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UISlider ignores starting value

I have a weird behavior from my UISlider. I set it's initial Value and all looks fine in the Interface Builder. But it is ignored when a screen with it appears and my slider starts from a left position . I tried to place a few breakpoints but I can't find anything about it in the debug area. Any advice how to fix or debug it?

enter image description here

Solution

  • Create a IBOutlet like you did for the label and name it durationSlider. Then set the initial values in the viewDidLoad function:

    let duration: Float = 5

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    durationSlider.minimumValue = 0
    durationSlider.maximumValue = duration
    durationSlider.value = 3    // set your startValue here
    
    updateSliderLabel()
}

@IBAction func durationSliderChanged(_ sender: Any) {
    print("currentValue: \(durationSlider.value)")
    updateSliderLabel()
}

func updateSliderLabel() {
    durationLabel.text = String(round(durationSlider.value)) + "s"
}