支持外部 Markdown 文件预览与格式化分发

Note/SceneDelegate.swift

@@ -20,6 +20,10 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         let navigationController = UINavigationController(rootViewController: rootViewController)
         window?.rootViewController = navigationController
         window?.makeKeyAndVisible()
+
+        if let url = connectionOptions.urlContexts.first?.url {
+            handleSharedFile(url)
+        }
     }
 
     func sceneDidDisconnect(_ scene: UIScene) {
@@ -50,6 +54,38 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         // to restore the scene back to its current state.
     }
 
+    func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
+        guard let url = URLContexts.first?.url else { return }
+        handleSharedFile(url)
+    }
+
+    private func handleSharedFile(_ url: URL) {
+        guard url.isFileURL,
+              let navigationController = window?.rootViewController as? UINavigationController else {
+            return
+        }
+
+        let shouldStopAccessing = url.startAccessingSecurityScopedResource()
+        defer {
+            if shouldStopAccessing {
+                url.stopAccessingSecurityScopedResource()
+            }
+        }
+
+        do {
+            let content = try String(contentsOf: url, encoding: .utf8)
+            DispatchQueue.main.async {
+                let viewController = PreviewViewController()
+                viewController.initialText = content
+                viewController.fileName = url.lastPathComponent
+                viewController.title = url.lastPathComponent
+                navigationController.pushViewController(viewController, animated: true)
+            }
+        } catch {
+            print("Failed to read shared file: \(error)")
+        }
+    }
+
 
 }