//minimum-work timer that calls a function when it is done

//Just drag the script onto an object and call its StartTimer()

//You can also stop the timer early by calling CancelTimer()

​

using UnityEngine;

using UnityEngine.Events;

​

public class Timer : MonoBehaviour

{

    public float timeRemaining = 10;

    public bool timerIsRunning = false;

​

    UnityAction callWhenDone;

​

    private void Start()

    {

        // Starts the timer automatically

        timerIsRunning = true;

    }

​

    void Update()

    {

        if (timerIsRunning)

        {

            if (timeRemaining > 0)

            {

                timeRemaining -= Time.deltaTime;

            }

​

            else

            {

                Debug.Log("Time has run out!");

                timeRemaining = 0;

                timerIsRunning = false;

                callWhenDone?.Invoke();

            }

        }

    }

​

    public void StartTimer(float timeOnTimer, UnityAction whenDone = null)

    {

        print("start timer");

        timeRemaining = timeOnTimer;

        timerIsRunning = true;

        callWhenDone = whenDone;

    }

​

    public void CancelTimer()

    {

        timeRemaining = 0;

        timerIsRunning = false;

        callWhenDone = null;

    }

}