# setBidiLevels(_:forGlyphRange:) Sets the direction of the specified glyphs for bidirectional text. ``` func setBidiLevels(_ levels: UnsafePointer!, forGlyphRange glyphRange: NSRange) ``` ## Parameters `levels` Values in `levels` can range from 0 to 61 as defined by Unicode Standard Annex #9. `glyphRange` The range of glyphs for which the bidirectional text levels are desired. ## Discussion 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)