Returns the range for the glyphs around the given glyph that can be displayed using only their advancements from the font, without pairwise kerning or other adjustments to spacing.
- iOS 7.0+
- macOS 10.0+
- tvOS 9.0+
Index of the glyph to test.
The range of nominally spaced glyphs.
The range returned begins with the first glyph, counting back from
glyph, that has a location set, and it continues up to, but does not include, the next glyph that has a location set.
Performs glyph generation and layout if needed.