diff --git a/lib/models/refresh.dart b/lib/models/refresh.dart
deleted file mode 100644
index ca52587..0000000
--- a/lib/models/refresh.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-/// 刷新令牌
-class Refresh {
-  String token;
-  DateTime expire;
-
-  Refresh({
-    required this.token,
-    required this.expire,
-  });
-
-  factory Refresh.fromJson(Map<String, dynamic> json) => Refresh(
-    token: json['token'] as String,
-    expire: DateTime.parse(json['expire'] as String),
-  );
-
-  Map<String, dynamic> toJson() => {
-    'token': token,
-    'expire': expire.toIso8601String(),
-  };
-}
\ No newline at end of file
diff --git a/lib/provider/follow_provider.dart b/lib/provider/follow_provider.dart
index 4d6eb2c..2c46104 100644
--- a/lib/provider/follow_provider.dart
+++ b/lib/provider/follow_provider.dart
@@ -1,12 +1,12 @@
 import 'package:flutter/material.dart';
 import 'package:komikku/dex/apis/manga_api.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 
 class FollowProvider extends ChangeNotifier {
   /// 订阅漫画
   Future<void> followManga(String id) async {
     // 未登录，直接返回
-    if (!await userLoginState()) return;
+    if (!await Auth.userLoginState) return;
     await MangaApi.followMangaAsync(id);
 
     notifyListeners();
@@ -15,7 +15,7 @@ class FollowProvider extends ChangeNotifier {
   /// 退订漫画
   Future<void> unfollowManga(String id) async {
     // 未登录，直接返回
-    if (!await userLoginState()) return;
+    if (!await Auth.userLoginState) return;
     await MangaApi.unfollowMangaAsync(id);
 
     notifyListeners();
diff --git a/lib/provider/user_provider.dart b/lib/provider/user_provider.dart
index 39b7761..9b40553 100644
--- a/lib/provider/user_provider.dart
+++ b/lib/provider/user_provider.dart
@@ -1,7 +1,7 @@
 import 'package:flutter/cupertino.dart';
 import 'package:komikku/dex/apis/auth_api.dart';
 import 'package:komikku/dex/models/login.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 
 class UserProvider extends ChangeNotifier {
   /// 登录
@@ -11,16 +11,16 @@ class UserProvider extends ChangeNotifier {
         : Login(username: emailOrUsername, password: password);
 
     var response = await AuthApi.loginAsync(login);
-    await setRefresh(response.token.refresh);
-    await setSession(response.token.session);
+    await Auth.setRefresh(response.token.refresh);
+    await Auth.setSession(response.token.session);
 
     notifyListeners();
   }
 
   /// 登出
   Future<void> logout() async {
-    await removeSession();
-    await removeRefresh();
+    await Auth.removeSession();
+    await Auth.removeRefresh();
     await AuthApi.logoutAsync();
 
