iOS 8 sizeThatFits for UITextView text not returning correct height (AutoLayout)

autolayout, ios, nslayoutconstraint, objective-c, uitextview

Solution

As always with AutoLayout, you have to do:

[_textInfoView layoutIfNeeded];

(don't even need the `setNeedsDisplay` at all).

So, fully working:

_textView.text = [_collectionDescription lowercaseString];
_textView.font = [UIFont fontLight:22];
_textView.textColor = [UIColor whiteColor];
_textView.textAlignment = NSTextAlignmentCenter;
_constraintTextViewHeight.constant = ceilf([_textView sizeThatFits:CGSizeMake(_textView.frame.size.width, FLT_MAX)].height);

[_textView layoutIfNeeded];
[_textView updateConstraints];

Problem

I'm trying to vertically center a UITextView using the appropriate height retrieved from `sizeThatFits`. There are a plethora of other answers that suggest this is the most appropriate way of calculating this. (Note that I've tried it both with plain and attributed strings, and both exert the same behavior). No matter what I try (even using attributed strings and setting the font size or line height to something bigger or smaller) it always only shows a certain truncated number of characters of text (in this case, 3 lines, and it's always exactly the same). What am I missing? ``` _textView.text = [_collectionDescription lowercaseString]; _textView.font = [UIFont fontLight:22]; _textView.textColor = [UIColor whiteColor]; _textView.textAlignment = NSTextAlignmentCenter; _constraintTextViewHeight.constant = ceilf([_textView sizeThatFits:CGSizeMake(_textView.frame.size.width, FLT_MAX)].height); [_textView setNeedsDisplay]; [_textView updateConstraints]; ```

Original source