Missing Identifier for Radio Button when trying to identify the Sender

Question

I'm trying to identify the clicked radio button using the Interface builder identifier.

 @IBAction func text_radio_changed(_ sender: Any) {
        let button:NSButton = sender as! NSButton
        let id:String = button.accessibilityIdentifier()
        print("===========>"+id)
    }

But the console keeps printing this

===========>

There is no identifier

Answer 1

button.accessibilityIdentifier is the Accessibility Identity Identifier. The Identity Identifier is button.identifier.

@IBAction func text_radio_changed(_ sender: Any) {
    let button:NSButton = sender as! NSButton
    let id:String = button.identifier!.rawValue
    print("===========>"+id)
}