var tex = DownloadSync("file://" + path).texture; 这句话报错请更正

抱歉，我再次犯了错误。在 IEnumerator 函数中，不能直接访问 UnityWebRequest 中的 texture 属性，因为 UnityWebRequest 并没有这个属性。可以使用 DownloadHandlerTexture 类来处理下载的纹理，并将其作为 UnityWebRequest 的结果返回。因此，需要将代码中的这一行：

var tex = DownloadSync("file://" + path).texture;

改为：

var tex = DownloadSync("file://" + path);
yield return tex;
var texture = DownloadHandlerTexture.GetContent(www);

然后，将 DownloadSync 函数中的这一行：

yield return www;

改为：

yield return new DownloadHandlerTexture();

以下是更正后的代码：

public void ReplaceIMG(RawImage _rawImg, string path)
{
    print("ReplaceIMGwww");
    try
    {
        var tex = DownloadSync("file://" + path);
        yield return tex;
        var texture = DownloadHandlerTexture.GetContent(tex);
        if (texture == null)
            return;
        texture.wrapMode = TextureWrapMode.Clamp;
        float width = texture.width;
        float height = texture.height;
        _rawImg.texture = texture;
        _rawImg.SetNativeSize();
        texture = null;
    }
    catch (Exception e)
    {
        Debug.Log(e.Message);
    }
}

public static IEnumerator DownloadSync(string path, WWWForm form = null)
{
    UnityWebRequest www;
    if (form != null)
        www = UnityWebRequest.Post(path, form);
    else
        www = UnityWebRequest.Get(path);
    www.downloadHandler = new DownloadHandlerTexture();
    www.SendWebRequest();
    yield return YieldToStop(www);
}

private static object YieldToStop(UnityWebRequest www)
{
    var @enum = DownloadEnumerator(www);
    while (@enum.MoveNext()) ;
    return @enum.Current;
}

private static IEnumerator DownloadEnumerator(UnityWebRequest www)
{
    while (!www.isDone)
    {
        yield return null;
    }
    yield return www;
}

再次感谢您的耐心和理解。