How to make a function call when a variable changes in Unity?

Question

C++ / C#

Good evening! I'm making sound settings for the game in Unity. I want to make the volume change function triggered by moving the slider (in fact, by changing the variable). How to do it?

Answer 1

If the slider is a unit slider, then it has an onValueChanged event. You subscribe to this event a method that changes the volume and that's it.
Something like this:

[SerializeField] private Slider _slider;

private void OnEnable()
{
    _slider.onValueChanged.AddListener(ChangeVolume);
}

private void OnDisable()
{
    _slider.onValueChanged.RemoveListener(ChangeVolume);
}

private void ChangeVolume(float amount)
{
    //изменить громкость на значение amount
}

Answer 2

Change the variable only in one place (in some method)
And call the desired function in it.