unity ugui image更换图片

1：利用资源加载方式

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;  

 public class ChangeImage : MonoBehaviour
 {
   public   Image myImage;  

    // Use this for initialization
     void Start()
     {
 //需要自己在Assets下创建Resources文件夹，imagename是Resources下的图片名字
         myImage.sprite = Resources.Load("imagename", typeof(Sprite)) as Sprite;     // Image/pic 在 Assets/Resources/目录下
     }
 }  

2:直接拉取赋值

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;  

 public class ChangeImage : MonoBehaviour
 {
   public   Image myImage;
   public   Sprite mySprite;
     // Use this for initialization
     void Start()
     {
         myImage.sprite = mySprite;
     }
 }

3：网络下载更换

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;  

 public class ChangeImage : MonoBehaviour
 {
   public   Image myImage;  

     // Use this for initialization
     void Start()
     {
        StartCoroutine(WWWGetImage());
     }  

      IEnumerator WWWGetImage()
   {
       string url = "http://pic02.1sucai.com/190302/330853-1Z302203J169-lp.jpg";
       WWW www = new WWW(url);
       yield return www;
       if (string.IsNullOrEmpty(www.error))
       {
           Texture2D tex = www.texture;
           Sprite temp = Sprite.Create(tex, new Rect(, , tex.width, tex.height), Vector2.zero);
          myImage.sprite = temp;
       }
   }  

 }