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、

[csharp] view plain copy

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、

[csharp] view plain copy

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、

[csharp] view plain copy

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;  
    }  
}  

}