自定义昵称和头像

lib/utils/user_prefs.dart

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+import 'package:shared_preferences/shared_preferences.dart';
+
+/// 用户偏好设置管理
+class UserPrefs {
+  static final UserPrefs _instance = UserPrefs._internal();
+  static SharedPreferences? _prefs;
+  
+  factory UserPrefs() => _instance;
+  UserPrefs._internal();
+  
+  /// 初始化
+  static Future<void> init() async {
+    _prefs = await SharedPreferences.getInstance();
+  }
+  
+  /// 获取实例
+  SharedPreferences get prefs {
+    if (_prefs == null) {
+      throw Exception('UserPrefs not initialized. Call UserPrefs.init() first.');
+    }
+    return _prefs!;
+  }
+  
+  // ========== 用户信息 ==========
+  
+  /// 昵称
+  String get nickname => prefs.getString('nickname') ?? '记录者';
+  Future<bool> setNickname(String value) => prefs.setString('nickname', value);
+  
+  /// 座右铭
+  String get motto => prefs.getString('motto') ?? '记录生活，沉淀思考';
+  Future<bool> setMotto(String value) => prefs.setString('motto', value);
+  
+  /// 头像路径
+  String? get avatarPath => prefs.getString('avatarPath');
+  Future<bool> setAvatarPath(String value) => prefs.setString('avatarPath', value);
+  Future<bool> clearAvatarPath() => prefs.remove('avatarPath');
+  
+  // ========== 应用设置 ==========
+  
+  /// 是否暗黑模式
+  bool get isDarkMode => prefs.getBool('isDarkMode') ?? false;
+  Future<bool> setDarkMode(bool value) => prefs.setBool('isDarkMode', value);
+  
+  /// 是否首次启动
+  bool get isFirstLaunch => prefs.getBool('isFirstLaunch') ?? true;
+  Future<bool> setFirstLaunch(bool value) => prefs.setBool('isFirstLaunch', value);
+}