public float lifetimeMultiplier;

Description

Change the lifetime multiplier.

This is more efficient than accessing the whole curve, if you only want to change the overall lifetime multiplier.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValueLifetime = 1.0f;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();

        var main = ps.main;
        main.startColor = new ParticleSystem.MinMaxGradient(Color.red, Color.yellow);
        main.startSize = 0.1f;
        main.startLifetime = 1.5f;

        var trails = ps.trails;
        trails.enabled = true;

        var psr = GetComponent<ParticleSystemRenderer>();
        psr.trailMaterial = new Material(Shader.Find("Sprites/Default"));
    }

    void Update()
    {
        var trails = ps.trails;
        trails.lifetimeMultiplier = hSliderValueLifetime;
    }

    void OnGUI()
    {
        GUI.Label(new Rect(25, 40, 100, 30), "Lifetime");

        hSliderValueLifetime = GUI.HorizontalSlider(new Rect(95, 45, 100, 30), hSliderValueLifetime, 0.0f, 1.0f);
    }
}

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Scripting API

ParticleSystem.TrailModule.lifetimeMultiplier

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