     notifyListeners();
diff --git a/lib/utils/auth.dart b/lib/utils/auth.dart
new file mode 100644
index 0000000..e6e693c
--- /dev/null
+++ b/lib/utils/auth.dart
@@ -0,0 +1,73 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class Auth {
+  /// 用户状态
+  static Future<bool> get userLoginState async {
+    return await session != null || await refresh != null;
+  }
+
+  /// 获取会话令牌
+  static Future<String?> get session async {
+    final prefs = await SharedPreferences.getInstance();
+    final list = prefs.getStringList('session');
+    if (list == null) return null;
+
+    if (DateTime.now().isAfter(DateTime.parse(list[0]))) {
+      await prefs.remove('session');
+      return null;
+    }
+
+    return list[1];
+  }
+
+  /// 设置会话令牌
+  static Future<bool> setSession(String token) async {
+    final prefs = await SharedPreferences.getInstance();
+
+    var expire = DateTime.now().add(const Duration(minutes: 14)).toIso8601String();
+    return await prefs.setStringList('session', [expire, token]);
+  }
+
+  /// 移除会话令牌
+  static Future<void> removeSession() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.remove('session');
+  }
+
+  /// 获取刷新令牌
+  static Future<String?> get refresh async {
+    var file = await _file;
+    if (!await file.exists()) return null;
+
+    var refreshMap = json.decode(await file.readAsString());
+    // 过期返回null
+    if (DateTime.now().isAfter(DateTime.parse(refreshMap['expire']))) {
+      return null;
+    }
+
+    return refreshMap['token'];
+  }
+
+  /// 设置刷新令牌
+  static Future<void> setRefresh(String token) async {
+    var file = await _file;
+    var expire = DateTime.now().add(const Duration(days: 29)).toIso8601String();
+    await file.writeAsString(json.encode({'token': token, 'expire': expire}));
+  }
+
+  /// 移除会话令牌
+  static Future<void> removeRefresh() async {
+    var file = await _file;
+    if (await file.exists()) await file.delete();
+  }
+
+  /// 获取 .token 文件
+  static Future<File> get _file async {
+    final directory = await getApplicationDocumentsDirectory();
+    return File('${directory.path}/.token');
+  }
+}
diff --git a/lib/utils/http.dart b/lib/utils/http.dart
index f0cedaa..2a4e1c6 100644
--- a/lib/utils/http.dart
+++ b/lib/utils/http.dart
@@ -2,7 +2,7 @@ import 'package:dio/dio.dart';
 import 'package:komikku/dex/apis/auth_api.dart';
 import 'package:komikku/dex/settings.dart';
 import 'package:komikku/dex/models/refresh_token.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 
 class HttpUtil {
   static final HttpUtil _instance = HttpUtil._internal();
@@ -93,14 +93,14 @@ class HttpUtil {
     Options options = Options();
 
     // 查看是否登录
-    if (await userLoginState()) {
-      var token = await getSession();
+    if (await Auth.userLoginState) {
+      var token = await Auth.session;
 
       // session 为空的情况，请求刷新session
       if (token == null) {
-        var response = await AuthApi.refreshAsync(RefreshToken(token: (await getRefresh())!));
+        var response = await AuthApi.refreshAsync(RefreshToken(token: (await Auth.refresh)!));
         token = response.token.session;
-        await setSession(token);
+        await Auth.setSession(token);
       }
 
