Unity通过Url抓取网络图片

先上最开始我犯错的版本

IEnumerator DownSprites(string url, Sprite sp)
    {
        using (UnityWebRequest request = new UnityWebRequest(url))
        {
            DownloadHandlerTexture texDl = new DownloadHandlerTexture(true);
            request.downloadHandler = texDl;
            yield return request.SendWebRequest();
            if (request.isNetworkError)
            {
                Debug.LogError(request.error);
            }
            else
            {
                Texture2D tex = texDl.texture;
                tex.width = 100;
                tex.height = 100;
                Sprite sprite=Sprite.Create(tex, new Rect(0.0f, 0.0f, tex.width,tex.height), new Vector2(0.5f, 0.5f));
            }
        }
    }

上面这个是我直接把接收的图片的sprite传给需要改变图片的sprite，这样做运行的时候图片会没有任何变化。因为sprite是一个组件下面的变量，只有直接传递需要改变的组件，然后给该组件赋值才能传递成功。如下：

IEnumerator DownSprite(string url, RawImage rawImage)
    {
        using (UnityWebRequest request = new UnityWebRequest(url))
        {
            DownloadHandlerTexture texDl = new DownloadHandlerTexture(true);
            request.downloadHandler = texDl;
            yield return request.SendWebRequest();
            if (request.isNetworkError)
            {
                Debug.LogError(request.error);
            }
            else
            {
                rawImage.texture = texDl.texture;
            }
        }
    }