How to get height for NSAttributedString at a fixed width

Question

I want to do some drawing of NSAttributedStrings in fixed-width boxes, but am having trouble calculating the right height they\'ll take up when drawn. So far, I\'ve tried:

Answer 1

I just wasted a bunch of time on this, so I'm providing an additional answer to save others in the future. Graham's answer is 90% correct, but it's missing one key piece:

To obtain accurate results with -boundingRectWithSize:options: you MUST pass the following options:

NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesDeviceMetrics|NSStringDrawingUsesFontLeading

If you omit the lineFragmentOrigin one, you'll get nonsense back; the returned rect will be a single line high and won't at all respect the size you pass into the method.

Why this is so complicated and so poorly documented is beyond me. But there you have it. Pass those options and it'll work perfectly (on OS X at least).