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

Just found an elegant way to have a slider continuously updating a label, and storing the slider's value only when the user releases all the mouse buttons.

class YourViewController: NSViewController {
    @IBOutlet weak var slider: NSSlider!
    @IBOutlet weak var label: NSTextField!

    @objc var sliderValue = 0

    override func awakeFromNib() {
        sliderValue = 123 // init the value to whatever you like

        slider.bind(NSBindingName("value"), to: self, withKeyPath: "sliderValue")
        label.bind(NSBindingName("value"),  to: self, withKeyPath: "sliderValue")
    }

    @IBAction func sliderMoved(_ sender: NSSlider) {
        // return if a mouse button is pressed
        guard NSEvent.pressedMouseButtons == 0 else { return }

        // do something with the value
    }
}