Created by CyanHall.com on 12/23/2020 , Last updated: 01/08/2021.
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    let step: Float = 5
@IBAction func sliderValueChanged(sender: UISlider) {
  let roundedValue = round(sender.value / step) * step
  sender.value = roundedValue
  // Do something else with the value
}
  
From StackOverflow: UISlider with increments of 5
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