unity之使用协程异步加载场景

public class UnityScriptManage : MonoBehaviour
{
public void CallCoroutine(IEnumerator routine)
{
StartCoroutine(routine);
}
}

public class Test
{

public void LoadScene(LoadSceneMode mode)
{
//调用了UnityScriptManage中的CallCoroutine
GlobalComManage.Instance.UnityScript.CallCoroutine(LoadAsync(mode));
}

//调用此接口，执行了一次yield return async之后就不执行了。且async.progress输出为0
private IEnumerator LoadAsync(LoadSceneMode mode)
{
async = SceneManager.LoadSceneAsync(sceneName, mode);
async.allowSceneActivation = false;
while (!async.isDone && async.progress < 0.8f)
{
yield return async;
}
}
//调用此接口，协程正常调用，但是由于async.allowSceneActivation设置为false所以scene.isLoaded状态一直为false，且由于async.allowSceneActivation设置为false之后，async.progress最后一直停留在0.9。
private IEnumerator LoadAsync(LoadSceneMode mode)
{
async = SceneManager.LoadSceneAsync(sceneName, mode);
Scene scene = SceneManager.GetSceneByName(sceneName);
async.allowSceneActivation = false;
while (!scene.isLoaded)
{
yield return null;
}
async.allowSceneActivation = true;
async = null;
}
}

public class UnityScriptManage : MonoBehaviour
{
public void CallCoroutine(IEnumerator routine)
{
StartCoroutine(routine);
}
}

public class Test
{

public void LoadScene(LoadSceneMode mode)
{
GlobalComManage.Instance.UnityScript.CallCoroutine(LoadAsync(mode));
}
private IEnumerator LoadAsync(LoadSceneMode mode)
{
async = SceneManager.LoadSceneAsync(sceneName, mode);
async.allowSceneActivation = false;
while (!async.isDone && async.progress < 0.8f)
{
yield return async;
}
}
private IEnumerator LoadAsync(LoadSceneMode mode)
{
async = SceneManager.LoadSceneAsync(sceneName, mode);
Scene scene = SceneManager.GetSceneByName(sceneName);
async.allowSceneActivation = false;
while (async.progress < 0.9f)
{
yield return null;
}
async.allowSceneActivation = true;
while(!scene.isLoaded)
{
yield return null;
}
async = null;
}
}