UISlider that snaps to a fixed number of steps (like Text Size in the iOS 7 Settings app)

Question

I\'m trying to create a UISlider that lets you choose from an array of numbers. Each slider position should be equidistant and the slider should snap to each po

Answer 1

This worked for my particular case, using @IBDesignable:

Requires even, integer intervals:

@IBDesignable
class SnappableSlider: UISlider {

    @IBInspectable
    var interval: Int = 1

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

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

    private func setUpSlider() {
        addTarget(self, action: #selector(handleValueChange(sender:)), for: .valueChanged)
    }

    @objc func handleValueChange(sender: UISlider) {
        let newValue =  (sender.value / Float(interval)).rounded() * Float(interval)
        setValue(Float(newValue), animated: false)
    }
}