UISegmentedControl with action for tap on selected segment

UISegmentedControl.swift

// Code for ViewController

import UIKit

class UIViewController {
    
    @IBOutlet weak var segmentedControl: SegmentedControl!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        segmentedControl.addTarget(self, action: "tapSegment:", forControlEvents:.TouchDown)
    }
   
    func tapSegment(sender: UISegmentedControl) {
        // Action for touchDown-Event on an already selected segment
    }
}

// Code for SegmentedControl 

import UIKit

class SegmentedControl: UISegmentedControl {

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let currentIndex = selectedSegmentIndex
        super.touchesBegan(touches, withEvent: event)
        
        if currentIndex == selectedSegmentIndex {
            sendActionsForControlEvents(UIControlEvents.TouchDown)
        }
    }
}