# substituteGlyphs(in:withGlyphs:) Replaces the specified glyphs with specified replacement glyphs. ``` func substituteGlyphs(in glyphRange: NSRange, withGlyphs glyphs: UnsafeMutablePointer!) ``` ## Parameters `glyphRange` The range of glyphs to be substituted. `glyphs` The glyphs to substitute for the glyphs in `glyphRange`. ## Discussion This method does not alter the glyph-to-character mapping or invalidate layout information. A subclass can override this method to interact with custom glyph storage. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)