猜数字配置存储

lib/storage/sp_storage.dart

@@ -0,0 +1,39 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+const String kGuessSpKey = 'guess-config';
+
+class SpStorage {
+  SpStorage._();
+
+  static SpStorage? _storage;
+
+  static SpStorage get instance {
+    _storage = _storage ?? SpStorage._();
+    return _storage!;
+  }
+
+  SharedPreferences? _sp;
+
+  Future<void> initSpWhenNull() async {
+    if (_sp != null) return;
+    _sp = _sp ?? await SharedPreferences.getInstance();
+  }
+
+  Future<bool> saveGuessConfig({
+    bool? guessing,
+    int? value,
+  }) async {
+    await initSpWhenNull();
+    String content = json.encode({'guessing': guessing, 'value': value});
+    return _sp!.setString(kGuessSpKey, content);
+  }
+
+  Future<Map<String,dynamic>> readGuessConfig() async {
+    await initSpWhenNull();
+    String content = _sp!.getString(kGuessSpKey)??"{}";
+    return json.decode(content);
+  }
+
+}