HarmonyOS 鸿蒙Next UserAuthIcon的问题

只需要将控件写在页面的生命周期 aboutToAppear 里面就可以， 如：

aboutToAppear(): void {
  try {
  const rand = cryptoFramework.createRandom();
  const len: number = 16;
  const randData: Uint8Array = rand?.generateRandomSync(len)?.data;
  // 设置认证参数
  const authParam: userAuth.AuthParam = {
    challenge: randData,
    authType: [userAuth.UserAuthType.PIN, userAuth.UserAuthType.FACE],
    authTrustLevel: userAuth.AuthTrustLevel.ATL3,
  };
  // 配置认证界面
  const widgetParam: userAuth.WidgetParam = {
    title: '请进行身份认证',
  };
  // 获取认证对象
  const userAuthInstance = userAuth.getUserAuthInstance(authParam, widgetParam);
  console.info('get userAuth instance success');
  // 订阅认证结果
  userAuthInstance.on('result', {
    onResult(result) {
      console.info(`userAuthInstance callback result: ${JSON.stringify(result)}`);
      // 可在认证结束或其他业务需要场景，取消订阅认证结果
      userAuthInstance.off('result');
    }
  });
  console.info('auth on success');
  userAuthInstance.start();
  console.info('auth start success');
  } catch (error) {
    const err: BusinessError = error as BusinessError;
    console.error(`auth catch error. Code is ${err?.code}, message is ${err?.message}`);
  }
}