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    <p>Every response here is using <strong>vImageBoxConvolve_ARGB8888</strong> this function is really, really slow, that is fine, if the performance is not a high priority requirement, but if you are using this for transitioning between two View Controllers (for example) this approach means times over 1 second or maybe more, that is very bad to the user experience of your application.</p> <p>If you prefer leave all this image processing to the GPU (And you should) you can get a much better effect and also awesome times rounding 50ms (supposing that you have a time of 1 second in the first approach), so, lets do it.</p> <p>First download the GPUImage Framework (BSD Licensed) <a href="https://github.com/BradLarson/GPUImage" rel="noreferrer">here</a>.</p> <p>Next, Add the following classes (.m and .h) from the GPUImage (I'm not sure that these are the minimum needed for the blur effect only)</p> <ul> <li>GPUImage.h</li> <li>GPUImageAlphaBlendFilter</li> <li>GPUImageFilter</li> <li>GPUImageFilterGroup</li> <li>GPUImageGaussianBlurPositionFilter</li> <li>GPUImageGaussianSelectiveBlurFilter</li> <li>GPUImageLuminanceRangeFilter</li> <li>GPUImageOutput</li> <li>GPUImageTwoInputFilter</li> <li>GLProgram</li> <li>GPUImageBoxBlurFilter</li> <li>GPUImageGaussianBlurFilter</li> <li>GPUImageiOSBlurFilter</li> <li>GPUImageSaturationFilter</li> <li>GPUImageSolidColorGenerator</li> <li>GPUImageTwoPassFilter</li> <li><p>GPUImageTwoPassTextureSamplingFilter</p></li> <li><p>iOS/GPUImage-Prefix.pch</p></li> <li>iOS/GPUImageContext </li> <li>iOS/GPUImageMovieWriter</li> <li>iOS/GPUImagePicture</li> <li>iOS/GPUImageView</li> </ul> <p>Next, create a category on UIImage, that will add a blur effect to an existing UIImage:</p> <pre><code>#import "UIImage+Utils.h" #import "GPUImagePicture.h" #import "GPUImageSolidColorGenerator.h" #import "GPUImageAlphaBlendFilter.h" #import "GPUImageBoxBlurFilter.h" @implementation UIImage (Utils) - (UIImage*) GPUBlurredImage { GPUImagePicture *source =[[GPUImagePicture alloc] initWithImage:self]; CGSize size = CGSizeMake(self.size.width * self.scale, self.size.height * self.scale); GPUImageBoxBlurFilter *blur = [[GPUImageBoxBlurFilter alloc] init]; [blur setBlurRadiusInPixels:4.0f]; [blur setBlurPasses:2.0f]; [blur forceProcessingAtSize:size]; [source addTarget:blur]; GPUImageSolidColorGenerator * white = [[GPUImageSolidColorGenerator alloc] init]; [white setColorRed:1.0f green:1.0f blue:1.0f alpha:0.1f]; [white forceProcessingAtSize:size]; GPUImageAlphaBlendFilter * blend = [[GPUImageAlphaBlendFilter alloc] init]; blend.mix = 0.9f; [blur addTarget:blend]; [white addTarget:blend]; [blend forceProcessingAtSize:size]; [source processImage]; return [blend imageFromCurrentlyProcessedOutput]; } @end </code></pre> <p>And last, add the following frameworks to your project:</p> <p>AVFoundation CoreMedia CoreVideo OpenGLES</p> <p>Yeah, got fun with this much faster approach ;) </p>
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    1. POHow can I produce an effect similar to the iOS 7 blur view?
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