clear method

@override FutureOr<bool> clear()

Clear all values

Implementation

@override
FutureOr<bool> clear() async {
  var result = true;
  if (prefix == '') {
    result = await sharedPreferences.clear();
  } else {
    for (final key in sharedPreferences.getKeys()) {
      if (key.startsWith(prefix)) {
        if (!await sharedPreferences.remove(key)) {
          result = false;
        }
      }
    }
  }

  super.clear();
  return result;
}