UITexture.mainTexture cannot unload resources?

[hjbo]

code:
      Texture texture = uiTexture .mainTexture;
      mainBGUITexture.mainTexture = Resources.Load(path + "/" + curFrame, typeof(Texture)) as Texture;
      Resources .UnloadAsset (texture);
this code run in Update Function，Resources .UnloadAsset (texture) does not work,but it work well on NGUI 2.6
I did not carefully read UITexture code,but add two lines of code:uiTexture.enable= false;uiTexture.enable= true;
it can UnloadAsset ,why?  Thanks

[ArenMook]

NGUI panels create draw calls. Draw calls reference textures. When you set some UITexture's mainTexture reference, the change won't result in the draw calls being destroyed right away. The call will be delayed.

You need to delay your UnloadAsset call until the end of frame (yield new WaitForEndOfFrame()).

[hjbo]

Thank you very much