Unity3d - wait for a list of WWW's to finish downloading, checking in intervals and reporting progress to console for large files.

WaitForDownloads

    IEnumerator _WaitForAllDownloadsToFinish(List<WWW> wwws, float checkInterval = 1f, string helperName = "")
    {
        yield return new WaitForEndOfFrame(); //start checking next frame, to let the downloads start
        while (true)
        {
            var done = true;
            foreach (var r in wwws)
            {
                done = done & r.isDone;
                if (r.error != null)
                {
                    Debug.Log(r.error);
                }
                if (!r.isDone && SpamLogs)
                {
                    Debug.Log("Downloading: " + r.progress + " " + r.url);
                }
            }
            yield return new WaitForSeconds(checkInterval);
            if (done)
                break;
        }

        Debug.Log(Helpers.TimeStamp() + helperName + " cache is up to date");
    }