iPhone CoreText: Find the pixel coordinates of a substring

Question

Here\'s a screenshot of the twitter app for reference: http://screencast.com/t/YmFmYmI4M

What I want to do is place a floating pop-over on top of a substring in an NSAtt

Answer 1

The link given by George was very helpful and got me what I wanted. But strange thing happened. It was working in iOS SDK 4.0 but in the iOS SDK 5 the position of the link appeared in wrong position on the view.

So I had to tweak the code a little bit. For the x coordinates of the touchable button, I had to use CTRunGetTypographicBounds instead of the CTRunGetImageBounds function.

So over all, in the tweaked code: The y Coordinate , width and height was calculated using CTRunGetImageBounds. And x coordinate was calculated using CTRunGetTypographicBounds.