84 lines
2.2 KiB
Dart
84 lines
2.2 KiB
Dart
import 'package:shared_preferences/shared_preferences.dart';
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import 'dart:async';
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class SharedPreferencesUtils {
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static SharedPreferences? _prefs;
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// 初始化
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static Future<void> init() async {
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_prefs = await SharedPreferences.getInstance();
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}
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/// 存储带过期时间的字符串
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/// [key] 键
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/// [value] 值
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/// [expiry] 过期时间（如 Duration(hours: 1)）
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static Future<bool> setStringWithExpiry(
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String key,
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String value,
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Duration expiry,
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) async {
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final prefs = _prefs;
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if (prefs == null) return false;
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final expiryKey = '_expiry_$key'; // 用 _expiry_ 前缀标记过期时间
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final expireAt = DateTime.now().add(expiry).millisecondsSinceEpoch;
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// 使用 Transaction 确保原子性（可选）
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return await prefs.setString(key, value) &&
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await prefs.setInt(expiryKey, expireAt);
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}
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/// 获取带过期时间的字符串
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/// 如果已过期，则自动删除并返回 null
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static String? getStringWithExpiry(String key) {
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final prefs = _prefs;
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if (prefs == null) return null;
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final expiryKey = '_expiry_$key';
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final expireAt = prefs.getInt(expiryKey);
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// 如果没有过期时间，视为永不过期（或已过期？根据需求）
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if (expireAt == null) {
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return prefs.getString(key);
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}
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// 比较当前时间
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final now = DateTime.now().millisecondsSinceEpoch;
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if (now > expireAt) {
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// 已过期，清理
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removeKeyWithExpiry(key);
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return null;
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}
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return prefs.getString(key);
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}
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/// 删除带过期时间的键（清理 value 和 expiry）
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static Future<void> removeKeyWithExpiry(String key) async {
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final prefs = _prefs;
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if (prefs == null) return;
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final expiryKey = '_expiry_$key';
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await prefs.remove(key);
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await prefs.remove(expiryKey);
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}
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static Future<bool> setString(String key, String value) async {
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return _prefs?.setString(key, value) ?? Future.value(false);
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}
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static String? getString(String key) {
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return _prefs?.getString(key);
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}
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// bool
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static Future<void> setBool(String key, dynamic value) async {
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_prefs?.setBool(key, value);
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}
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static Future<bool?> getBool(String key) async {
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return _prefs?.getBool(key);
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}
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}
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