How to blur an existing image in a UIImageView with Swift?

Question

The setup is simple.

• A ViewController with UIImageView that has an image assigned.
• A UIButton that when clicked blurs the image in the UIImageView.<

Answer 1

my extension

extension UIImage {
    
    func blurImage(radius: CGFloat = 10) -> UIImage? {
        guard let cgImage = cgImage else { return nil }
        let inputCIImage = CIImage(cgImage: cgImage)
        let context = CIContext(options: nil)
        
        let filter = CIFilter(name: "CIGaussianBlur")
        filter?.setValue(inputImage, forKey: kCIInputImageKey)
        filter?.setValue(radius, forKey: kCIInputRadiusKey)
        let outputImage = filter?.outputImage
        
        if let outputImage = outputImage,
            let cgImage = context.createCGImage(outputImage, from: inputImage.extent) {
            
            return UIImage(
                cgImage: cgImage,
                scale: scale,
                orientation: imageOrientation
            )
        }
        return nil
    }
 }