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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 ?
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Inside the prepareForPopoverPresentation function, set the alpha of the background views to a value less than one. This will dim the background views when the popover is displayed.
Instead, if you want to dim stuff you need to do it yourself: create a full-screen UIView with a translucent background color (I find 66% black works best) then set its alpha to be 0. When you want things to dim, set the alpha to be 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.
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