Code reacting to a slider change with quantised steps

onThicknesssliderChanged.swift

    @IBAction public func onThicknesssliderChanged(_ sender: UISlider)  {
        let step: Float = 0.25 // using 0.1 causes text render backwards & slanted! Very weird SKLabel internal bug
        let roundedValue = roundf(sender.value / step) * step
        sender.value = roundedValue  // force it to jump in increments
        updatePreviewFromThicknessChange()
    }