首先我们需要一个技能图片！
然后！我们需要一个透明的图片！例如：
然后！让透明的图片遮住技能
接着把透明图片的Image属性改成如图所示
代码如下
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class skill_cd : MonoBehaviour {
Image image;
bool isstartcd = false;
public float cdtime =2;
private float timer = 0;
void Start () {
image = transform.Find ("cd_Image").GetComponent<Image> ();
}
void Update () {
if (isstartcd) {
timer += Time.deltaTime;
image.fillAmount = (cdtime - timer) / cdtime;
if (timer >= cdtime) {
timer = 0;
isstartcd = false;
}
}
}
public void OnClick(){
isstartcd = true;
}
}
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