unity截屏

      static IEnumerator GetScreenTexture(Rect rect, Action<Texture2D> callback)
        {
            yield return new WaitForEndOfFrame();
            Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);//需要正确设置好图片保存格式
            float x = rect.x + (Screen.width - rect.width) / 2;
            float y = rect.y + (Screen.height - rect.height) / 2;
            Rect position = new Rect(x, y, rect.width, rect.height);
            screenShot.ReadPixels(position, 0, 0, false);//按照设定区域读取像素；注意是以左下角为原点读取
            screenShot.Apply();
            //二进制转换
            byte[] bytes = screenShot.EncodeToPNG();
            string filename = Application.streamingAssetsPath + "/ScreenShot.png";
            System.IO.File.WriteAllBytes(filename, bytes);
            callback?.Invoke(screenShot);
        }
        
        /// <summary>
        /// 自定义截图的大小
        /// </summary>
        /// <param name="rect"></param>
        /// <returns></returns>
        public static void CaptureScreen(Rect rect, Action<Texture2D> callBack)
        {
            GameRoot.Instance.StartCoroutine(GetScreenTexture(rect, callBack));
        }
             /// <summary>
        /// 截取屏幕全屏
        /// </summary>
        public static void CaptureScreen()
        {
            ScreenCapture.CaptureScreenshot(Application.streamingAssetsPath + "/ScreenShot.png", 0);
        }
           /// <summary>
        /// 针对指定的相机进行截屏
        /// </summary>
        /// <param name="came"></param>
        /// <param name="r"></param>
        /// <returns></returns>
        public static Texture2D CaptureScreen(Camera came, Rect r)
        {
            RenderTexture rt = new RenderTexture((int)r.width, (int)r.height, 0);

            came.targetTexture = rt;
            came.Render();

            RenderTexture.active = rt;
            Texture2D screenShot = new Texture2D((int)r.width, (int)r.height, TextureFormat.RGB24, false);

            screenShot.ReadPixels(r, 0, 0);
            screenShot.Apply();

            came.targetTexture = null;
            RenderTexture.active = null;
            GameObject.Destroy(rt);

            byte[] bytes = screenShot.EncodeToPNG();
            string filename = Application.streamingAssetsPath + "/ScreenShot.png";
            System.IO.File.WriteAllBytes(filename, bytes);

            return screenShot;
        }