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node_modules/expo-font/ios/FontLoaderModule.swift

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+import ExpoModulesCore
+
+public final class FontLoaderModule: Module {
+  // could be a Set, but to be able to pass to JS we keep it as an array
+  private lazy var registeredFonts: [String] = queryCustomNativeFonts()
+
+  public required init(appContext: AppContext) {
+    super.init(appContext: appContext)
+  }
+
+  public func definition() -> ModuleDefinition {
+    Name("ExpoFontLoader")
+
+    // NOTE: this is exposed in JS as globalThis.expo.modules.ExpoFontLoader.loadedFonts
+    // and potentially consumed outside of Expo (e.g. RN vector icons)
+    // do NOT change the property as it'll break consumers!
+    Function("getLoadedFonts") {
+      return registeredFonts
+    }
+
+    // NOTE: this is exposed in JS as globalThis.expo.modules.ExpoFontLoader.loadAsync
+    // and potentially consumed outside of Expo (e.g. RN vector icons)
+    // do NOT change the function signature as it'll break consumers!
+    AsyncFunction("loadAsync") { (fontFamilyAlias: String, localUri: URL) in
+      let fontUrl = localUri as CFURL
+      // If the font was already registered, unregister it first. Otherwise CTFontManagerRegisterFontsForURL
+      // would fail because of a duplicated font name when the app reloads or someone wants to override a font.
+      if FontFamilyAliasManager.familyName(forAlias: fontFamilyAlias) != nil {
+        guard try unregisterFont(url: fontUrl) else {
+          return
+        }
+      }
+
+      // Register the font
+      try registerFont(fontUrl: fontUrl, fontFamilyAlias: fontFamilyAlias)
+
+      // Create a font object from the given URL
+      let font = try loadFont(fromUrl: fontUrl, alias: fontFamilyAlias)
+
+      if let postScriptName = font.postScriptName as? String {
+        FontFamilyAliasManager.setAlias(fontFamilyAlias, forFont: postScriptName)
+        registeredFonts = Array(Set(registeredFonts).union([postScriptName, fontFamilyAlias]))
+      } else {
+        throw FontNoPostScriptException(fontFamilyAlias)
+      }
+    }
+  }
+}