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.
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