let slider   = MultiSlider()
slider.minimumValue = 1    // default is 0.0
slider.maximumValue = 5    // default is 1.0

slider.value = [1, 4.5, 5]

slider.addTarget(self, action: #selector(sliderChanged(_:)), forControlEvents: .valueChanged) // continuous changes
slider.addTarget(self, action: #selector(sliderDragEnded(_:)), forControlEvents: . touchUpInside) // sent when drag ends

func sliderChanged(slider: MultiSlider) {
    print("\(slider.value)") // e.g., [1.0, 4.5, 5.0]
}

slider.outerTrackColor = .lightGray // outside of first and last thumbs

slider.orientation = .horizontal // default is .vertical

slider.valueLabelPosition = .left // .notAnAttribute = don't show labels
slider.isValueLabelRelative = true // show differences between thumbs instead of absolute values
slider.valueLabelFormatter.positiveSuffix= " 𝞵s"

slider.snapStepSize = 0.5  // default is 0.0, i.e. don't snap

slider.tintColor = .cyan // color of track
slider.trackWidth = 32
slider.hasRoundTrackEnds = true
slider.showsThumbImageShadow = false // wide tracks look better without thumb shadow

slider.thumbImage   = UIImage(named: "balloon")
slider.minimumImage = UIImage(named: "clown")
slider.maximumImage = UIImage(named: "cloud")

slider.disabledThumbIndices = [1, 3]