1

I can find numerous tutorials online about how to make a simple countdown timer in Unity, but none about how to subtract time from it if you press a button.

I am making a 2-D platformer game where if your character passes in front of an NPC, it brings up dialog. I want to make so that one option of dialog does nothing to the timer, but the other option will subtract 10 seconds from the timer. How do I do this?

2

private float timer;
private Button targetButton;

void Awake ()
{
    timer = 50f;

    // this line below only in case if you don't assign the SubtractTime method
    // to button from inspector otherwise comment this line
    targetButton.onClick.AddListener( () => SubtractTime() );
}

void Update ()
{
    timer -= Time.deltaTime;
}

// Add this function to a button's onClick event
public void SubtractTime ()
{
    timer -= 10f;
}