Instantiate(GameObject) VS Resource.Load()_gameobject instantiate resources.load

问题引出

今天写Unity程序时出现以下问题，主要代码如下

void ShowMessageBox()
{
	GameObject messageBox = (GameObject)Resources.Load("Prefabs/MessageBox");
	messageBox.GetComponentInChildren<Text>().text = "The model already exists.\nCover it?";
	Instantiate(messageBoxResource);
	messageBox.GetComponent<MyMessageBox>().OkBtn.onClick.AddListener(OnOkBtnClicked);
	messageBox.GetComponent<MyMessageBox>().CancleBtn.onClick.AddListener(OnCancleBtnClicked);
}

void OnOkBtnClicked()
{
    Debug.Log("Click OK");
    DestroyImmediate(messageBox);
}

void OnCloseBtnClicked()
{
    DestroyImmediate(messageBox);
 }

void OnCancleBtnClicked()
{
    Debug.Log("Click Cancle");
    DestroyImmediate(messageBox);
}
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开始程序死活都无法响应MessageBox的OK和Cancle按钮的点击事件。鼠标滑过Instantiate时IDE提示返回GameObject，突然提醒了我Instantiate返回的才是在场景中的GameObject，Resource.Load只是将资源加载到内存当中。因此将代码改为如下：

    void