unity实现UI文字和图片淡入淡出

using UnityEngine;
using UnityEngine.UI;

public class CrossFadeAlphaTest : MonoBehaviour
{
Graphic graphicText;
Graphic graphicImage;
public Text text01;//文字
public Image image1;//图片

void Start()
 {
     graphicText = text01.GetComponent<Graphic>();
     graphicImage = image1.GetComponent<Graphic>();
     graphicText.CrossFadeAlpha(0f, 0f, false);//开始时隐藏透明度为0
     graphicImage.CrossFadeAlpha(0f, 0f, false);
 }
 //淡出
 void Hidden()
 {
     graphicText.CrossFadeAlpha(0f, 2f, false);
     graphicImage.CrossFadeAlpha(0f, 2f, false);
 }

//一秒淡入，4秒后淡出
 public void Show()
 {

    graphicText.CrossFadeAlpha(1f, 1f, true);//(1-0透明度,变化时间，显示或隐藏）
     graphicImage.CrossFadeAlpha(1f, 1f, true);
     Invoke("Hidden", 4);
 }
 

}