我不能让OnMouseOver()注意到我的鼠标悬停在c# (Unity)中的一个按钮上

using UnityEngine;

public class ButtonHover : MonoBehaviour
{
    private Color originalColor;
    private Color hoverColor = Color.red;
    private Renderer buttonRenderer;

    private void Start()
    {
        buttonRenderer = GetComponent<Renderer>();
        originalColor = buttonRenderer.material.color;
    }

    private void OnMouseOver()
    {
        buttonRenderer.material.color = hoverColor;
    }

    private void OnMouseExit()
    {
        buttonRenderer.material.color = originalColor;
    }
}