update UI

Assets/Scenes/05.unity.meta

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Assets/Scripts/Skill.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class Skill : MonoBehaviour
+{
+    public Text text;
+    public Image image;
+
+    public float coolDown = 0f;
+    public float coolDonwTime = 10f;
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if (coolDown > 0)
+        {
+            // deltaTime 是当前Update执行和上一次Update执行的时间差
+            // 用来拟合计算现实时间，不受帧率的影响。
+            coolDown -= Time.deltaTime; 
+            text.text = coolDown.ToString("f1");
+            image.fillAmount = coolDown / coolDonwTime;
+        }
+        else
+        {
+            coolDown = 0f;
+            text.text = "";
+        }
+    }
+
+    public void UseSkill() {
+        if(coolDown > 0) { } else
+        {
+            // 释放技能，并进入冷却
+
+            /* 释放技能的代码 */
+            coolDown = coolDonwTime;
+        }
+    }
+}

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Assets/Scripts/UITest.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class UITest : MonoBehaviour
+{
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+    public void GameStart() {
+        SceneManager.LoadScene("01");
+    }
+}

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