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IPhone UITextView - how do you know when the text you add is missing

I have a UITextView that I add texts from time to time, but I cannot find an API that tells me if the text I am adding is out of sight or not, so I can send a scrollToRange message to the UITextView, Is there a way to do this?

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Check content size every time you add text



UITextView *textView;
    if(textView.contentSize.height > textView.frame.size.height)
    {
        //your text is lager then view
    }
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