如何使viewForHeaderInSection中的背景颜色与titleForHeaderInSection中的背景颜色相同？

I want to highlight one of the titles in grouped section, just like the Calendar application. I am trying to use UILabel as the return view in viewForHeaderInSection. But I am not sure what color is in the default heder. Does anyone know? Thanks a lot.I want to highlight one of the titles in groupe