iOS how to make slider stop at discrete points

Question

I would like to make a slider stop at discrete points that represent integers on a timeline. What\'s the best way to do this? I don\'t want any values in between. It woul

Answer 1

Swift version with ValueChanged and TouchUpInside.

EDIT: Actually you should hook up 3 events in this case:

yourSlider.addTarget(self, action: #selector(presetNumberSliderTouchUp), for: [.touchUpInside, .touchUpOutside, .touchCancel])

I've just pasted my code, but you can easily see how it's done.

private func setSizesSliderValue(pn: Int, slider: UISlider, setSliderValue: Bool)
{
    if setSliderValue
    {
        slider.setValue(Float(pn), animated: true)
    }

    masterPresetInfoLabel.text = String(
        format: TexturingViewController.createAndSendPresetNumberNofiticationTemplate,
        self.currentPresetNumber.name.uppercased(),
        String(self.currentPresetNumber.currentUserIndexHumanFriendly)
    )
}

@objc func presetNumberSliderTouchUp(_ sender: Any)
{
    guard let slider = sender as? NormalSlider else{
        return
    }

    setupSliderChangedValuesGeneric(slider: slider, setSliderValue: true)
}

private func setupSliderChangedValuesGeneric(slider: NormalSlider, setSliderValue: Bool)
{
    let rounded = roundf((Float(slider.value) / Float(presetNumberStep))) * Float(presetNumberStep)

    // Set new preset number value
    self.currentPresetNumber.current = Int(rounded)
    setSizesSliderValue(pn: Int(rounded), slider: slider, setSliderValue: setSliderValue)
}

@IBAction func presetNumberChanged(_ sender: Any)
{
    guard let slider = sender as? NormalSlider else{
        return
    }

    setupSliderChangedValuesGeneric(slider: slider, setSliderValue: false)
}