iPhone SDK: Non-transparent subviews in transparent view

Question

I have a subview that has been added to my UIView. The idea is that the subview is a hovering panel with uibuttons. The subview is given an alpha of 0.2, as the user needs

Answer 1

Instead of

topHoverView.backgroundColor = [UIColor transparentColor];

, the following code is right.

topHoverView.backgroundColor = [UIColor clearColor];