UIImage+Blur+Swift4.swift

extension UIImage {
    func blurred(radius: CGFloat) -> UIImage {
        let ciContext = CIContext(options: nil)
        guard let cgImage = cgImage else { return self }
        let inputImage = CIImage(cgImage: cgImage)
        guard let ciFilter = CIFilter(name: "CIGaussianBlur") else { return self }
        ciFilter.setValue(inputImage, forKey: kCIInputImageKey)
        ciFilter.setValue(radius, forKey: "inputRadius")
        guard let resultImage = ciFilter.value(forKey: kCIOutputImageKey) as? CIImage else { return self }
        guard let cgImage2 = ciContext.createCGImage(resultImage, from: inputImage.extent) else { return self }
        return UIImage(cgImage: cgImage2)
    }
}