addClothingItems static method
批量添加衣物
Implementation
static Future<void> addClothingItems(List<ClothingItem> newItems) async {
final prefs = await SharedPreferences.getInstance();
final items = await getAllClothingItems();
items.addAll(newItems);
final jsonList = items.map((item) => item.toJson()).toList();
await prefs.setString(_keyClothingItems, jsonEncode(jsonList));
}