       options = Options(headers: {
diff --git a/lib/utils/local_setting.dart b/lib/utils/local_setting.dart
new file mode 100644
index 0000000..c9dd41a
--- /dev/null
+++ b/lib/utils/local_setting.dart
@@ -0,0 +1,71 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+
+/// 本地设置
+class LocalSetting {
+  /// 查询 .setting 文件
+  static Future<Map<String, dynamic>> all() async {
+    var file = await _file;
+    return json.decode(await file.readAsString());
+  }
+
+  /// 往 .setting 文件中插入数据
+  static Future<void> insert(Map<String, dynamic> map) async {
+    var file = await _file;
+    var oldMap = await json.decode(await file.readAsString()) as Map<String, dynamic>;
+
+    for (var key in map.keys) {
+      if (oldMap.containsKey(key)) {
+        oldMap[key] = map[key];
+      } else {
+        oldMap.addAll({key: map[key]});
+      }
+    }
+
+    file.writeAsString(json.encode(oldMap));
+  }
+
+  /// 从 .setting 文件中删除数据
+  static Future<void> delete(key) async {
+    var file = await _file;
+    var oldMap = await json.decode(await file.readAsString()) as Map<String, dynamic>;
+
+    if (oldMap.containsKey(key)) {
+      oldMap.remove(key);
+    }
+
+    file.writeAsString(json.encode(oldMap));
+  }
+
+  /// 获取 .setting 文件
+  static Future<File> get _file async {
+    final directory = await getApplicationDocumentsDirectory();
+    var file = File('${directory.path}/.setting');
+    // 不存在则使用默认项新建
+    if (!await file.exists()) file.writeAsString(json.encode(_default));
+
+    return file;
+  }
+
+  /// 默认 .user 文件
+  static const _default = {
+    // 内容分级
+    'content_rating': ['safe', 'suggestive', 'erotica', 'pornographic'],
+    // 章节可用翻译语言
+    'translated_language': ['zh', 'zh-hk'],
+    // 阅读图片是否压缩
+    'data_saver': false,
+  };
+}
+
+/// 获取内容分级
+Future<List<String>> getContentRating() async {
+  var all = await LocalSetting.all();
+  return all['content_rating'];
+}
+
+/// 设置内容分级
+Future<void> setContentRating(List<String> contentRating) async =>
+    await LocalSetting.insert({'content_rating': contentRating});
diff --git a/lib/utils/user.dart b/lib/utils/user.dart
deleted file mode 100644
index 8d648fa..0000000
--- a/lib/utils/user.dart
+++ /dev/null
@@ -1,95 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:komikku/models/refresh.dart';
-import 'package:path_provider/path_provider.dart';
-import 'package:shared_preferences/shared_preferences.dart';
-
-/// 刷新令牌过期时间
-const _refreshExpire = Duration(days: 29);
-
-/// 会话令牌过期时间
-const _sessionExpire = Duration(minutes: 14);
-
-/// 用户状态
-Future<bool> userLoginState() async {
-  return await getSession() != null || await getRefresh() != null;
-}
-
-/// 获取会话令牌
-Future<String?> getSession() async {
-  final prefs = await SharedPreferences.getInstance();
-  final list = prefs.getStringList('session');
-  if (list == null) return null;
-
-  if (DateTime.now().isAfter(DateTime.parse(list[0]))) {
-    await prefs.remove('session');
-    return null;
-  }
-
-  return list[1];
-}
-
-/// 获取刷新令牌
-Future<String?> getRefresh() async {
-  var file = await _localFile;
-  // 不存在时返回 null
-  if (!await file.exists()) return null;
-
-  var jsonString = await file.readAsString();
-  if (jsonString.isEmpty) return null;
-
-  var refreshMap = jsonDecode(jsonString);
-  // 过期返回null
-  if (DateTime.now().isAfter(DateTime.parse(refreshMap['expire']))) {
-    return null;
-  }
-
-  return refreshMap['token'];
-}
-
-/// 设置会话令牌
-Future<bool> setSession(String token) async {
-  final prefs = await SharedPreferences.getInstance();
-  var result = await prefs.setStringList('session', [
-    DateTime.now().add(_sessionExpire).toIso8601String(),
-    token,
-  ]);
-
-  return result;
-}
-
-/// 设置刷新令牌
-Future<void> setRefresh(String token) async {
-  var file = await _localFile;
-  var jsonString = jsonEncode(Refresh(
-    token: token,
-    expire: DateTime.now().add(_refreshExpire),
-  ));
-
-  file.writeAsString(jsonString);
-}
-
-/// 移除会话令牌
-Future<void> removeSession() async {
-  final prefs = await SharedPreferences.getInstance();
-  await prefs.remove('session');
-}
-
-/// 移除会话令牌
-Future<void> removeRefresh() async {
-  var file = await _localFile;
-  if (await file.exists()) file.delete();
-}
-
-/// 本地文件
-Future<File> get _localFile async {
-  final path = await _localPath;
-  return File('$path/refresh_token');
-}
-
-/// 应用目录
-Future<String> get _localPath async {
-  final directory = await getApplicationDocumentsDirectory();
-  return directory.path;
-}
diff --git a/lib/views/details.dart b/lib/views/details.dart
index 8143423..22f3877 100644
--- a/lib/views/details.dart
+++ b/lib/views/details.dart
@@ -3,12 +3,13 @@ import 'package:flutter/material.dart';
 import 'package:komikku/dex/apis.dart';
 import 'package:komikku/dex/apis/follows_api.dart';
 import 'package:komikku/dex/models.dart';
+import 'package:komikku/dex/models/chapter_list.dart';
 import 'package:komikku/dex/models/query/manga_feed_query.dart';
 import 'package:komikku/dto/chapter_dto.dart';
 import 'package:komikku/dto/manga_dto.dart';
 import 'package:komikku/provider/follow_provider.dart';
 import 'package:komikku/utils/timeago.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 import 'package:komikku/views/reading.dart';
 import 'package:komikku/widgets/bottom_modal_item.dart';
 import 'package:komikku/widgets/builder_checker.dart';
@@ -27,12 +28,13 @@ class Details extends StatefulWidget {
 }
 
