Xcode – Using fonts from xcfamework

You need to register the fonts with the font manager. I did this extending UIFont

extension UIFont {
    private class ModuleClass {}
    static func fontsURLs() -> [URL] {
        let bundle = Bundle(for: ModuleClass.self)
        let fileNames = ["Feather"]

        return fileNames.compactMap { fontName in
            bundle.url(forResource: fontName, withExtension: "ttf")
        }
    }
    
    /// Registers the specified graphics font with the font manager.
    /// - Parameter url: Bundle URL of the font to register
    /// - Throws: If font cannot be registered
    static func register(from url: URL) throws {
        guard let fontDataProvider = CGDataProvider(url: url as CFURL) else {
            throw FontError.dataProviderNotCreated(message: "Could not create font data provider for (url).")
        }
        
        guard let font = CGFont(fontDataProvider) else {
            throw FontError.fontNotCreated(message: "Could not create font data provider for (url).")
        }
        
        var error: Unmanaged<CFError>?
        guard CTFontManagerRegisterGraphicsFont(font, &error) else {
            throw error?.takeUnretainedValue() ?? FontError.fontNotRegistered
        }
    }
}

Then, you need use this.

public extension UIFont {
/// Registers the specified graphics font with the font manager.
    /// Registered fonts participate in font descriptor matching.
    static func registerFonts() {
        let urls = fontsURLs()
        for url in urls {
            do {
                try register(from: url)
            } catch {
                debugPrint(error)
            }
        }
    }
}

and in your main project (app) register the fonts

// In AppDelegate.swift
import YourModule

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    UIFont.registerFonts()
    return true
}