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    <p>CTFramesetterSuggestFrameSizeWithConstraints works correctly. The reason that you get a height that is too short is because of the leading in the default paragraph style attached to attributed strings. If you don't attach a paragraph style to the string then CoreText returns the height needed to render the text, but with no space between the lines. This took me forever to figure out. Nothing in the documentation spells it out. I just happened to notice that my heights were short by an amount equal to (number of lines x expected leading). To get the height result you expect you can use code like the following:</p> <pre><code>NSString *text = @"This\nis\nsome\nmulti-line\nsample\ntext." UIFont *uiFont = [UIFont fontWithName:@"Helvetica" size:17.0]; CTFontRef ctFont = CTFontCreateWithName((CFStringRef) uiFont.fontName, uiFont.pointSize, NULL); // When you create an attributed string the default paragraph style has a leading // of 0.0. Create a paragraph style that will set the line adjustment equal to // the leading value of the font. CGFloat leading = uiFont.lineHeight - uiFont.ascender + uiFont.descender; CTParagraphStyleSetting paragraphSettings[1] = { kCTParagraphStyleSpecifierLineSpacingAdjustment, sizeof (CGFloat), &amp;leading }; CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(paragraphSettings, 1); CFRange textRange = CFRangeMake(0, text.length); // Create an empty mutable string big enough to hold our test CFMutableAttributedStringRef string = CFAttributedStringCreateMutable(kCFAllocatorDefault, text.length); // Inject our text into it CFAttributedStringReplaceString(string, CFRangeMake(0, 0), (CFStringRef) text); // Apply our font and line spacing attributes over the span CFAttributedStringSetAttribute(string, textRange, kCTFontAttributeName, ctFont); CFAttributedStringSetAttribute(string, textRange, kCTParagraphStyleAttributeName, paragraphStyle); CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(string); CFRange fitRange; CGSize frameSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, textRange, NULL, bounds, &amp;fitRange); CFRelease(framesetter); CFRelease(string); </code></pre>
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    1. POCTFramesetterSuggestFrameSizeWithConstraints sometimes returns incorrect size?
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    1. USChris DeSalvo
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    1. COso how is this done when you have multiple fonts in the attributed string?
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      1. USbogardon
    2. COYou can add the paragraph attribute to the string by using ``CFAttributedStringSetAttributes`` and pass NO for `clearOtherAttributes`
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      1. USgaige
    3. COI was looking for this one thank you so much Chris!
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      1. USstefanosn
 

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