Sets the glyph at the given index to be one that isn’t shown.
- iOS 7.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
true, the glyph is not shown; if
false, it is shown.
Index of the glyph whose attribute is set.
The typesetter decides which glyphs are not shown and sets this attribute in the layout manager to ensure that those glyphs are not displayed. For example, a tab or newline character doesn’t leave any marks; it just indicates where following glyphs are laid out.
glyph is out of bounds.
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.