截取屏幕的一种方法

 void Start()
    {
        StartCoroutine(ScreenShot(new Rect(0, 0, Screen.width, Screen.height)));
    }
   IEnumerator ScreenShot(Rect rect)
    {


        yield return new WaitForEndOfFrame();
        Texture2D shot = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);


        shot.ReadPixels(rect, 0,0);


        shot.Apply();



        byte []  bytes=shot.EncodeToPNG();
        string filName=Application.dataPath+"/ss.png";
        System.IO.File.WriteAllBytes(filName,bytes);
    }