unity中用按钮控制物体显示隐藏，为什么我的隐藏后显示不了？

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class ShowModel : MonoBehaviour
{

    void Start()
    {
        transform.gameObject.SetActive(false);//控制物体隐藏
    }
    public void OnShow()
    {
        transform.gameObject.SetActive (true);
    }

}

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