Screenshot and Blur

UIImage+Blur.swift

    private func screenshot() -> UIImage? {
        let format = UIGraphicsImageRendererFormat()
        format.scale = UIScreen.main.scale
        format.opaque = false
        let renderer = UIGraphicsImageRenderer(bounds: layer.bounds, format: format)
        return renderer.image { _ in
            self.drawHierarchy(in: bounds, afterScreenUpdates: false)
        }
    }

    private func blur(_ image: UIImage?) -> UIImage? {
        guard let image = image, let ciImage = CIImage(image: image) else { return nil }

        let blurFilter = CIFilter(name: "CIGaussianBlur")
        blurFilter?.setValue(ciImage, forKey: kCIInputImageKey)
        blurFilter?.setValue(20, forKey: kCIInputRadiusKey)
        guard let outputCIImage = blurFilter?.outputImage else { return nil }

        let croppedImage = outputCIImage.cropped(to: ciImage.extent)
        return UIImage(ciImage: croppedImage)
    }