UIPicker detect tap / touch on currently selected row

PickerDetectTap.m

// Obj-C
// GestureRecognizer
UITapGestureRecognizer *tapToSelect = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tappedToSelectRow:)];
tapToSelect.delegate = self;
[self.pickerView addGestureRecognizer:tapToSelect];

#pragma mark - Actions

- (IBAction)tappedToSelectRow:(UITapGestureRecognizer *)tapRecognizer
{
    if (tapRecognizer.state == UIGestureRecognizerStateEnded) {
        CGFloat rowHeight = [self.pickerView rowSizeForComponent:0].height;
        CGRect selectedRowFrame = CGRectInset(self.pickerView.bounds, 0.0, (CGRectGetHeight(self.pickerView.frame) - rowHeight) / 2.0 );
        BOOL userTappedOnSelectedRow = (CGRectContainsPoint(selectedRowFrame, [tapRecognizer locationInView:self.pickerView]));
        if (userTappedOnSelectedRow) {
            // NSInteger selectedRow = [self.pickerView selectedRowInComponent:0];
            // [self pickerView:self.pickerView didSelectRow:selectedRow inComponent:0];
            // .. your action here ..
        }
    }
}

#pragma mark - UIGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return true;
}

PickerDetectTap.swift

// MARK: Swift
// GestureRecognizer
let tapToSelect = UITapGestureRecognizer(target: self, action: #selector(tappedToSelectRow(_:)))
tapToSelect.delegate = self
topicsPicker.addGestureRecognizer(tapToSelect)

// MARK: Actions

func tappedToSelectRow(tapRecognizer: UITapGestureRecognizer) {
        if tapRecognizer.state == .Ended {
            let rowHeight = topicsPicker.rowSizeForComponent(0).height
            let selectedRowFrame = CGRectInset(topicsPicker.bounds, 0, (CGRectGetHeight(topicsPicker.frame) - rowHeight) / 2.0)
            let userTappedOnSelectedRow = (CGRectContainsPoint(selectedRowFrame, tapRecognizer.locationInView(topicsPicker)))
            if userTappedOnSelectedRow {
                // let selectedRow = topicsPicker.selectedRowInComponent(0)
                // topicsPicker.selectRow(selectedRow, inComponent: 0, animated: false)
                // .. your action here ..
            }
        }
    }
    
// MARK: UIGestureRecognizerDelegate
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

UIPicker detect tap / touch on currently selected row
from stackoverflow