(Swift) Prevent app doing anything while sliding

I have a slider below webView. What will be shown on the webView depends on slider's value.
I am sliding and it works OK. I want to prevent my app, or more precisely my webView, doing anything while my finger is on slider(while I am moving a slider's circle). Then, after I finish sliding(remove my finger out of the slider's circle), app/webView should be able to do other things. Is this possible?

@IBAction func sliderButton(_ sender: Any) {  
    loadWebView()      
}

sliderButton() method triggers when user is sliding, but I want loadWebView() method to be called only after user stops sliding.

For slider, you can do something like this,

sliderButton.addTarget(self, action: #selector(onSliderValChanged(slider:event:)), for: .valueChanged)

@objc func onSliderValChanged(slider: UISlider, event: UIEvent) {
        if let touchEvent = event.allTouches?.first {
            switch touchEvent.phase {
            case .began:
            // handle drag began
                print("handle drag began")
                break
            case .moved:
            // handle drag moved
                print("handle drag moved")
                break
            case .ended:
            // handle drag ended
                print("handle drag ended")

                //do for `WKWebView`'s user interaction

                break
            default:
                break
            }
        }
    }