while循环后Unity3d协程停止

问题描述

我让一个Singleton LevelManager加载一个关卡，等待新加载的关卡中的脚本将GameObject分配给LevelManager，然后对其进行处理.

I have a singleton LevelManager loading a level, waiting for a script from the newly-loaded level to assign a GameObject to the LevelManager to then do stuff with it.

我有以下代码:

// some GameObject calls the loadLevel coroutine
void somefunction(sceneToLoad){
    StartCoroutine(LevelManager.Instance.loadLevel (sceneToLoad));
}

// snippet of LevelManager.cs
public GameObject levelPrepper = null;
public IEnumerator loadLevel(string levelName){
    Application.LoadLevel (levelName);
    while (!levelPrepper)
        yield return null;
    yield return StartCoroutine (waitForLevelPrepper());
    print("yay");
    //do stuff
}

//snippet of the levelPrep.cs:
void Awake(){
    LevelManager.Instance.levelPrepper = gameobject;
}

问题在于，"yay"永远不会被打印出来.

The problem is that "yay" never gets printed.

我已经读过一些书，发现当携带协程的GameObject被销毁时，可能会发生这种情况.但是，LevelManager绝对不会在此过程中被破坏，所以我很茫然.

I've done some reading and found that this might happen when the GameObject carrying the coroutine is destroyed. However, LevelManager is definitely never destroyed during the process, so I'm at a loss.

推荐答案

问题是，您不是在LevelManager上而是在某些gameObject"上启动协程，很可能将其销毁，并且协程将停止执行.

The issue is that you start the Coroutine not on the LevelManager, but on "some gameObject", that most likely will be destroyed and its coroutine will stop being executed.

您可以通过将调用StartCoroutine移至新方法中来解决此问题，如下所示:

You could fix that by moving the call StartCoroutine into a new method, like this :

void somefunction(sceneToLoad)
{
    LevelManager.Instance.LoadLevel(sceneToLoad));
}


public class LevelManager
{
    public void LoadLevel(string levelName)
    {
        StartCoroutine(LoadLevelCoroutine);
    }

    private GameObject levelPrepper = null;
    private IEnumerator LoadLevelCoroutine(string levelName){
        Application.LoadLevel (levelName);
        while (!levelPrepper)
            yield return null;
        yield return StartCoroutine (waitForLevelPrepper());
        print("yay");
        //do stuff
    }
}

或直接调用LevelManager的StartCoroutine

or calling the StartCoroutine of LevelManager directly

void somefunction(sceneToLoad){
    LevelManager.Instance.StartCoroutine(LevelManager.Instance.loadLevel(sceneToLoad));
}

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