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PODiscrepancy between sizeWithFont:constrainedToSize:lineBreakMode: and textView.contentSize.height
 

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  1. PODiscrepancy between sizeWithFont:constrainedToSize:lineBreakMode: and textView.contentSize.height
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    <p>I am using the method <code>[string sizeWithFont:constrainedToSize:lineBreakMode:]</code> to estimate the height of a <code>textView</code> that I am resizing. However, it seems to consistently return the incorrect size. To debug, I wrote the following code:</p> <pre><code>self.textView.font = [UIFont systemFontOfSize:14.0]; // It was this before, anyways NSLog(@"Real width: %lf %lf", self.textView.contentSize.width, self.textView.frame.size.width); NSLog(@"Real height: %lf", self.textView.contentSize.height); NSLog(@"Estimated width: %lf", kOTMessageCellTextWidth); NSLog(@"Estimated height: %lf", ([message.message sizeWithFont:[UIFont systemFontOfSize:14.0] constrainedToSize:CGSizeMake(kOTMessageCellTextWidth, CGFLOAT_MAX) lineBreakMode:UILineBreakModeWordWrap].height)); </code></pre> <p>However, the above code reveals that I am getting inconsistent results:</p> <blockquote> <p>Real width: 223.000000 223.000000<br /> Real height: 52.000000<br /> Estimated width: 223.000000<br /> Estimated height: 36.000000<br /> Real width: 223.000000 223.000000<br /> Real height: 142.000000<br /> Estimated width: 223.000000<br /> Estimated height: 126.000000<br /> Real width: 223.000000 223.000000<br /> Real height: 142.000000<br /> Estimated width: 223.000000<br /> Estimated height: 126.000000<br /></p> </blockquote> <p>I noticed in <a href="https://stackoverflow.com/questions/3141399/calculate-the-height-of-a-uitextviews-text-with-sizewithfontconstrainedtosizel">this similar question</a> that (apparently) <code>textView</code> has some padding that constrains its actual width. The recommendation there was the decrease the width passed to <code>sizeWithFont:</code> by some number. The recommended number was 11.</p> <p>My question: is there any way to actually retrieve this value programmatically, or is there some documentation that I missed specifying this number? It seems like this number should be available and shouldn't have to be guess-and-checked, but I can't find a reliable way to identify it.</p> <p>Thanks in advance.</p>
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    1. COIf it's any help to people, the "magic numbers" for me were to subtract `16.0f` from the width I'm constraining to (note that despite being a float, this number is rounded to the nearest pixel; don't bother trying decimals), and to add `16` to the height I am returned by `sizeWithFont:`.
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