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. In HTML, Javascript it looks like so - How do I get this same effect in iOS ?

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. In HTML, Javascript it looks like so - How do I get this same effect in iOS ?
