格式化笔记 iCloud 按钮支持二阶保存到系统文件

Note/FormatNoteViewController.swift

@@ -16,6 +16,7 @@ class FormatNoteViewController: UIViewController {
     private var pasteButton: UIBarButtonItem!
     private var resetButton: UIBarButtonItem!
     private var rightBarButtonMode: RightBarButtonMode = .paste
+    private var isCloudFormatted = false
 
     private enum RightBarButtonMode {
         case paste
@@ -104,6 +105,8 @@ class FormatNoteViewController: UIViewController {
     @objc private func didTapResetButton() {
         textView.text = ""
         rightBarButtonMode = .paste
+        isCloudFormatted = false
+        iCloudButton.setTitle("iCloud 格式化", for: .normal)
         updateRightBarButtonItem()
     }
 
@@ -121,10 +124,16 @@ class FormatNoteViewController: UIViewController {
     }
 
     @objc private func didTapiCloudButton() {
+        if isCloudFormatted {
+            saveToFiles()
+        } else {
             textView.text = formatForCloud(textView.text)
+            isCloudFormatted = true
+            iCloudButton.setTitle("保存到 iCloud", for: .normal)
             rightBarButtonMode = .reset
             updateRightBarButtonItem()
         }
+    }
 
     @objc private func didTapNoteButton() {
         textView.text = formatForNote(textView.text)
@@ -201,6 +210,33 @@ class FormatNoteViewController: UIViewController {
         return content
     }
 
+    private func saveToFiles() {
+        let fileName = generateFileName()
+        let fileURL = FileManager.default.temporaryDirectory.appendingPathComponent(fileName)
+
+        do {
+            try textView.text.write(to: fileURL, atomically: true, encoding: .utf8)
+            let documentPicker = UIDocumentPickerViewController(forExporting: [fileURL], asCopy: true)
+            documentPicker.delegate = self
+            present(documentPicker, animated: true)
+        } catch {
+            print("Failed to write file: \(error)")
+        }
+    }
+
+    private func generateFileName() -> String {
+        let text = textView.text ?? ""
+        let firstLine = text.components(separatedBy: .newlines).first ?? ""
+        let trimmed = firstLine.trimmingCharacters(in: .whitespaces)
+        let withoutHash = trimmed.replacingOccurrences(of: "^#\\s*", with: "", options: .regularExpression)
+        let cleanName = withoutHash.trimmingCharacters(in: .whitespaces)
+
+        if cleanName.isEmpty {
+            return "formatted_note_\(Int(Date().timeIntervalSince1970)).md"
+        }
+        return cleanName + ".md"
+    }
+
     private func removeEmptyLines(_ text: String) -> String {
         let lines = text.components(separatedBy: .newlines)
         let nonEmptyLines = lines.filter { !$0.trimmingCharacters(in: .whitespaces).isEmpty }
@@ -216,6 +252,17 @@ class FormatNoteViewController: UIViewController {
     }
 }
 
+extension FormatNoteViewController: UIDocumentPickerDelegate {
+
+    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
+        // File saved to selected location
+    }
+
+    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
+        // User cancelled
+    }
+}
+
 extension FormatNoteViewController: UITextViewDelegate {
 
     func textViewDidBeginEditing(_ textView: UITextView) {