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

Because the UISegmentedControl is in charge of setting the segment, it should only reset the state. I modify a little the suggestions of other guys for swift 5:

//MARK: Custom segmentedControl
///  Every element works like a flipflop  [see](http://stackoverflow.com/questions/17652773/how-to-deselect-a-segment-in-segmented-control-button-permanently-till-its-click)
@IBDesignable class GRSegmentedControl: UISegmentedControl {
  private let url = Bundle.main.url(forResource: "PlopChoiceCntrl", withExtension: "aiff")!
  private var soundID:SystemSoundID = 0

  override init(items: [Any]?) {
    AudioServicesCreateSystemSoundID(url as CFURL, &soundID)
    super.init(items: items)
  }

  required init?(coder: NSCoder) {
    AudioServicesCreateSystemSoundID(url as CFURL, &soundID)
    super.init(coder: coder)
  }

  override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    AudioServicesPlaySystemSound(soundID)
    let previousSelectedSegmentIndex = self.selectedSegmentIndex
    super.touchesEnded(touches, with: event)
    if previousSelectedSegmentIndex == self.selectedSegmentIndex {
      if let touch = touches.first{
        let touchLocation = touch.location(in: self)
        if bounds.contains(touchLocation) {
          self.selectedSegmentIndex = UISegmentedControl.noSegment
        }
      }
    }
  }
}

Answer 2

This works:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    int oldValue = self.selectedSegmentIndex;
    [super touchesBegan:touches withEvent:event];
    if (oldValue == self.selectedSegmentIndex)
    {
        [super setSelectedSegmentIndex:UISegmentedControlNoSegment];
        [self sendActionsForControlEvents:UIControlEventValueChanged];
    }
}

Answer 3

Below the piece of code that did work for me. Repeated tap on the same segment will deselect it.

@implementation WUUnselectableSegmentedControl
{
    NSUInteger _selectedIndexBeforeTouches;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    _selectedIndexBeforeTouches = self.selectedSegmentIndex;
    [super touchesBegan:touches withEvent:event];
}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];

    if (_selectedIndexBeforeTouches == self.selectedSegmentIndex)
    {
        // Selection didn't change after touch - deselect
        self.selectedSegmentIndex = UISegmentedControlNoSegment;
        [self sendActionsForControlEvents:UIControlEventValueChanged];
    }
}

@end

Answer 4

The current solution presented still does not work, because setSelectedSegmentIndex is never called unless really a new segment is tapped. At least in my case this never worked, I do use iOS5 though, perhaps this solution did work in iOS4. Anyway, this is my solution. It needs one extra subclass method, which is the following:

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{    
    [self setSelectedSegmentIndex:self.selectedSegmentIndex];
    [super touchesEnded:touches withEvent:event];
}

Good luck!

Answer 5

Swift 5

class ReselectableSegmentedControl: UISegmentedControl {
    // Captures existing selected segment on touchesBegan.
    var oldValue: Int!

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.oldValue = self.selectedSegmentIndex
        super.touchesBegan(touches, with: event)
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)

        if self.oldValue == self.selectedSegmentIndex {
            self.sendActions(for: .valueChanged)
        }
    }
}

From here

Answer 6

I'm using KVO to invert already selected segment for iOS8.

#import "QCSegmentedControl.h"

static void *QCSegmentedControlContext = &QCSegmentedControlContext;

@implementation QCSegmentedControl

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        [self registerKVO];
    }

    return self;
}

- (void)dealloc {
    [self removeObserver:self forKeyPath:@"selectedSegmentIndex"];
}

#pragma mark -

- (void)registerKVO {
    [self addObserver:self
           forKeyPath:@"selectedSegmentIndex"
              options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld)
              context:QCSegmentedControlContext];
}

- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context {
    if (context == QCSegmentedControlContext) {
        NSNumber *new = change[NSKeyValueChangeNewKey];
        NSNumber *old = change[NSKeyValueChangeOldKey];
        if (new.integerValue == old.integerValue) {
            self.selectedSegmentIndex = UISegmentedControlNoSegment;
        }
    }
}

@end