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    <p>simple. set up a test string and frame and compare origin of two lines of the font you want. Then if you want to calculate leading just use line height accent descent to do the calculation.</p> <pre><code> - (float)getLineHeight { CFMutableAttributedStringRef testAttrString; testAttrString = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0); NSString *testString = @"testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest"; CFAttributedStringReplaceString (testAttrString, CFRangeMake(0, 0), (CFStringRef)testString); CTFontRef myFont1 = CTFontCreateWithName((CFStringRef)@"Helvetica", 30, NULL); CFRange range = CFRangeMake(0,testString.length); CFAttributedStringSetAttribute(testAttrString, range, kCTFontAttributeName, myFont1); CGMutablePathRef path = CGPathCreateMutable(); CGRect bounds; if ([model isLandscape]) { bounds = CGRectMake(0, 10, 1024-20, 768); } else { bounds = CGRectMake(0, 10, 768-20, 1024); } CGPathAddRect(path, NULL, bounds); CTFramesetterRef testFramesetter = CTFramesetterCreateWithAttributedString(testAttrString); CTFrameRef testFrameRef = CTFramesetterCreateFrame(testFramesetter,CFRangeMake(0, 0), path, NULL); CGPoint origins1,origins2; CTFrameGetLineOrigins(testFrameRef, CFRangeMake(0, 1), &amp;origins1); CTFrameGetLineOrigins(testFrameRef, CFRangeMake(1, 1), &amp;origins2); return origins1.y-origins2.y; } </code></pre>
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    1. POHow does line spacing work in Core Text? (and why is it different from NSLayoutManager?)
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    1. COCool, this works! I changed it some as I was subclassing UITextView and already had a preexisting CTFrameRef which made things a bit easier but this is a great way of always getting an accurate calculation of the line height for any font at any point size with any scale (for those who need to account for a view's scale just add a `CGFloat scale` parameter and change the return line to: `return (origins1.y - origins2.y) * scale;`. Many thanks, user1307179!
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