解决在Unity中使用FairyGUI遇到的坑

//Unity, 这里加载的是路径为Assets/Resources/demo/aimage的一个贴图
aLoader.url = “demo/aimage”;

class MyGLoader  : GLoader
{
    override protected function LoadExternal()
    {
        
    }
    override protected function FreeExternal(NTexture texture)
    {
        //释放外部载入的资源
    }
}

UIObjectFactory.SetLoaderExtension(typeof(MyGLoader));

  protected override void LoadExternal()
        {
         // 这里使用成员变量url查找Sprite载入即可
            if (url.Length > 0)
            {
             Sprite tSprite= Resources.Load<Sprite>(url);
              this.onExternalLoadSuccess(new NTexture(tSprite));
            }

            this.onExternalLoadFailed();
        }

protected override void LoadExternal()
 {
 if (url.Length > 0)
     {
      Sprite[] tSprites= Resources.LoadAll<Sprite>(url);
      Sprite tSprite = tSprites[0];
      // 这里需要将Y轴反转
      Rect tShowRect = new Rect(tSprite.textureRect.x, tSprite.texture.height - tSprite.textureRect.y - tSprite.textureRect.height, 
              tSprite.textureRect.width, tSprite.textureRect.height);
         this.onExternalLoadSuccess(new NTexture(tSprite.texture, tShowRect));
     }
 }

// 获取精灵在其纹理上使用的矩形。如果这个精灵被紧紧地打包在一个地图集中，则引发一个异常。
textureRect   Get the rectangle this sprite uses on its texture. Raises an exception if this sprite is tightly packed in an atlas.

// FairyGUI官方给予的案例
GGraph holder = new GGraph();
holder.SetSize(100, 100);
holder.DrawRect(...);
aComponent.AddChild(holder);
holder.SetNativeObject(aSprite);

Texture2D tTx2D = Resources.Load<Texture2D>(strPath);
this.onExternalLoadSuccess(new NTexture(tTx2D));