Returns the value of the attribute identified by the given attribute tag for the glyph at the given index.
- macOS 10.0–10.11Deprecated
The attribute whose value is returned.
Index of the glyph whose attribute value is returned.
The value of the attribute identified by
Subclasses that define their own custom attributes must override this method to access their own storage for the attribute values. Nonnegative tags are reserved by Apple; you can define your own attributes with negative tags and set values using
If noncontiguous layout is not enabled, this method causes generation of all glyphs up to and including
glyph. This method is primarily for the use of the glyph generator and typesetter.