UGUI更换图片的三种方法

//方法一： Image/pic 在 Assets/Resources/目录下 
Image _myImage; 
void Start()
{
    _myImage.sprite = Resources.Load("Image/pic", typeof(Sprite)) as Sprite;
}

//方法二：mySprite 为外部指定的图片资源

Image _myImage; 

Sprite _ISprite; void Start()
 {

　　_myImage.sprite = ISprite
 } 

//方法三 
Image myImage; 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; 
} 
}