var mentionTextView = MentionTextView()
view.addSubview(mentionTextView)

// initial text with mention.
mentionTextView.setMentionText("www.google.com or [magicmon]", 
                               pattern: .mention,
                               prefixMention: "@")
mentionTextView.deleteType = .cancel // or .delete

// add to mention.
mentionTextView.insert(to: "anonymous", with: mentionTextView.selectedRange)

var textLabel = MentionLabel()
view.addSubview(textLabel)

textLabel.setMentionText(mentionTextView.mentionText,
                         pattern: .mention,
                         prefixMention: "@")

// or Add the text of the mention inside special characters "[]".
textLabel.setMentionText("[Brad Pitt]")

// show the mention text.
textLabel.tapHandler = { (mention) in
  let alert = UIAlertController(title: "", message: mention, preferredStyle: .alert)
  alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
  self.present(alert, animated: true, completion: nil)
}