unity实现物体延时出现

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
//一个隐藏的物体等待t秒后显示，updata计时器实现
public class activeShow : MonoBehaviour {
 
 public GameObject cube;
 public int t;
 private float m_timer=0;
 
 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 m_timer+=Time.deltaTime;
 if(m_timer>5){
  cube.SetActive(true);
  m_timer=0;
 }
 }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
一个隐藏的物体等待t秒后显示，Invoke实现
public class ShowT : MonoBehaviour {
 
 public GameObject cube;
 public int t;//等待时间
 
 // Use this for initialization
 void Start () {
 Invoke("ActiveShow", t);
 }
 
 // Update is called once per frame
 void Update () {
 
 }
 
 public void ActiveShow(){
 cube.SetActive(true);
 }
}

void Start () {
 InvokeRepeating("ActiveShow", t,1000);
 }

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
//一个隐藏的物体等待t秒后显示，协程实现
public class HideInSeconds : MonoBehaviour {
 
 public GameObject cube;
 IEnumerator ie;
 
 // Use this for initialization
 void Start () {
 ie=waitFourSeconds();
 StartCoroutine(ie);
 
 }
 
 // Update is called once per frame
 void Update () {
 
 }
 
 IEnumerator waitFourSeconds(){
 yield return new WaitForSeconds(4.0f);
 cube.SetActive(true);
 }
}