How to create ngui Atlas in runtime??

Atlas of NGUI is a prefab in the project view. You can add this prefab to the game scene, then in you script, use a public variable to let yourself drag and drop this gameobject. Sample script:

public class AtlasNeedClass { public UIAtlas atlas;

 private UISprite spriteToChangeAtlasAtRuntime;

 void Update()
 {
     spriteToChangeAtlasAtRuntime.atlas = atlas;
 }

}

P.S. Maybe the answer is too late. My purpose is for those guys coming for a solution, since I found this post when I had this question.

Not yet :( Then, I decided to stop work on NGUI as lack information.