HarmonyOS 鸿蒙Next 关于自定义Dialog弹不出来问题咨询

我这边有一个需求就是，在请求系统权限时候，先弹出一个对话框告诉用户，为什么需要该权限，然后点击对话框的确定，才会去请求系统权限，然后弹出系统权限对话框。

以下是我这边封装的工具类，但是我这边自定义DIalog一直弹不出来。
比如我这边请求方法reqPermissions()传入对应的参数，此时需要弹出我这边自定义的对话框WeDialog，但是现在一直弹不出，
但是，如果我把这个dialogController，直接放入到page中，此时是可以的。 

 

export class PermissionUtils {
  private dialogController?:CustomDialogController;
  private permissions?: Array<Permissions>;
  private permissionCallBack?: PermissionCallBack;

  onCancel() {

  }

  async onAccept() {
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
    try {
      atManager.requestPermissionsFromUser(getContext() as common.UIAbilityContext, this.permissions).then((data) => {
        let grantStatus: Array<number> = data.authResults;
        let length: number = grantStatus.length;
        for (let i = 0; i < length; i++) {
          if (grantStatus[i] === 0) {
            // 用户授权，可以继续访问目标操作
            if (this.permissionCallBack != null) {
              this.permissionCallBack.onAllow();
            }
          } else {
            if (this.permissionCallBack != null) {
              this.permissionCallBack.onDeny();
            }
          }
        }
      }).catch((err: BusinessError) => {
        if (this.permissionCallBack != null) {
          this.permissionCallBack.onDeny();
        }
      })
    } catch (err) {
      if (this.permissionCallBack != null) {
        this.permissionCallBack.onDeny();
      }
    }
  }

  /
   * 检查是否授权
   * @param permission 待检查权限
   * @returns 授权状态
   */
  private async checkAccessToken(permission: Permissions): Promise<abilityAccessCtrl.GrantStatus> {
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
    let grantStatus: abilityAccessCtrl.GrantStatus = abilityAccessCtrl.GrantStatus.PERMISSION_DENIED;
    // 获取应用程序的accessTokenID
    let tokenId: number = 0;
    try {
      let bundleInfo: bundleManager.BundleInfo = await bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION);
      let appInfo: bundleManager.ApplicationInfo = bundleInfo.appInfo;
      tokenId = appInfo.accessTokenId;
    } catch (error) {
      const err: BusinessError = error as BusinessError;
    }
    // 校验应用是否被授予权限
    try {
      grantStatus = await atManager.checkAccessToken(tokenId, permission);
    } catch (error) {
      const err: BusinessError = error as BusinessError;
    }

    return grantStatus;
  }

  /
   * 判断是否授权
   * @param permissions 待判断的权限
   * @returns 已授权true,未授权false
   */
  async checkPermissions(permissions: Permissions): Promise<boolean> {
    //判断是否授权
    let grantStatus: abilityAccessCtrl.GrantStatus = await this.checkAccessToken(permissions);
    if (grantStatus === abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED) {
      //已经授权
      return true;
    } else {
      //未授权
      return false;
    }
  }


  /**
   * 发起授权 以Promise方式返回
   * @param permissions 需要授权的权限
   * @returns 1表示授权成功继续业务操作,-1表示用户拒绝授权
   */
  reqPermissions(permissions: Array<Permissions>, remind: string, callBack: PermissionCallBack) {
    this.permissions = permissions;
    this.permissionCallBack = callBack;
    this.dialogController = new CustomDialogController({
      builder: WeDialog({
        title: “温馨提示”,
        content: “remind”,
        cancel: this.onCancel,
        confirm: this.onAccept,
      }),
      gridCount: 3,
      autoCancel: false,
      alignment: DialogAlignment.Center,
    })
    this.dialogController.open();
  }
}

export interface PermissionCallBack {
  onAllow: () => void
  onDeny: () => void
}