 class _DetailsState extends State<Details> {
-  final _followIconValueNotifier = ValueNotifier<bool>(false);
-  final _chapterListValueNotifier = ValueNotifier<bool>(false);
-  var _orderMode = OrderMode.desc;
-  late final Future<List<ChapterDto>> _chapterListFuture = _getMangaFeed();
+  final _followIconValueNotifier = ValueNotifier(false);
+  final _orderValueNotifier = ValueNotifier(OrderMode.desc);
 
-  // 是否正在执行关键任务
+  /// 因为需要排序，所以将响应内容缓存
+  Future<ChapterListResponse>? _getMangaFeedFuture;
+
+  /// 是否正在执行关键任务
   bool _isBusy = false;
 
   @override
@@ -40,7 +42,7 @@ class _DetailsState extends State<Details> {
     var followProvider = Provider.of<FollowProvider>(context, listen: false);
 
     return DelayPop(
-      flag: _isBusy,
+      flag: () => _isBusy,
       duration: const Duration(seconds: 1),
       child: Scaffold(
         extendBodyBehindAppBar: true,
@@ -101,19 +103,19 @@ class _DetailsState extends State<Details> {
           ),
           onPressed: () async {
             // 未登录
-            if (!await userLoginState()) {
+            if (!await Auth.userLoginState) {
               showText(text: '请先登录');
               return;
             }
 
             // 已登录
-            _isBusy = true;
             if (_followIconValueNotifier.value) {
               // 取消订阅确认
               showAlertDialog(
                 title: '是否取消订阅',
                 cancelText: '再想想',
                 onConfirm: () async {
+                  _isBusy = true;
                   showText(text: '已取消订阅');
                   _followIconValueNotifier.value = !_followIconValueNotifier.value;
                   await followProvider.unfollowManga(widget.dto.id);
@@ -122,6 +124,7 @@ class _DetailsState extends State<Details> {
               );
             } else {
               // 订阅
+              _isBusy = true;
               showText(text: '已订阅');
               _followIconValueNotifier.value = !_followIconValueNotifier.value;
               await followProvider.followManga(widget.dto.id);
@@ -175,7 +178,7 @@ class _DetailsState extends State<Details> {
                   child: Directionality(
                     textDirection: TextDirection.rtl,
                     child: ValueListenableBuilder(
-                      valueListenable: _chapterListValueNotifier,
+                      valueListenable: _orderValueNotifier,
                       builder: (context, value, child) => TextButton.icon(
                         style: ButtonStyle(
                           padding: MaterialStateProperty.all(const EdgeInsets.all(0)),
@@ -183,15 +186,15 @@ class _DetailsState extends State<Details> {
                           foregroundColor: MaterialStateProperty.all(Colors.black54),
                         ),
                         label: const Text('排序'),
-                        icon: _chapterListValueNotifier.value
+                        icon: _orderValueNotifier.value == OrderMode.asc
                             ? const Icon(Icons.arrow_upward_rounded, size: 18)
                             : const Icon(Icons.arrow_downward_rounded, size: 18),
                         onPressed: () {
-                          _orderMode == OrderMode.desc
-                              ? _orderMode = OrderMode.asc
-                              : _orderMode = OrderMode.desc;
-
-                          _chapterListValueNotifier.value = !_chapterListValueNotifier.value;
+                          if (_orderValueNotifier.value == OrderMode.desc) {
+                            _orderValueNotifier.value = OrderMode.asc;
+                          } else {
+                            _orderValueNotifier.value = OrderMode.desc;
+                          }
                         },
                       ),
                     ),
@@ -201,9 +204,9 @@ class _DetailsState extends State<Details> {
 
