HarmonyOS ObjectLink修饰符对象的属性改变不能引起UI刷新

ohpm install reflect-metadata 
ohpm install class-transformer

import { Type } from 'class-transformer' 
import 'reflect-metadata' 
 
@Observed 
export class StationSearchFilterEntity{ 
  @Type(() => FirstCategory) 
  filter: FirstCategory[] = []; // 公共站下拉筛选条件 
  @Type(() => QuickFilter) 
  homeFilter:QuickFilter[] = []; //快捷筛选 
  @Type(() => ActivityFilter) 
  activityFilter:ActivityFilter[] = []; //活动筛选条件 
} 
 
/** 
 * 电站 筛选的一级 
 */ 
@Observed 
export class FirstCategory{ 
  filterTypeName:string = ""; 
  filterTypeDesc:string = ""; 
  descUrl:string = ""; //代表是否有问号,点击打开具体描述 
  // filterItem:SecondCategoryArray = new SecondCategoryArray(); 
  @Type(()=> SecondCategory) 
  filterItem: SecondCategory[] = [] 
} 
 
 
/** 
 * 电站 筛选的二级 
 */ 
@Observed 
export class SecondCategory{ 
  itemCode:string = ""; 
  itemName:string = ""; 
  isSelected?: boolean = false; 
  @Type(()=> ThirdCategory) 
  stationOwner:ThirdCategory[] = []; 
}

import { Type, plainToClass } from 'class-transformer' 
import 'reflect-metadata' 
 
// 需要定义一个新的类型，用来转换 
class ResponseObj { 
  @Type(() => StationSearchFilterEntity) 
  data: StationSearchFilterEntity = new StationSearchFilterEntity(); 
} 
 
// 在获取数据的地方使用以下方法获取 
 let response = JSON.parse(retStr) 
 let respObj: ResponseObj = plainToClass(ResponseObj, response) 
 this.filter = respObj.data.filter 
 this.homeFilter = respObj.data.homeFilter; 
 this.activityFilter = respObj.data.activityFilter;