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POString length with given font to fit UITextView
 

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    <p>I need to move text that the user has entered into a large multi-line <code>UITextView</code> into a smaller (but still multi-line) <code>UITextView</code>*. If the user has entered more text than will display in the smaller view, I want to truncate the text so that it fits with all the (truncated) text visible. (Neither the large <code>UITextView</code> nor the smaller one should scroll.)</p> <p>What's the best way to do this?</p> <p>I can use a loop, shortening the string by a character each time, and then use <code>NSString</code>'s <code>sizeWithFont: constrainedToSize: lineBreakMode:</code> to find out the height this shorter string would need, and then compare that against the height I have available in my smaller <code>UITextView</code>, ending the loop when the string will fit - but that seems slow and awkward. There must be a better way.</p> <p>I'd like to just tell the destination <code>UITextView</code> to truncate its displayText member as it displays it on screen, but I've not been able to find a way to do that. </p> <p>*More context on this, from a comment I made below: </p> <p>I've got a landscape app. I change the layout of the view depending on the photo the user chooses. If it's a landscape photo, the caption is smaller - just a line at the bottom of the photo. If she chooses a portrait photo, then there's plenty of space I can use for the caption at the side of the photo, so the caption is bigger.</p> <p>If the user changes her photo orientation from portrait to landscape, then I want to truncate the text and then allow her to edit it so that it makes sense. I could just zap it, but I'd prefer to preserve it to minimize her typing.</p>
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