gistfile1.m

for (id p in self.lines)
	{
		//if (i >= self.numberOfLines && self.numberOfLines)
		//	break;
		
		CGPoint origin = self.lineOrigins[i++];
		CGContextSetTextPosition(ctx, origin.x , origin.y);
		CTLineRef line = (CTLineRef)p;
        
        CGFloat ascent, descent, leading;
		CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
		NSArray *runs = (NSArray*)CTLineGetGlyphRuns(line);
		
		for (id r in runs)
		{
			CGContextSaveGState(ctx);
			
			CTRunRef run = (CTRunRef)r;
			NSDictionary *attributes = (id)CTRunGetAttributes(run);
			CGSize shadowOffset = [[attributes valueForKey:kRAShadowOffsetName] CGSizeValue];
			CGColorRef shadowColor = (CGColorRef)[attributes valueForKey:kRAShadowColorName];
			CGContextSetShadowWithColor(ctx, shadowOffset, 0, shadowColor);
			NSInteger superscript = [[attributes valueForKey:(id)kCTSuperscriptAttributeName] integerValue];
			CGContextSaveGState(ctx);
			if (superscript != 0)
			{
				if (superscript > 0)
					CGContextConcatCTM(ctx, CGAffineTransformMakeTranslation(0, ascent * .4f));
				else
					CGContextConcatCTM(ctx, CGAffineTransformMakeTranslation(0, ascent * -.16f));
			}
			CTRunDraw(run, ctx, CFRangeMake(0, 0));
			CGContextRestoreGState(ctx);
			CGFloat width = CTRunGetTypographicBounds(run, CFRangeMake(0, 0), NULL, NULL, NULL);
			
			NSUInteger underlineStyle = [[attributes valueForKey:(id)kCTUnderlineStyleAttributeName] unsignedIntegerValue];
			if (underlineStyle)
			{
				NSUInteger underlineHeight = MAX(floor(descent / 4.0f), 1);
				
				CGFloat underlineY = floor(origin.y - underlineHeight * 3);
				underlineY += (underlineHeight % 2) > 0.0f ? .5f : 0;
				
				if (underlineStyle & kCTUnderlineStyleThick)
					underlineHeight *= 2.0f;
				
				UIBezierPath *path = [UIBezierPath bezierPath];
				if (underlineStyle & 0x8) //Double
				{
					underlineY += underlineHeight;
					[path moveToPoint:CGPointMake(origin.x, underlineY)];
					[path addLineToPoint:CGPointMake(ceil(origin.x + width), underlineY)];
					[path closePath];
					[path moveToPoint:CGPointMake(origin.x, underlineY - underlineHeight * 2)];
					[path addLineToPoint:CGPointMake(ceil(origin.x + width), underlineY - underlineHeight * 2)];
					[path closePath];
				}
				else
				{
					[path moveToPoint:CGPointMake(origin.x, underlineY)];
					[path addLineToPoint:CGPointMake(ceil(origin.x + width), underlineY)];	
				}
				
				CGContextSetStrokeColorWithColor(ctx, (CGColorRef)[attributes valueForKey:(id)kCTUnderlineColorAttributeName]);
				CGContextSetLineWidth(ctx, underlineHeight);
				CGContextAddPath(ctx, [path CGPath]);
				
				CGFloat width = ascent;
				if ((underlineStyle & ~0xFF) == kCTUnderlinePatternDash)
					CGContextSetLineDash(ctx, origin.x, (CGFloat[]){width,width/2}, 2);
				else if ((underlineStyle & ~0xFF) == kCTUnderlinePatternDot)
					CGContextSetLineDash(ctx, origin.x, (CGFloat[]){width/4,width/4}, 2);
				else if ((underlineStyle & ~0xFF) == kCTUnderlinePatternDashDot)
					CGContextSetLineDash(ctx, origin.x, (CGFloat[]){width,width/4,width/4,width/4}, 4);	
				else if ((underlineStyle & ~0xFF) == kCTUnderlinePatternDashDotDot)
					CGContextSetLineDash(ctx, origin.x, (CGFloat[]){width,width/4,width/4,width/4,width/4,width/4}, 6);
				CGContextStrokePath(ctx);
			}
			origin.x += width;
			origin.x = ceil(origin.x);
			CGContextRestoreGState(ctx);
		}
	}