APPNAME是用优化编译的——步进可能表现得很奇怪；变量可能不可用

该项目在Unity3d中开发，并将其构建到iOS。

这是我的.cs文件。

IEnumerator DownloadModel(string modelUrl)
    {
        isDownloading = true;
        // Wait for the Caching system to be ready
        while (!Caching.ready)
            yield return null;
        // Load the AssetBundle file from Cache if it exists with the same version or download and store it in the cache
        WWW www = WWW.LoadFromCacheOrDownload (modelUrl, 1);
        Debug.Log ("modelURL : " + modelUrl);
        while (!www.isDone) {
            progressText.text = "Progress : " + (www.progress * 100).ToString ("N0") + "%";
            Debug.Log("Download Progress : " + (www.progress * 100).ToString ("N0") + "%");
            yield return null;
        }
        yield return www;  
        isDownloading = false;
        if (www.error != null) {
            throw new UnityException ("WWW download had an error:" + www.error);
        }
        AssetBundle bundle = www.assetBundle;
        downloadedObjectContainer = bundle.LoadAllAssets ();
        //              tempObj = Instantiate(downloadedObjectContainer[0]) as GameObject;
        //
        //              tempObj.transform.SetParent(this.transform);
        isDownloading = false;
        // Unload the AssetBundles compressed contents to conserve memory
        bundle.Unload (false);
        // memory is freed from the web stream (www.Dispose() gets called implicitly)
        Debug.LogWarning ("START CALLING OUT OBJECT");
        if (downloadedObjectContainer[0] != null) {
            Debug.Log("Downloadable content count : " + downloadedObjectContainer.Length );
            currentDownloadedModel = Instantiate(downloadedObjectContainer[0]) as GameObject;
            Debug.Log("OBJECT INSTANTIATE.");
            currentDownloadedModel.transform.SetParent(this.transform);
            //set the ARContent and ImageTarget
            sic.setARContentAndMarker(currentDownloadedModel, ImageTarget);
            Debug.Log("CONTENT MARKER SET.");
            currentDownloadedModel.SetActive(true);
        }
        Debug.LogWarning ("COROUTINE FINISHED");
    }

我的"currentDownloadedModel"在顶部被声明为GameObject。

public class cloudTrackableEventHandler : MonoBehaviour{
     GameObject currentDownloadedModel;

当我将我的应用程序构建到Android时，根本没有问题。但一旦我在iOS中构建它，这个错误就会发生

START CALLING OUT OBJECT
(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 64)
Downloadable content count : 1
(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 64)
MarcV2 was compiled with optimization - stepping may behave oddly; variables may not be available.

通过Debug.Log（），我发现当我想用我实例化的模型分配currentDownloadedModel时会出现问题。有人能帮我吗？提前谢谢。

注意：unity播放器设置中的"脚本调用优化"设置为"缓慢且安全"