Determine when NSSlider knob is 'let go' in continuous mode

Question

I\'m using an NSSlider control, and I\'ve configured it to use continuous mode so that I can continually update an NSTextField with the current value of the slider while the

Answer 1

Took me a little while to find this thread, but the accepted answer (although old) is great for detecting NSSlider state changes (slider value stopped changing being the main one I was looking for)!

Answer in Swift (Swift 4.1):

let slider = NSSlider(value: 1,
                      minValue: 0,
                      maxValue: 4,
                      target: self,
                      action: #selector(sliderValueChanged(sender:)))

. . .

@objc func sliderValueChanged(sender: Any) {

    guard let slider = sender as? NSSlider, 
          let event = NSApplication.shared.currentEvent else { return }

    switch event.type {
    case .leftMouseDown, .rightMouseDown:
        print("slider value started changing")
    case .leftMouseUp, .rightMouseUp:
        print("slider value stopped changing: \(slider.doubleValue)")
    case .leftMouseDragged, .rightMouseDragged:
        print("slider value changed: \(slider.doubleValue)")
    default:
        break
    }
}

Note: the right event types account for someone who has reversed their mouse buttons