UnityWebRequest加载Texture防止泄漏

新版本的Unity改用了UnityWebRequest来替代WWW，贴图泄漏要注意

//在旧的WWW里
//不能直接www.texture
xxx.texture = www.texture; 
//只要有www.texture就会有内存泄漏
//可以用www的LoadImageIntoTexture方法直接赋值
www.LoadImageIntoTexture(texture);

在UnityWebRequest下没有了LoadImageIntoTexture方法,可以改用DownloadHandlerTexture.GetContent();

				string path = string.Format("{0}/svg/{1}", Application.persistentDataPath,one.xml.path);
                filename = string.Format("{0}/{1}.ss", path, one.xml.svg);

                if (Application.platform == RuntimePlatform.Android)
                {
                    filename = string.Format("file://{0}", filename);
                }
                else
                {
                    filename = string.Format("file://{0}", filename);
                }
                //Debug.Log("如果有图片了." + one.xml.svg+","+ filename);
                //Debug.Log("==="+filename);
                www = UnityWebRequest.Get(filename);
                downloadTexture = new DownloadHandlerTexture(true);
                www.downloadHandler = downloadTexture;
                yield return www.SendWebRequest();
                if (www.isNetworkError || www.isHttpError)
                {
                    Debug.LogError(www.error + "," + filename);
                    one.DeleteOne();
                    continue;
                }
                if (!dictJPG.ContainsKey(one.xml.svg))
                {
                    dictJPG.Add(one.xml.svg, www);
                }
           
             
                Texture2D texture2d = DownloadHandlerTexture.GetContent(www);

                one.svgImg.texture = texture2d;

另外有一个关于加载图片的测试：
https://blog.youkuaiyun.com/thinbug/article/details/118760149?spm=1001.2014.3001.5501