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POTrouble when trying to change UITextView height dynamically
 

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  1. POTrouble when trying to change UITextView height dynamically
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    <p>I'm using iOS7.</p> <p>I want to change the height of my UITextView dynamically according to the content height. However, I find in iOS7, the contentSize is a mess. For example, when I delete a line, the contentSize will not change, but I expect its height to decrease.</p> <p>So I write the following </p> <pre><code>- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { // increase a line if ([text isEqualToString:@"\n"]) { _FRAME_SET_H(textView, textView.contentSize.height + 24.0f); // decrease a line } else if (range.length == 1 &amp;&amp; [textView.text hasSuffix:@"\n"]) { _FRAME_SET_H(textView, textView.contentSize.height - 24.0f); } else { _FRAME_SET_H(textView, textView.contentSize.height); } return YES; } </code></pre> <p>Everything works fine, until I input a very long text:</p> <p><img src="https://i.stack.imgur.com/5TXad.png" alt="enter image description here"></p> <p>The contentSize will not change when the text is long enough to cause a automatically line change!</p> <p>Could anyone help me?</p> <p>What I want is simple: change the height of the UITextView according to its content. However, I have spent more than two days on it, but still not solved. </p> <p>The UITextView in iOS7 is so bug.</p> <hr> <p>I tried to follow Uptown Apps's solution. Following is my new code (changed a bit to fit in my other project):</p> <pre><code>- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { return YES; } - (void)textViewDidChange:(UITextView *)textView { CGRect rect = [textView.text boundingRectWithSize:CGSizeMake(300, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: textView.font} context:nil]; _FRAME_SET_H(textView, rect.size.height); _FRAME_SET_H(self, _FRAME_H(textView) + _BLOCK_PADDING * 2); } </code></pre> <p>However, trouble remains. In the following image, the white rect is the UITextView, and the black background is its superview.</p> <p>When I start the app, the UITextView's height is 0, and the screen looks like: <img src="https://i.stack.imgur.com/yGk79.png" alt="enter image description here"></p> <p>Then I type 'A', the screen turns into: <img src="https://i.stack.imgur.com/Xrc5g.png" alt="enter image description here"></p> <p>You see there is two problems: 1) the height is not enough. 2) the caret is strange!</p> <p>Then I type some more 'a', the screen turns into: <img src="https://i.stack.imgur.com/f443b.png" alt="enter image description here"></p> <p>Then I type a 'return' to change a line, the screen turns into: <img src="https://i.stack.imgur.com/JO6eL.png" alt="enter image description here"></p> <p>Yes, it does not change! But I expect it to increase its height to include the new blank line.</p> <p>Then I type a 'A', the screen turns into: <img src="https://i.stack.imgur.com/1Ps5P.png" alt="enter image description here"></p> <p>The height is increased, but the new text is not showing, neither is the caret. I guess it is also due to that the height is not enough.</p> <p>Then I type another 'a', the screen turns into: <img src="https://i.stack.imgur.com/AnChU.png" alt="enter image description here"></p> <p>Letters appear, but only a half...</p> <p>By the way, when I use UILabel, I can get the correct text height using this method!!!! (i.e. calling boundingRectWithSize:)</p>
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