Unity3D StartCoroutine调用一个函数,该函数什么时候返回？

Question

我知道Unity3D StartCoroutine调用一个与StartCoroutine在同一个线程上运行的函数,但被调用的函数何时返回原始调用者？

Answer 1

我环顾互联网寻找一个很好的Unity3D Coroutine示例,却找不到完整的示例.UnityGems 有一个很好的解释,但即使他们的例子也不完整.所以我写了自己的例子.

这个:

using UnityEngine;
using System.Collections;
public class MainCamera: MonoBehaviour {
  void Start () {
    Debug.Log ("About to StartCoroutine");
    StartCoroutine(TestCoroutine());
    Debug.Log ("Back from StartCoroutine");
  }
  IEnumerator TestCoroutine(){
    Debug.Log ("about to yield return WaitForSeconds(1)");
    yield return new WaitForSeconds(1);
    Debug.Log ("Just waited 1 second");
    yield return new WaitForSeconds(1);
    Debug.Log ("Just waited another second");
    yield break;
    Debug.Log ("You'll never see this"); // produces a dead code warning
  }
}

生成此输出:

About to StartCoroutine
about to yield return WaitForSeconds(1)
Back from StartCoroutine
Just waited 1 second
Just waited another second