unity 利用ugui 制作技能冷却效果

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class SkillItem : MonoBehaviour {

	//冷却时间
	public float coldTime = 2.0f;

	//定时器
	private float timer = 0f;

	//前面的一张填充图片
	private Image filedImage;

	//是否开始技能冷却
	private bool isStartTimer = false;
	// Use this for initialization
	void Start () {
		filedImage = transform.Find ("FilledImage").GetComponent<Image> ();
	}
	
	// Update is called once per frame
	void Update () {
		//已经开始冷却
		if (isStartTimer) {
			timer += Time.deltaTime;

			//计算fillAmount
			filedImage.fillAmount =	(coldTime - timer) / coldTime;
			if (timer >= coldTime) {

				//停止定时器
				filedImage.fillAmount = 0;
				timer = 0;
				isStartTimer = false;
			}
		}
	}

	public void OnClick()
	{
		isStartTimer = true;
	}
}