               // 内容
               ValueListenableBuilder(
-                valueListenable: _chapterListValueNotifier,
+                valueListenable: _orderValueNotifier,
                 builder: (context, value, child) => FutureBuilder<List<ChapterDto>>(
-                  future: _chapterListFuture,
+                  future: _getMangaFeed(),
                   builder: (context, snapshot) => BuilderChecker(
                     snapshot: snapshot,
                     waiting: const Center(
@@ -225,7 +228,7 @@ class _DetailsState extends State<Details> {
 
   /// 获取漫画章节
   Future<List<ChapterDto>> _getMangaFeed() async {
-    var response = await MangaApi.getMangaFeedAsync(widget.dto.id,
+    var response = await (_getMangaFeedFuture ??= MangaApi.getMangaFeedAsync(widget.dto.id,
         query: MangaFeedQuery(
           limit: 96,
           offset: 0,
@@ -239,35 +242,46 @@ class _DetailsState extends State<Details> {
           ],
         ),
         // 切勿 readableAt: OrderMode.desc, 否则缺少章节
-        order: MangaFeedOrder(volume: OrderMode.desc, chapter: OrderMode.desc));
+        order: MangaFeedOrder(volume: OrderMode.desc, chapter: OrderMode.desc)));
 
     var newItems = response.data.map((e) => ChapterDto.fromDex(e)).toList();
 
-    // 按章节排序
-    if (_orderMode == OrderMode.desc) {
-      if (newItems
-          .any((value) => value.chapter != null && double.tryParse(value.chapter!) != null)) {
+    if (!newItems
+        .any((value) => value.chapter == null || double.tryParse(value.chapter!) == null)) {
+      // 按章节排序
+      if (_orderValueNotifier.value == OrderMode.desc) {
         newItems.sortByCompare(
           (value) => double.parse(value.chapter!),
           (double a, double b) => b.compareTo(a),
         );
-      }
-    } else {
-      if (newItems
-          .any((value) => value.chapter != null && double.tryParse(value.chapter!) != null)) {
+      } else {
         newItems.sortByCompare(
           (value) => double.parse(value.chapter!),
           (double a, double b) => a.compareTo(b),
         );
       }
+    } else {
+      // 没有章节，按readableAt排序
+      if (_orderValueNotifier.value == OrderMode.desc) {
+        newItems.sortByCompare(
+          (value) => value.readableAt,
+          (DateTime a, DateTime b) => b.compareTo(a),
+        );
+      } else {
+        newItems.sortByCompare(
+          (value) => value.readableAt,
+          (DateTime a, DateTime b) => a.compareTo(b),
+        );
+      }
     }
+
     return newItems;
   }
 
   /// 检测漫画是否被订阅
   Future<bool> _checkUserFollow() async {
     // 未登录，直接返回false
-    if (!await userLoginState()) {
+    if (!await Auth.userLoginState) {
       return false;
     }
 
diff --git a/lib/views/me.dart b/lib/views/me.dart
index 199d162..a6aa5db 100644
--- a/lib/views/me.dart
+++ b/lib/views/me.dart
@@ -5,7 +5,7 @@ import 'package:komikku/dex/apis/user_api.dart';
 import 'package:komikku/provider/user_provider.dart';
 import 'package:komikku/utils/icons.dart';
 import 'package:komikku/utils/toast.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 import 'package:komikku/widgets/builder_checker.dart';
 import 'package:komikku/widgets/icon_text_button.dart';
 import 'package:provider/provider.dart';
@@ -51,7 +51,7 @@ class _MeState extends State<Me> {
                         ),
                         Consumer<UserProvider>(
                           builder: (context, userProvider, child) => FutureBuilder<bool>(
-                            future: userLoginState(),
+                            future: Auth.userLoginState,
                             builder: (context, snapshot) => BuilderChecker(
                               snapshot: snapshot,
                               builder: (context) => OutlinedButton(
@@ -95,7 +95,7 @@ class _MeState extends State<Me> {
                       padding: const EdgeInsets.symmetric(vertical: 10, horizontal: 8),
                       child: Consumer<UserProvider>(
                         builder: (context, userProvider, child) => FutureBuilder<bool>(
-                          future: userLoginState(),
+                          future: Auth.userLoginState,
                           builder: (context, snapshot) => BuilderChecker(
                             snapshot: snapshot,
                             builder: (context) {
@@ -137,7 +137,7 @@ class _MeState extends State<Me> {
 
