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Editorial Team
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Asked: 2026-05-27T02:53:36+00:00

When UIAlertViews pop up, there is a vignette effect in the background. That is,

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When UIAlertViews pop up, there is a vignette effect in the background. That is, the edges are darker and the center is lighter.

vignette iOS

I was wondering if this vignette effect was built into Cocoa Touch. I would like to show the vignette behind one of my custom views.

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1 Answer

  1. Editorial Team

    It is built into UIKit (as UIAlertView is part of UIKit), but it’s not public.

    It shouldn’t be too hard to create the same effect, though. It’s just a radial gradient, which you can draw in code or Photoshop.

    UPDATE: If you must know, the background is a class called _UIAlertNormalizingOverlayWindow with the following class hierarchy:

    _UIAlertNormalizingOverlayWindow
_UIAlertOverlayWindow
UIWindow
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