Swift UITapGestureRecognizer not working as intended

Question

I have a simple UITapGestureRecognizer and a print statement inserted in its corresponding method. The following is the code I have written:

let tap = UITapGestureRecognizer(target: self, action: #selector(self.segmentTapped(sender:)))
tap.numberOfTapsRequired = 1
self.segmentedControl.addGestureRecognizer(tap)

That code above is executed in the viewDidLoad method.

In addition, its target method is:

func segmentTapped(sender: UITapGestureRecognizer) {
    print("called")
}

The problem that exists with the program is that the word "called" is only printed in the console when the segmentedControl is tapped twice. It is not printed out if it is simply tapped once. I am confused as to why this is happening, because I have set the numberOfTapsRequired property of the gesture to 1.

Answer 1

Since you are using segmentedControl to perform the desired action. Instead of adding GestureRecognizer for segmentedControl you can use action for the segmentedControl. Just like :

@IBAction func segmentControlValueChanged(_ sender: UISegmentedControl) {

if segmentControl.selectedSegmentIndex == 0 {
   print("called")
   } else {
    // do something else
 }
}

OR

you can even use

self.yourSegmentedControl.addTarget(self, action:#selector(segmentTapped(_:)), forControlEvents: .ValueChanged)

func segmentTapped(sender: UISegmentedControl)
{ 
   print("called")
// Do what you want
}