselected the segment, you will see a `selectedSegmentIndex` equal to `UISegmentedControlNoSegment`:
-(IBAction) valueChanged: (id) sender {
UISegmentedControl *segmentedControl = (UISegmentedControl*) sender;
switch ([segmentedControl selectedSegmentIndex]) {
case 0:
// do something
break;
case 1:
// do something
break;
case UISegmentedControlNoSegment:
// do something
break;
default:
NSLog(@"No option for: %d", [segmentedControl selectedSegmentIndex]);
}
}
Problem
I have a segmented control where the user can select how to order a list. Works fine. However, I would like that when an already selected segment is tapped, the order gets inverted. I have all the code in place, but I don't know how to register the taps on those segments. It seems the only control event you can use is UIControlEventValueChanged, but that isn't working (since the selected segment isn't actually changing). Is there a solution for this? And if so, what is it? Thanks in advance!