update

lib/util/fileUtils.dart

@@ -107,13 +107,23 @@ deleteDirectory(String path) async {
 
 
 
-Future<String?> getSaveLocation({String? suggestedName}) async {
+Future<String?> getSaveLocation({required String suggestedName, String? iOSAppDirectory}) async {
   if (Platform.isIOS) {
-    final directory = await getApplicationDocumentsDirectory();
-
-    Log.d('iOS get file path: ${directory.path}/$suggestedName');
-
-    return '${directory.path}/$suggestedName';
+    final docDir = await getApplicationDocumentsDirectory();
+    String path = docDir.path;
+    if (iOSAppDirectory != null) {
+      path = '${docDir.path}/$iOSAppDirectory';
+    }
+    Directory dir = Directory(path);
+    // 检查文件夹是否已经存在
+    bool exists = await dir.exists();
+    if (!exists) {
+      // 如果文件夹不存在，则创建它
+      await dir.create(recursive: true); // 设置 recursive 为 true 可以创建多级目录
+    }
+    final finalPath = File('${dir.path}/$suggestedName').path;
+    // Log.d('iOS get file path: $finalPath');
+    return finalPath;
 
   } else {
     final file_selector.FileSaveLocation? selectedFile = await file_selector.getSaveLocation(