Hi everyone,

when I choose image from library and slide the intensity changed I getting this error : Thread 1: "-[UISlider doubleValue]: unrecognized selector sent to instance 0x156b0b600"

import CoreImage
import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet var Intensity: UISlider!
    @IBOutlet var imageView: UIImageView!
    var currentImage: UIImage!

    var context: CIContext!
    var currentFilter: CIFilter!

    override func viewDidLoad() {
        super.viewDidLoad()

        title = "Instafilter"
        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(importPicture))

        context = CIContext()
        currentFilter = CIFilter(name: "CISepiaTone")
        applyProcessing()

    }

    @objc func importPicture() {
        let picker = UIImagePickerController()
        picker.allowsEditing = true
        picker.delegate = self
        present(picker, animated: true)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        guard let image = info[.editedImage] as? UIImage else {return}

        dismiss(animated: true)

        currentImage = image

        let bigenImage = CIImage(image: currentImage)
        currentFilter.setValue(bigenImage, forKey: kCIInputImageKey)
    }

    @IBAction func changeFilter(_ sender: Any) {
    }

    @IBAction func save(_ sender: Any) {

    }
    @IBAction func intensityChanged(_ sender: Any) {
        applyProcessing()
    }

    func applyProcessing() {
        guard let image = currentFilter.outputImage else { return }
        currentFilter.setValue(Intensity, forKey: kCIInputIntensityKey)

        if let cgImage = context.createCGImage(image, from: image.extent) {
            let processedImage = UIImage(cgImage: cgImage)
            imageView.image = processedImage
        }
    }
}

Thank you @ygeras

I forgot use values in the Intensity instance.