Simple SteppedSlider in swift. Subclass of UISlider

SteppedSlider.swift

import UIKit

@IBDesignable
class SteppedSlider: UISlider {
    @IBInspectable var stepSize: Int = 1

    @IBInspectable var normalThumbImage: UIImage? {
        get {
            return thumbImage(for: .normal)
        }
        set {
            setThumbImage(newValue, for: .normal)
        }
    }

    @IBInspectable var trackHeight: CGFloat = 12

    var valueChanged: ((Int) -> Void)?

    var ticksCount: Int {
        return Int((maximumValue - minimumValue) / Float(stepSize))
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }

    private func setup() {
        minimumValue = 0
        addTarget(self, action: #selector(sliderValueChanged(_:)), for: .valueChanged)
    }

    override func trackRect(forBounds bounds: CGRect) -> CGRect {
        var rect = super.trackRect(forBounds: bounds)
        rect.size.height = trackHeight
        return rect
    }

    @objc func sliderValueChanged(_ sender: SteppedSlider) {
        let value = Int(sender.value / Float(sender.stepSize))
        sender.setValue(Float(value), animated: !isContinuous)
        valueChanged?(value)
    }

    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        setThumbImage(normalThumbImage, for: .normal)
    }
}