unity text颜色渐变

下面的组件做一个记录，可以使ui自己设置单个文字上下颜色，最终效果为，仿照艺术字

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

[AddComponentMenu("UI/Effect/UIColorGradient")]
public class UIColorGradient : BaseMeshEffect
{
    public static List<UIVertex> helpList = new List<UIVertex>();

    private bool isText;
    private bool isCheck;

    [SerializeField]
    private Color32 topColor = Color.yellow;
    [SerializeField]
    private Color32 bottomColor = Color.red;

  
    protected override void OnEnable()
    {
        base.OnEnable();
        if (this.gameObject.GetComponent<Text>() != null)
            isText = true;
        else
           isText = false;
    }