I could successfully add tap gestures to a part of UITextView with the following code:
UITextPosition *pos = textView.endOfDocument;// textView ~ UITextView
You could try https://github.com/mattt/TTTAttributedLabel and add a link to the label. When the link is pressed you get a action, so part of the label click works only thing you have to would be customizing the link part of the label. I tried this in the past and it worked flawlessly but my client was not interested in using a third party component so duplicated this functionality using UIWebView and HTML.