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POLine spacing in multi-language layout with Core Text
 

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  1. POLine spacing in multi-language layout with Core Text
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    <p>The attributed string has only one attribute - 17 point Helvetica NeueUI font - covering the whole string. Line 1~3 are purely English, line 4~6 are mixtures of English and Chinese, line 7~8 are purely Chinese.</p> <p>It is then layouted with CTFramesetter and resultant frame is drawn with CTFrameDraw.</p> <pre><code>// UIView subclass - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor whiteColor]; CTFontRef font = CTFontCreateWithName(CFSTR("Helvetica NeueUI"), 17.f, NULL); _text = [[NSAttributedString alloc] initWithString:string attributes: [NSDictionary dictionaryWithObject:(id)font forKey:(id)kCTFontAttributeName]]; CFRelease(font); _framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)_text); CGMutablePathRef path = CGPathCreateMutable(); CGPathAddRect(path, NULL, self.bounds); _frame = CTFramesetterCreateFrame(_framesetter, CFRangeMake(0, 0), path, NULL); CGPathRelease(path); } return self; } - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); // Flip the coordinate system. CGContextTranslateCTM(context, 0.f, self.bounds.size.height); CGContextScaleCTM(context, 1.f, -1.f); CGContextSetTextMatrix(context, CGAffineTransformIdentity); CTFrameDraw(_frame, context); CGContextRestoreGState(context); } </code></pre> <p>The problem is that the space between line 7 and 8 (purely Chinese lines) is much smaller than others.</p> <p>For contrast, I put a <code>UILabel</code> below it, with the same font and text. Ignoring the rendering difference of single characters, you can see the line spaces in <code>UILabel</code> are uniform including the last one between two Chinese lines.</p> <p><img src="https://img.skitch.com/20120226-tjxb4siwht2sa988j5r8h42wbt.png" alt="Screenshot"></p> <p><strong>Notice</strong>: this results above is got on a real device. If you run the same code on the simulator, you'll get very different result for the Core Text view — spaces between lines containing Chinese are much larger than others.</p> <ol> <li>Why is the space between Chinese lines smaller(larger)?</li> <li>How can I layout multi-language text with uniform line height using Core Text?</li> </ol> <p>PS: here is the <a href="http://d.pr/gZgi" rel="nofollow noreferrer">sample project</a> you can try yourself.</p>
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