Unity粒子系统Particle System

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using UnityEngine;
using System.Collections;
using System;
public class test : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValue = 1.0F;
    public float ss = 10f;
    void Start()
    {
        ps = gameObject.GetComponentInChildren<ParticleSystem>();
    }

    void Update()
    {
        var main = ps.main;
        ParticleSystem.MinMaxCurve minMaxCurve=main.startLifetime;
        float tmp = 0f;
        switch (minMaxCurve.mode)
        {
            case ParticleSystemCurveMode.Constant:
                 tmp=minMaxCurve.constant;
                break;
            case ParticleSystemCurveMode.TwoConstants:
                tmp = (minMaxCurve.constantMax > minMaxCurve.constantMin)?minMaxCurve.constantMax:minMaxCurve.constantMin;
                break;
        }
        Debug.Log(tmp);
    }

    void OnGUI()
    {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 45, 100, 30), hSliderValue, 0.0F, 5.0F);
    }
}