Unity截取UI

 注释

unity 对某一矩形UI进行截取

    /// 

    /// 截取UI
    /// 
    /// UI（中点在最下面）
    /// 路径
    /// 
    public IEnumerator CaptureByUI(RectTransform UIRect, string mFileName)
    {
        //等待帧画面渲染结束
        yield return new WaitForEndOfFrame();

        Vector3[] corners = new Vector3[4];
        UIRect.GetWorldCorners(corners);
        float a = corners[2].x - corners[0].x;
        float b = corners[1].y - corners[0].y;
        Texture2D tex = new Texture2D((int)a, (int)b, TextureFormat.RGB24, false);
        //从屏幕读取像素, leftBtmX/leftBtnY 是读取的初始位置,width、height是读取像素的宽度和高度
        tex.ReadPixels(new Rect(corners[0].x, corners[0].y, a, b), 0, 0);
        Debug.Log(new Rect(corners[0].x, corners[0].y, a, b));
        //执行读取操作
        tex.Apply();
        rawImageIcon.texture = tex;
        byte[] bytes = tex.EncodeToPNG();
        //保存
        File.WriteAllBytes(mFileName, bytes);
        //DownLoadImg(bytes);
    }