iOS Dim background when a view is shown

Question

In my main view, I do some gesture action causing some new view to be shown. At this time I want to dim the entire background (except this new view) as a good UI practice. I

Answer 1

Lay a UIView over the background, set its background to [UIColor blackColor] and set its opacity to like 0.6. Then add that UIView to the parent view.

This'll dim out the background AND intercept any taps to background controls.