UISegmentedControl register taps on selected segment

Question

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 orde

Answer 1

Seems like a fun question to answer. This scheme expands upon Steve E's and yershuachu's solutions. This version uses a UITapGestureRecognizer to capture all touches and which sets the selectedSegmentIndex to -1; but it also passes on all touches to the UISegmentedControl so it can handle any normal touches. No subclassing is required.

UISegmentedControl *mySegControl;

- (void)viewDidLoad
{
    [super viewDidLoad];

    [mySegControl addTarget:self action:@selector(segmentAction:)
           forControlEvents:UIControlEventValueChanged];
    // allow the a seg button tap to be seen even if already selected
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]
                                          initWithTarget:self action:@selector(unitsSegTap:)];
    tapGesture.cancelsTouchesInView = NO; // pass touches through for normal taps
    [mySegControl addGestureRecognizer:tapGesture];

    // continue setup ...
}

- (void)segTap:(UITapGestureRecognizer *)sender
{
    mySegControl.selectedSegmentIndex = -1;
}

// called for UIControlEventValueChanged
- (void)segmentAction:(UISegmentedControl *)sender
{
    NSInteger index = sender.selectedSegmentIndex;
    NSLog(@"unitsSegmentAction %d",(int)index);
    // process the segment
}