How can I detect the selectedSegmentIndex when long-pressing down?

Question

UILongPressGestureRecognizer got added to UISegmentedControl. Is there a way to detect selectedSegmentIndex when long-pressing down? thanks, in advance.

Answer 1

Did you try adding a UILongPressGestureRecognizer to it? In viewDidLoad:

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
longPress.delegate = self;
[segmentedControl addGestureRecognizer:longPress];

Don't forget to add UIGestureRecognizerDelegate to your header file.

To know where is pressed:

- (void)longPress:(UILongPressGestureRecognizer *)gestureRecognizer {
    CGPoint p = [gestureRecognizer locationInView:segmentedControl];
}

Then you could check what segment of segmentedControl matches with CGPoint p, check for the Y-coordinate, for example. When it's left from the middle line of the UISegmentedControl it's segment 0, when it's right of that line it's segment 1.

Answer 2

You register for long press in UISegmentedControl

  let longPress = UILongPressGestureRecognizer(target: self, action: #selector(ListQuizViewController.segmentLongPress(_:)))
    //longPress.delegate = self;
    self.segmentedControl.addGestureRecognizer(longPress)
    longPress.minimumPressDuration = 1

You get index of selected button as follows with the assumption that segments are equally spaced

 func segmentLongPress(gestureRecognizer:UILongPressGestureRecognizer)
    {
        let p = gestureRecognizer.locationInView(self.segmentedControl)
        let index = Int(ceil( p.x/(self.segmentedControl.frame.width/4))) - 1
       self.segmentedControl.selectedSegmentIndex = index

    }