How to dim a parent UIView (50% transparent) for login?

Question

I have a view with a Login button. When the button is clicked, I add a view with fields for login. When this happens, I need to dim the parent view. How I do that?

Answer 1

Add a UIView over the parent view that is initially transparent with a background color of black. When you need to dim it, change the view's alpha to 0.5. This will be 50% transparent.