Iphone: make view transparent, but subviews not transparent

Question

I have a custom UIViewController named A, and I want to add its view to another controller view (named B) as a subview. The view contains two buttons as subzones. I want to make A transparent, but the buttons in it are opaque. I want to know if there is a way to do this?

Answer 1

As i noticed

If the view is set to opacity / alpha, all of its subzones will be applied with that opacity / alpha.

Try setting the background color of your views to [UIColor clearColor]

Answer 2

viewA.backgroundColor = [UIColor clearColor];
[viewA addSubview:button1];
[viewA addSubview:button2];