From f9f7031cd8f9ab443c1f4bb8b156d19f3e8226fd Mon Sep 17 00:00:00 2001
From: wangjia <809946525@qq.com>
Date: Wed, 24 Jun 2026 21:46:51 +0800
Subject: [PATCH] =?UTF-8?q?feat(client):=20=E4=B8=BB=E9=A2=98=E9=80=89?=
 =?UTF-8?q?=E6=8B=A9=20controller=20+=20SharedPreferences=20=E6=8C=81?=
 =?UTF-8?q?=E4=B9=85=E5=8C=96?=
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 client/lib/core/theme/theme_controller.dart  | 25 ++++++++++++++++++++
 client/test/theme/theme_controller_test.dart | 25 ++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 client/lib/core/theme/theme_controller.dart
 create mode 100644 client/test/theme/theme_controller_test.dart

diff --git a/client/lib/core/theme/theme_controller.dart b/client/lib/core/theme/theme_controller.dart
new file mode 100644
index 0000000..2d8fb66
--- /dev/null
+++ b/client/lib/core/theme/theme_controller.dart
@@ -0,0 +1,25 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+const _kKey = 'app_theme';
+const _kValid = {'a', 'b', 'c'};
+
+class ThemeController extends StateNotifier<String> {
+  ThemeController() : super('a');
+
+  Future<void> restore() async {
+    final prefs = await SharedPreferences.getInstance();
+    final v = prefs.getString(_kKey);
+    if (v != null && _kValid.contains(v)) state = v;
+  }
+
+  Future<void> set(String key) async {
+    if (!_kValid.contains(key)) return;
+    state = key;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_kKey, key);
+  }
+}
+
+final themeControllerProvider =
+    StateNotifierProvider<ThemeController, String>((ref) => ThemeController());
diff --git a/client/test/theme/theme_controller_test.dart b/client/test/theme/theme_controller_test.dart
new file mode 100644
index 0000000..5d8c33e
--- /dev/null
+++ b/client/test/theme/theme_controller_test.dart
@@ -0,0 +1,25 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:jiu_client/core/theme/theme_controller.dart';
+
+void main() {
+  setUp(() => SharedPreferences.setMockInitialValues({}));
+
+  test('默认 a；set 持久化并可 restore', () async {
+    final c = ProviderContainer();
+    expect(c.read(themeControllerProvider), 'a');
+    await c.read(themeControllerProvider.notifier).set('c');
+    expect(c.read(themeControllerProvider), 'c');
+
+    final c2 = ProviderContainer();
+    await c2.read(themeControllerProvider.notifier).restore();
+    expect(c2.read(themeControllerProvider), 'c');
+  });
+
+  test('非法 key 被忽略', () async {
+    final c = ProviderContainer();
+    await c.read(themeControllerProvider.notifier).set('zzz');
+    expect(c.read(themeControllerProvider), 'a');
+  });
+}