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copied!<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), &origins1); CTFrameGetLineOrigins(testFrameRef, CFRangeMake(1, 1), &origins2); return origins1.y-origins2.y; } </code></pre>

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