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PODetermine scroll offset for UITextView in UIScrollVIew
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  1. PODetermine scroll offset for UITextView in UIScrollVIew
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    copied!<p>I have <code>UITextView</code> and other views below and after textView in <code>UIScrollView</code>. When user enter text I change textView frame height on textView.contentSize.height. The idea is save the possibility for user see all text and other elements. I have some issue. When user tap I want to scroll to this line. And this must seems like: </p> <p><img src="https://i.stack.imgur.com/ldEEC.png" alt="enter image description here"></p> <p>I can't determine how calculate offset and always scroll to current caret like.</p> <p>My initial screen:</p> <p><img src="https://i.stack.imgur.com/XPpsH.png" alt="enter image description here"></p> <p>All views are subviews of <code>UIScrollView</code>. Every time when user enter <code>@"\n"</code> I change <code>UITextView</code> frame:</p> <pre><code>CGRect textViewFrame = textView.frame; CGSize textViewContentSize = textView.contentSize; NSLog(@"textView content size: %@", NSStringFromCGSize(textViewContentSize)); textViewFrame.size.height = textViewContentSize.height; [textView setFrame:textViewFrame]; </code></pre> <p>And I increment <code>UIScrollView</code> contentSize. My problem - I don't understand how to scroll to textView's <strong>CURSOR</strong> when it under keyboard. I try do something: </p> <pre><code>CGPoint cursorPosition = [textView caretRectForPosition:textView.selectedTextRange.start].origin; CGPoint relativeCursorPoint = [textView convertPoint:cursorPosition toView:scrollView]; if(textView.isFirstResponder &amp;&amp; relativeCursorPoint.y &gt;= scrollViewFrame.size.height + scrollView.contentOffset.y) { int offset = relativeCursorPoint.y - scrollViewFrame.size.height + 18.0f; //int offset = textViewRect.origin.y - scrollViewFrame.size.height + 18.0f; [scrollView setContentOffset:CGPointMake(0, offset) animated:YES]; } </code></pre> <p>But it didn't work.</p>
 

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