How to check on which layer the mouse is pressed and combine it with the movement of a click

I have a click to move option I learned from this guide:

The tutorial is excellent, but I do not know how to combine a test of which layer the past is clicked on, because I do not want for example, that when the mouse is clicked on the UI the character will not move foreign?

 

please help me!

 

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.EventSystems; // Add this line
5.  
6. public class ClickToMove : MonoBehaviour
7. {
8.     ...
9.  
10.     void Update()
11.     {
12.         if (Input.GetMouseButton(0))
13.         {
14.             // Check if mouse button was clicked over a UI element
15.             if (EventSystem.current.IsPointerOverGameObject())
16.             {
17.                 Debug.Log("Clicked on the UI");
18.                 return;
19.             }
20.  
21.             SetTargetPosition();
22.         }
23.  
24.         if (isMoving)
25.         {
26.             Move();
27.         }
28.     }
29.  
30.     ...
31. }

 

Thanks a lot for the help, but I want to check by layer and not by GameObject there is a way?