Unity UGUI替换Image图片的三种方式

在NGUI中，我们可以直接用spriteName = “想要替换的图片名称”;  就可以很方便的替换资源

而UGUI却相对要麻烦一点，下面为大家介绍比较常用的三种替换方式。

一、

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

 public class Test : MonoBehaviour
 {

     [SerializeField]
     Image myImage;

     // Use this for initialization
     void Start()
     {
         myImage.sprite = Resources.Load("Image/pic", typeof(Sprite)) as Sprite;     // Image/pic 在 Assets/Resources/目录下
     }
 }

二、

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

 public class Test : MonoBehaviour
 {

     [SerializeField]
     Image myImage;

     [SerializeField]
     Sprite mySprite;

     // Use this for initialization
     void Start()
     {
         myImage.sprite = mySprite;      // mySprite 为外部指定的图片资源
     }
 }

三、

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

 public class Test : MonoBehaviour {

     [SerializeField]
     Image myImage;

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

     IEnumerator GetImage()
     {
         string url = "http://www.5dbb.com/images/logo.gif";
         WWW www = new WWW(url);
         yield return www;
         if (string.IsNullOrEmpty(www.error))
         {
             Texture2D tex = www.texture;
             Sprite temp = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0, 0));
             myImage.sprite = temp;
         }
     }
 }