Sprite.Create方法卡顿解决方案

  Sprite.Create随着图片尺寸的增大，消耗的性能越多，造成主线程卡顿，用RawImage.texture替换可解决。

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  IEnumerator LoadImg()
    {
        WWW www = new WWW(urlImg);
        while(!www.isDone)
        { 
            yield return null;
           
        }
        RawImage.texture = www.texture;      
        //Sprite sprite = Sprite.Create(tt, new Rect(0, 0, www.texture.width, www.texture.height), Vector2.zero);
    }