Detect UISearchToken selection in UISearchTextField?

Question

This should be simple perhaps I am missing it somewhere...

• How can I detect when a user selects / highlights a UISearchToken currently presented in a UISearchTextField?

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Here is a photo showing how I am trying to detect when the user selects a token: i.e. the "second" token was selected here

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For reference, I am developing this in Swift on iOS 16+.

Upon the user hitting the "return" key, I am adding tokens to the text field:

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    if addTokensOnReturn && !text!.isEmpty {
        insertToken(UISearchToken(icon: nil, text: text!), at: tokens.endIndex)
        text = ""
        return false
    }
    return false
}