sp_util.dart
1.16 KB
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import 'package:shared_preferences/shared_preferences.dart';
class SpUtil {
SharedPreferences? _prefs;
static SpUtil? _instance;
SpUtil.of() {
init();
}
SpUtil._pre(SharedPreferences prefs) {
_prefs = prefs;
}
static SpUtil getInstance() {
_instance ??= SpUtil.of();
return _instance!;
}
void init() async {
_prefs ??= await SharedPreferences.getInstance();
}
static Future<SpUtil> preInit() async {
if (_instance == null) {
var prefs = await SharedPreferences.getInstance();
_instance = SpUtil._pre(prefs);
}
return _instance!;
}
void setData<T>(String key, T data) {
if (data is String) {
_prefs?.setString(key, data);
} else if (data is double) {
_prefs?.setDouble(key, data);
} else if (data is int) {
_prefs?.setInt(key, data);
} else if (data is bool) {
_prefs?.setBool(key, data);
} else if (data is List<String>) {
_prefs?.setStringList(key, data);
}
}
void remove(String key) {
_prefs?.remove(key);
}
T? get<T>(String key) {
var value = _prefs?.get(key);
if (value != null) {
return value as T;
}
return null;
}
}