Unity mask click the lower UI game to start guiding Click

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class DIANJI : MonoBehaviour, ICanvasRaycastFilter
{
    /// <summary>
    ///  Button to click 
    /// </summary>
    public GameObject onClockButton;
    public bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
    {
        Vector2 localPoint;
        Debug.Log(screenPoint);
        RectTransformUtility.ScreenPointToLocalPointInRectangle(GameObject.Find("Canvas").GetComponent<RectTransform>(),screenPoint, eventCamera, out localPoint);

        if (onClockButton.GetComponent<RectTransform>().rect.Contains(localPoint))
        {
            return false;
        }
        else {
            return true;
        }

    }
}

The code is mounted to the to be penetrated UI On

Use mask to

  Turn off the click event response of the mask