Sets the bounds and container for the extra line fragment.
- iOS 7.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
The rectangle to set.
Indicates where the insertion point is drawn.
The text container where the rectangle is to be laid out.
The extra line fragment is used when the text backing ends with a hard line break or when the text backing is totally empty, to define the extra line which needs to be displayed at the end of the text. If the text backing is not empty and does not end with a hard line break, this should be set to
Line fragment rectangles and line fragment used rectangles are always in container coordinates.
This method is used by the layout mechanism and should be invoked only during typesetting, in almost all cases only by the typesetter. For example, a custom typesetter might invoke it.