   /// 获取用户信息
   Future<String> _getUserDetails() async {
-    if (!await userLoginState()) throw Exception('Invalid operation');
+    if (!await Auth.userLoginState) throw Exception('Invalid operation');
 
     var response = await UserApi.getUserDetailsAsync();
     return response.data.attributes.username;
diff --git a/lib/views/subscribes.dart b/lib/views/subscribes.dart
index 6a79ffa..d04afa1 100644
--- a/lib/views/subscribes.dart
+++ b/lib/views/subscribes.dart
@@ -7,7 +7,7 @@ import 'package:komikku/dex/models/query/usual_query.dart';
 import 'package:komikku/dto/manga_dto.dart';
 import 'package:komikku/provider/follow_provider.dart';
 import 'package:komikku/provider/user_provider.dart';
-import 'package:komikku/utils/user.dart';
+import 'package:komikku/utils/auth.dart';
 import 'package:komikku/views/details.dart';
 import 'package:komikku/widgets/builder_checker.dart';
 import 'package:komikku/widgets/grid_view_item.dart';
@@ -83,7 +83,7 @@ class _SubscribesState extends State<Subscribes> {
           // 遮盖的内容（处于上层）
           Consumer2<UserProvider, FollowProvider>(
             builder: (context, userProvider, followProvider, child) => FutureBuilder<bool>(
-              future: userLoginState(),
+              future: Auth.userLoginState,
               builder: (context, snapshot) {
                 return BuilderChecker(
                   snapshot: snapshot,
@@ -96,7 +96,10 @@ class _SubscribesState extends State<Subscribes> {
                       );
                     }
 
-                    _pagingController.refresh();
+                    // 延后1秒钟执行refresh()
+                    var delay = const Duration(seconds: 1);
+                    (() async => await Future.delayed(delay, () => _pagingController.refresh()))();
+
                     return const SizedBox.shrink();
                   },
                 );
@@ -110,6 +113,11 @@ class _SubscribesState extends State<Subscribes> {
 
   /// 获取用户订阅的漫画
   Future<void> _getUserFollowedMangaList(int pageKey) async {
+    if (!await Auth.userLoginState) {
+      _pagingController.appendPage(<MangaDto>[], 0);
+      return;
+    }
+
     var response = await FollowsApi.getUserFollowedMangaListAsync(
       query: UsualQuery(limit: _pageSize, offset: pageKey, includes: ['cover_art', 'author']),
     );
diff --git a/lib/widgets/delay_pop.dart b/lib/widgets/delay_pop.dart
index 804d94f..05b0302 100644
--- a/lib/widgets/delay_pop.dart
+++ b/lib/widgets/delay_pop.dart
@@ -8,7 +8,7 @@ class DelayPop extends StatelessWidget {
     required this.child,
   }) : super(key: key);
 
-  final bool flag;
+  final bool Function() flag;
   final Duration duration;
   final Widget child;
 
@@ -18,7 +18,7 @@ class DelayPop extends StatelessWidget {
       child: child,
       onWillPop: () async {
         // 如果正在执行关键任务，则等待再返回
-        if (flag) await Future.delayed(duration);
+        if (flag()) await Future.delayed(duration);
         return true;
       },
     );
diff --git a/pubspec.lock b/pubspec.lock
index bc44f25..4eed3b5 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -189,7 +189,7 @@ packages:
       name: cupertino_icons
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.4"
+    version: "1.0.5"
   dart_style:
     dependency: transitive
     description:
@@ -264,7 +264,7 @@ packages:
       name: flutter_native_splash
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.2.2"
+    version: "2.2.3"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -449,7 +449,7 @@ packages:
       name: path_provider
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.0.10"
+    version: "2.0.11"
   path_provider_android:
     dependency: transitive
     description: