test001/lib/scenes/public.dart

import 'dart:convert';

import 'package:demo001/scenes/login/model/login_model.dart';
import 'package:shared_preferences/shared_preferences.dart';

Future<LoginModel?> getSharedLoginInfo() async {
  final instance = await SharedPreferences.getInstance();
  final loginInfoStr = instance.getString('loginInfo');
  if (loginInfoStr != null && loginInfoStr != '') {
    return LoginModel.fromJson(jsonDecode(loginInfoStr));
  } else {
    return null;
  }
}