在嵌套协程中挣扎着从 while 循环返回数据

问：

这是我在stackOverflow上发布的第一个问题！我正在尝试为 Unity 游戏开发 AssetBundle 更新程序。我用于确保一个操作在下一个操作开始之前完成。yield return StartCoroutine()

我正在尝试做的是显示下载的文件在 Textmesh 对象上下载时的百分比。

这是代码。 本身就是从另一个脚本启动的协程。DownloadCoroutineLauncher()

public IEnumerator DownloadCoroutineLauncher(){
        yield return StartCoroutine(InitialSetup());
        //Ensures that we have the correct local file structure.
        yield return StartCoroutine(EnsureFileStructureAndInitialVersionDoc());
        //Just tells us which files to get from remote.
        yield return StartCoroutine(EnsureCorrectPlatform());
        yield return StartCoroutine(FinalizeInitialSetup());
        //At this point we should at the very least have an initial version file.
        //Set up the local version dictionary.
        yield return StartCoroutine(LocalDictionarySetup());
        //Download the version file and set up the remote version dictionary.
        yield return StartCoroutine(DownloadVersionFile());
        //Figure out what new files need to be downloaded or overwritten.
        yield return StartCoroutine(FigureOutWhatToUpdate());
        //Determine files needing deletion.
        yield return StartCoroutine(FigureOutWhatToDelete());
        //Download what needs downloading.
        foreach(KeyValuePair<string,bool> file in whatToUpdate){
            if(file.Value == true){
                yield return StartCoroutine(DownloadAssetBundle(localFiles[file.Key],remoteFiles[file.Key],"Downloading " + file.Key));
            }
        }
        /*Delete what needs deleting. Future Feature.
        foreach(KeyValuePair<string,string> file in whatToDelete){

        }*/
        //Finally, update the local version doc
        yield return StartCoroutine(UpdateVersionDoc());
        yield return null;

    }

问题出在 DownloadAssetBundle 协程内部。

    IEnumerator DownloadAssetBundle(string localLocation, string remoteLocation, string niceText){
        yield return CurrentItemText.text = niceText; //This returns and updates the TMP text correctly.
        var cert = new ForceAcceptAll();
        UnityWebRequest request = new UnityWebRequest(remoteLocation,UnityWebRequest.kHttpVerbGET);
        request.certificateHandler = cert;
        request.downloadHandler = new DownloadHandlerFile(localLocation);
        yield return request.SendWebRequest();
        cert?.Dispose();
        while (!request.isDone){
            Debug.Log((request.downloadProgress * 100.0f).ToString() + "%"); //troubleshooting line. Also doesn't trigger.
            ProgressText.text = (request.downloadProgress * 100.0f).ToString() + "%";
            yield return ProgressText; //This does not update as expected.

        }
        yield return null;
    }

发生的情况是，当前项目标签在适当的时间正确更新，但其中的任何内容都不会按预期更新。我能做些什么来使我的小百分比跟踪器对象按照我想要的方式随着每一帧而更新？谢谢！while(!request.isDone)