通过yield return 嵌套，子协程执行完之后父进程才继续执行

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using System.Collections;
using UnityEngine;
 
public class test2 : MonoBehaviour {
 
 
	void Start () {
        Debug.Log("Start0");
        StartCoroutine(test());
        Debug.Log("Start1");
    }
 
    IEnumerator test()
    {
 
        Debug.Log("test0");
        yield return StartCoroutine(testzz());
        Debug.Log("test1");
 
    }
    IEnumerator testzz()
    {
        for (int i = 0; i < 5; i++)
        {
            Debug.Log("test2222");
            yield return null;
        }
 
 
    }
}

运行顺序

不使用Yield Return，父协程会先执行完毕

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using System.Collections;
using UnityEngine;
 
public class test2 : MonoBehaviour {
 
 
	void Start () {
        Debug.Log("Start0");
        StartCoroutine(test());
        Debug.Log("Start1");
    }
 
    IEnumerator test()
    {
 
        Debug.Log("test0");
        StartCoroutine(testzz());
        Debug.Log("test1");
        yield return null;
 
    }
    IEnumerator testzz()
    {
        for (int i = 0; i < 5; i++)
        {
            Debug.Log("test2222");
            yield return null;
        }
    }
}

执行顺序

Coroutine会在调用时直接先运行一次

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using System.Collection;
using UnityEngine;

public class CoroutineTest : MonoBehaviour
{
    Coroutine m_Coroutine;
    private void OnGUI()
    {
        if(GUILayout.Button("Start1"))
            m_Coroutine = StartCoroutine(MyTestCo());
        if(GUILayout.Button("Start2"))
            m_Coroutine = StartCoroutine(MyTestCo2());
    }
    
    IEnumerator MyTestCo()
    {
        for(int i = 0;i < 3; i++)
        {
            Debug.Log("fff");
            yield return null;
        }
    }
    IEnumerator MyTestCo2()
    {
        StopCoroutine(m_Coroutine);//在调用的当时，m_Coroutine指的是MyTestCo，所以这一句是合理的
        for(int i = 0;i < 3; i++)
        {
            Debug.Log("eee");
            yield return null;
        }
    }
}

在Coroutine内调用Time.deltatime和WaitForScends是受Timescale控制的

使用coroutine计时是可以暂停游戏的。