Did you find any solution for this ? I too want to have different fragments in one paragraph.

Thanks for the reply, I have used a work around for this. After researching about TextKit 2, I found out that some of APIs are not working and some are documented wrong. let paragraphElement = NSTextParagraph(attributedString: attrStr) textLayoutManager.replaceContents(in: element.elementRange, with: paragraphElement) The above method is not working as documented, I found a work around for this problem by using other APIs of the TextKit 2. // creating an NSTextParagraph Element let paragraphElement = NSTextParagraph(attributedString: attrStr) //Getting the corresponding attributed String for the given element let attrString = textContentStorage.attributedString(for: paragraphElement) //replacing the attributed text using below method textContentStorage.textStorage?.replaceCharacters(in: nsrange, with: attrString!)