46 lines
1.1 KiB
Dart
46 lines
1.1 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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class ThemeService {
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static const _prefKey = 'theme_mode';
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static final ValueNotifier<ThemeMode> notifier = ValueNotifier(
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ThemeMode.system,
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);
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/// 启动时调用（main.dart）
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static Future<void> init() async {
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final prefs = await SharedPreferences.getInstance();
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final saved = prefs.getString(_prefKey);
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notifier.value = _parse(saved);
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}
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/// 菜单里调用
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static Future<void> setMode(ThemeMode mode) async {
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notifier.value = mode;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setString(_prefKey, _name(mode));
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}
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static ThemeMode _parse(String? s) {
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switch (s) {
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case 'light':
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return ThemeMode.light;
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case 'dark':
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return ThemeMode.dark;
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default:
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return ThemeMode.system;
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}
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}
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static String _name(ThemeMode m) {
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switch (m) {
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case ThemeMode.light:
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return 'light';
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case ThemeMode.dark:
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return 'dark';
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case ThemeMode.system:
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return 'system';
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}
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}
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}
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