我拿到了userinfo.avatarUrl,然后用的unity下载下来，对其赋值，就是无法显示。

Unity的代码:

    IEnumerator LoadTextureFromInternet(string path)

    {

        Texture2D pic = new Texture2D(100, 100);

        UnityWebRequest request = new UnityWebRequest(path);

        //给request的downloadhandle赋值，new出来的UnityWebRequest不附加downloadhandle

        //数据，不赋值的话访问不到下载出来的数据

        DownloadHandlerTexture texture = new DownloadHandlerTexture(true);

        request.downloadHandler = texture;

        yield return request.SendWebRequest();

        if (string.IsNullOrEmpty(request.error))

        {

            pic = texture.texture;

        }

        Sprite sp = Sprite.Create((Texture2D)pic, new Rect(0, 0, pic.width, pic.height), Vector2.zero);

        touxiang.sprite = sp;

        Debug.Log("图像设置完毕!");

    }