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node_modules/expo-image/ios/Loaders/SFSymbolLoader.swift

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+// Copyright 2022-present 650 Industries. All rights reserved.
+
+import SDWebImage
+import ExpoModulesCore
+
+class SFSymbolLoader: NSObject, SDImageLoader {
+  // MARK: - SDImageLoader
+
+  func canRequestImage(for url: URL?) -> Bool {
+    return url?.scheme == "sf"
+  }
+
+  func requestImage(
+    with url: URL?,
+    options: SDWebImageOptions = [],
+    context: [SDWebImageContextOption: Any]?,
+    progress progressBlock: SDImageLoaderProgressBlock?,
+    completed completedBlock: SDImageLoaderCompletedBlock? = nil
+  ) -> SDWebImageOperation? {
+    guard let url else {
+      let error = makeNSError(description: "URL provided to SFSymbolLoader is missing")
+      completedBlock?(nil, nil, error, false)
+      return nil
+    }
+
+    // The URI looks like this: sf:/star.fill
+    // pathComponents[0] is `/`, pathComponents[1] is the symbol name
+    guard url.pathComponents.count > 1 else {
+      let error = makeNSError(description: "SF Symbol name is missing from the URL")
+      completedBlock?(nil, nil, error, false)
+      return nil
+    }
+
+    let symbolName = url.pathComponents[1]
+
+    // Use a large fixed point size for high quality, the image view will scale it down.
+    // Note: For weight configuration, use the symbolWeight prop on Image component.
+    // This loader is mainly used for prefetching where weight isn't critical.
+    let configuration = UIImage.SymbolConfiguration(pointSize: 100, weight: .regular)
+
+    guard let image = UIImage(systemName: symbolName, withConfiguration: configuration) else {
+      let error = makeNSError(description: "Unable to create SF Symbol image for '\(symbolName)'")
+      completedBlock?(nil, nil, error, false)
+      return nil
+    }
+
+    // Return as template image so tintColor prop works correctly
+    let templateImage = image.withRenderingMode(.alwaysTemplate)
+    completedBlock?(templateImage, nil, nil, true)
+    return nil
+  }
+
+  func shouldBlockFailedURL(with url: URL, error: Error) -> Bool {
+    // If the symbol doesn't exist, it won't exist on subsequent attempts
+    return true
+  }
+}