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If you move your mouse over a link in Mail.app, you get such triangle and by clicking it you get instant preview of the link. Please give me a hint how to do this?

enter image description here

uchuugaka
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user1261347
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  • Assuming you know where the links are in the text, I think [this answer](http://stackoverflow.com/a/5312441/1362154 "answer") and the QuickLookDownloader code will be informative. – Smilin Brian Nov 16 '12 at 01:59

1 Answers1

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The square button with triangle that you see is an instance of NSDataDetector finding something useful. Search the docs and the sample code and WWDC session videos for NSDataDetector

uchuugaka
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