void Awake()
    {
        _instance = this;

        _content     = transform.Find("content/Text").GetComponent <UILabel>();
        _okLabel     = transform.Find("okBtn/Text").GetComponent <UILabel>();
        _cancelLabel = transform.Find("cancelBtn/Text").GetComponent <UILabel>();

        transform.Find("okBtn").GetComponent <Button>().onClick.AddListener(OKClick);
        transform.Find("cancelBtn").GetComponent <Button>().onClick.AddListener(CancelClick);
        SetActive(this.gameObject, false);
    }
 public void Destory()
 {
     _instance = null;
     GameObject.DestroyImmediate(this.gameObject);
 }