How can I get the bounding box for each ruby annotation character (or furigana) in a CTFrame text rendered by CoreText and CoreGraphics in iOS? (iOS 11, 12 or 13)
I made a swift version program that encloses each character in a red box but I wasn't able to get the bounding boxes for the ruby annotation characters, *aka furigana*. I painted in green the ruby character boxes for the purpose of this question. (Please see the image in the GitHub link)
How can I achieve that? Any Ideas?
Edit: For clarity, the green boxes were painted by hand in an illustration software. I need to draw the green boxes by code.
The full source is in GitHub https://github.com/huse360/LetterFrame
This is the main source code:
override func draw(_ rect: CGRect) {
				guard let context = UIGraphicsGetCurrentContext() else { return }
			
				
			 context.textMatrix = .identity
			 context.translateBy(x: 0, y: self.bounds.size.height)
			 context.scaleBy(x: 1.0, y: -1.0)
			
				
			 let string = "｜優勝《ゆうしょう》の｜懸《か》かった｜試合《しあい》。｜Test《テスト》.\nThe quick brown fox jumps over the lazy dog. 12354567890 @#-+"
	
				
			 let attributedString = Utility.sharedInstance.furigana(String: string)
			
			 let range = attributedString.mutableString.range(of: attributedString.string)
			 attributedString.addAttribute(.font, value: font, range: range)
			
			 let framesetter = attributedString.framesetter()
			
			 let textBounds = self.bounds.insetBy(dx: 20, dy: 20)
			 let frame = framesetter.createFrame(textBounds)
				
//Draw the frame text:
			
			 frame.draw(in: context)
							
			 let origins = frame.lineOrigins()
			
			 let lines = frame.lines()
				context.setStrokeColor(UIColor.red.cgColor)
				context.setLineWidth(0.7)
				for i in 0 ..< origins.count {
						let line = lines[i]
						
						for run in line.glyphRuns() {
								
								let font = run.font
								let glyphPositions = run.glyphPositions()
								let glyphs = run.glyphs()
								
								let glyphsBoundingRects =	font.boundingRects(of: glyphs)
								
//DRAW the bounding box for each glyph:
								
								for k in 0 ..< glyphPositions.count {
										let point = glyphPositions[k]
										let gRect = glyphsBoundingRects [k]
								
										var box = gRect
										box.origin +=	point + origins[i] + textBounds.origin
										context.stroke(box)
														
								}// for k
						
						}//for run
						
			 }//for i
				
		}//func draw
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