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Assets/Scripts/Demo/FPSCounter.cs

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+using UnityEngine;
+
+public class FPSCounter : MonoBehaviour
+{
+    private float updateInterval = 0.5f;
+    private float accum = 0f;
+    private int frames = 0;
+    private float timeleft;
+    private float fps = 0f;
+
+    private GUIStyle style;
+    private Color goodColor = Color.green;    // >60 FPS
+    private Color warnColor = Color.yellow;   // 30-60 FPS
+    private Color badColor = Color.red;      // <30 FPS
+
+    void Start()
+    {
+        timeleft = updateInterval;
+        
+        style = new GUIStyle();
+        style.alignment = TextAnchor.UpperRight;
+        style.fontSize = 20;
+    }
+
+    void Update()
+    {
+        timeleft -= Time.deltaTime;
+        accum += Time.timeScale / Time.deltaTime;
+        frames++;
+
+        if (timeleft <= 0f)
+        {
+            fps = accum / frames;
+            timeleft = updateInterval;
+            accum = 0f;
+            frames = 0;
+        }
+    }
+
+    void OnGUI()
+    {
+        // 根据FPS值设置颜色
+        if (fps > 60) style.normal.textColor = goodColor;
+        else if (fps > 30) style.normal.textColor = warnColor;
+        else style.normal.textColor = badColor;
+
+        GUI.Label(new Rect(Screen.width - 150, 10, 140, 30), 
+            $"FPS: {fps:0.}", style);
+    }
+}