HarmonyOS 鸿蒙Next--MVVM模式 数据独立请求

HarmonyOS 鸿蒙Next–MVVM模式 数据独立请求

1、代码：

@Observed
export class BaseModel {
  private static instance: BaseModel;

  public static getInstance(): BaseModel {
    if (!BaseModel.instance) {
      BaseModel.instance = new BaseModel();
    }
    return BaseModel.instance;
  }

  /**
   * 获取字典数据
   * @param key
   * @returns
   */
  getDict(key: string): Promise<DictBean[]> {
    return new Promise((resolve, reject) => {
      let params: ParamsModel = {
        param: {
          "fieldName": key,
        }
      }
      HttpUtils.post(HttpUrl.OS_DICT, params)
        .then((res) => {
          let c = JSON.parse(res) as HttpDataList<DictBean>
          if (c.code === 200) {
            resolve(c.data as DictBean[])
          } else {
            reject();
          }
        })
    });
  }
}

1、调用

  private baseModel: BaseModel = BaseModel.getInstance();

  aboutToAppear(): void {
    this.baseModel.getDict(DictKey.APPLY_STATE_MY).then((res: DictBean[]) => {
      this.dictList = res
    })
  }