flutter中本地存储shared_preferences的使用·

dependencies:
  flutter:
    sdk: flutter
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  shared_preferences: 

import 'package:shared_preferences/shared_preferences.dart';
/**
 * @des SharedPreferences 工具类
 * @author liyongli 20190522
 * */
class SharedPreferencesDataUtils{
  // 保存数据
  Future setUserInfo(key, value) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    sp.setString(key, value);
  }
  // 获取数据
  Future getUserInfo(key) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    print(sp.get(key));
    return sp.get(key);
  }
  // 清除数据
  Future deleteUserInfo(key) async{
    SharedPreferences sp = await SharedPreferences.getInstance();
    sp.remove(key);
  }
}

    SharedPreferencesDataUtils spDataUtils = new SharedPreferencesDataUtils();
    spDataUtils.setUserInfo("name","Flutter Flutter Flutter");
    spDataUtils.setUserInfo("type","Save Save Save");
    print(dataUtils.getUserInfo("name"));
    print(dataUtils.getUserInfo("type"));