public float fillAmount ;

Description

Amount of the Image shown when the Image.type is set to Image.Type.Filled.

0-1 range with 0 being nothing shown, and 1 being the full Image.

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // Required when Using UI elements.

public class Cooldown : MonoBehaviour { public Image cooldown; public bool coolingDown; public float waitTime = 30.0f;

// Update is called once per frame void Update() { if (coolingDown == true) { //Reduce fill amount over 30 seconds cooldown.fillAmount -= 1.0f / waitTime * Time.deltaTime; } } }