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iOS 高斯模糊效果

        CIContext *context = [CIContext contextWithOptions:nil];
        CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:@"icon-user"]];
        // create gaussian blur filter
        CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
        [filter setValue:inputImage forKey:kCIInputImageKey];
        [filter setValue:[NSNumber numberWithFloat:3.0] forKey:@"inputRadius"];
        // blur image
        CIImage *result = [filter valueForKey:kCIOutputImageKey];
        CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
        UIImage *image = [UIImage imageWithCGImage:cgImage];
        CGImageRelease(cgImage);
        mainImage.image = image;