KCTKernAttributeName option not working in CTFrameGetLines

KCTKernAttributeName option not working in CTFrameGetLines

I am trying to get a multiline of text from an NSMutableAttributedString via CTFrameGetLines.

All other options are applied, but kCTKernAttributeName option is not reflected in CTFrameGetLines.

Even if I put the value of kCTKernAttributeName in NSMutableAttributedString, it behaves as if there is no kCTKernAttributeName value.

Is there any solution or cause?
KCTKernAttributeName option not working in CTFrameGetLines
 
 
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