40media Scrolling to range in UITextView


Scrolling to range in UITextView



I have a UITextView with text in it, and I want to be able to scroll it such that a given NSRange of the text is at the top of the view. Using scrollRangeToVisible: does not work: it will scroll the range such that it is somewhere in the view, not necessarily where I want it to be. How can I scroll such that this specific NSRange of text in the UITextView is exactly at the top?

Thanks for any suggestions.




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The only answer that comes to mind is to work out the contentOffset yourself.


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Use NSString -sizeWithFont:forWidth:lineBreakMode: sizeWithFont:constrainedToSize:lineBreakMode: to work out the size of the box immediately above the text you want (this may be tricky if the text doesn't have to start the line; you may have to try several ranges to find the one that causes the height to jump).


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That should give you the contentOffset you need for UIScrollView -setContentOffset:animated:.


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I'm a little worried about the performance, and it may turn out necessary to create your own implementation of UITextView to be efficient (which shouldn't be that difficult if it's static content)..
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