unity 按下按鈕實現UI顯示與隱藏

void Update()
    {
        if(Input.GetKeyUp(KeyCode.D))
        {
            flag = !flag;
        }
        if (flag)
        {
            open_txt_btn.GetComponent<CanvasGroup>().alpha = 1;
        }
        else
        {
            open_txt_btn.GetComponent<CanvasGroup>().alpha = 0;
        }
}

 

給UI組件加Canvas Group，Alpha為1顯示，為0隱藏