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POHow can I produce an effect similar to the iOS 7 blur view?
 

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  1. POHow can I produce an effect similar to the iOS 7 blur view?
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    <p>I'm trying to replicate this blurred background from Apple's publicly released iOS 7 example screen:</p> <p><img src="https://i.stack.imgur.com/whHSxm.jpg" alt="iOS 7 Control Center screenshot"></p> <p><a href="https://stackoverflow.com/questions/17036655/ios-7-style-blur-view">This question</a> suggests applying a CI filter to the contents below, but that's a whole different approach. It's obvious that iOS 7 doesn't capture the contents of the views below, for many reasons:</p> <ol> <li>Doing some rough testing, capturing a screenshot of the views below and applying a CIGaussianBlur filter with a large enough radius to mimic iOS 7's blur style takes 1-2 seconds, even on a simulator.</li> <li>The iOS 7 blur view is able to blur over dynamic views, such as a video or animations, with no noticeable lag.</li> </ol> <p>Can anyone hypothesize what frameworks they could be using to create this effect, and if it's possible to create a similar effect with current public APIs?</p> <p><strong>Edit:</strong> (from comment) We don't exactly know how Apple is doing it, but are there any basic assumptions we can make? We can assume they are using hardware, right? </p> <p>Is the effect self-contained in each view, such that the effect doesn't actually know what's behind it? Or must, based on how blurs work, the contents behind the blur be taken into consideration? </p> <p>If the contents behind the effect are relevant, can we assume that Apple is receiving a "feed" of the contents below and continuously rendering them with a blur? </p>
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      1. POHow can I produce an effect similar to the iOS 7 blur view?
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    1. CO(I think we can assume that apple is using pure GL to render the home screens anyway. I doubt they're abstracting it with UIViews and other things which would degrade performance, since it's such a key part of the OS)
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      1. POHow can I produce an effect similar to the iOS 7 blur view?
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    2. COAs I indicated in the comments to my answer here: http://stackoverflow.com/a/17048668/19679 they wrote the OS, so of course they're going to have accelerated access to the contents of layers composited below the current view. We can see some of what they might be using in the private IOSurface API: http://stackoverflow.com/questions/14135215/iosurfaces-artefacts-in-video-and-unable-to-grab-video-surfaces . Gaussian blurs can be made much faster than the generalized Gaussian blur cases if they have a fixed radius, or even use interesting optimizations like integral images.
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    3. CO@BradLarson - To paraphrase Jessica Simpson... I have no idea what all that means but it sounds cool as heck! But seriously, are you saying that you can use a partially transparent view with a a blur filter and lay it over another view to achieve this effect?
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