how to get viewable text position after scroll a UITextView

Subject: how to get viewable text position after scroll a UITextView
From: hufey <email@hidden>
Date: Tue, 28 Jun 2011 16:25:36 +0800
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I have a UITextView and a slide control. The text view has a long
content to read. I need textview can interact with slide control. Now
I can drag slide to move text view text to corresponding percentage by
calculating position of slide control. I want to move slide indicator
position to corresponding position by scroll text view too.
But how I can get current viewable text position? Then I can calculate
its percentage to move slide.
BTW, I can use an inherit UITextView to catch event now.

Thanks,
hufey
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