Hello Reader's

If you want to blur image in objective c and swift then copy this code in your project and just call this function. In this code , Blur effect is 50 percent .

For Objective C :-

-(UIImage *)convertToBlurImage:(UIImage *)image{
    CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [gaussianBlurFilter setDefaults];
    CIImage *inputImage = [CIImage imageWithCGImage:[image CGImage]];
    [gaussianBlurFilter setValue:inputImage forKey:kCIInputImageKey];
    [gaussianBlurFilter setValue:@50 forKey:kCIInputRadiusKey];

    CIImage *outputImage = [gaussianBlurFilter outputImage];
    CIContext *context   = [CIContext contextWithOptions:nil];
    CGImageRef cgimg     = [context createCGImage:outputImage fromRect:[inputImage extent]];  // note, use input image extent if you want it the same size, the output image extent is larger
    UIImage *convertedImage = [UIImage imageWithCGImage:cgimg];
    return convertedImage;
}

For Swift :-

func convertToBlurImage(image:UIImage)->(UIImage){
        var imageToBlur = CIImage(image: image)
        var blurfilter = CIFilter(name: "CIGaussianBlur")
        blurfilter.setValue("5", forKey:kCIInputRadiusKey)
        blurfilter.setValue(imageToBlur, forKey: "inputImage")
        var resultImage = blurfilter.valueForKey("outputImage") as CIImage
        var blurredImage = UIImage(CIImage: resultImage)
        return blurredImage!
    }