Unity声明周期 AND 事件监听方法

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public class FPSShow : MonoBehaviour
{
    public float updateInterval = 0.5f;
    private float accum = 0;
    private int frames = 0;
    private float timeleft;
    private string stringFps;

    void Start()
    {
        timeleft = updateInterval;
    }

    void Update()
    {
        timeleft -= Time.deltaTime;
        accum += Time.timeScale / Time.deltaTime;
        ++frames;
        if (timeleft <= 0.0)
        {
            float fps = accum / frames;
            string format = System.String.Format("{0:F2} FPS", fps);
            stringFps = format;
            timeleft = updateInterval;
            accum = 0.0F;
            frames = 0;
        }
    }

    private void OnGUI()
    {
        GUIStyle guiStyle = GUIStyle.none;
        guiStyle.fontSize = 30;
        guiStyle.normal.textColor = Color.red;
        guiStyle.alignment = TextAnchor.UpperLeft;
        Rect rt = new Rect(40, 0, 100, 100);
        GUI.Label(rt, stringFps, guiStyle);

        //Application.targetFrameRate = 30; //强制设置FPS最高30帧
    }
}