我正在為我創(chuàng)建的虛擬鍵盤(pán)編寫(xiě)鍵盤(pán)管理器。我正在使用 UnityAction 返回調(diào)用對(duì)象并處理鍵盤(pán)輸入。然而，不知何故，我的 UnityAction 丟失了其訂閱的事件，我得到一個(gè)“對(duì)象引用未設(shè)置到對(duì)象實(shí)例。我檢查了調(diào)用函數(shù)，看看 UnityAction 到達(dá)腳本后是否不為空，事實(shí)并非如此。然而，檢查關(guān)閉中的其他地方都會(huì)返回 null。您將在我的所有調(diào)試代碼下面找到我檢查 UnityAction 不為空的位置。代碼中唯一不為 null 的地方是 ReadUserInput 函數(shù)。所有其他均為空。我在很多地方都使用過(guò)這種編碼方法，沒(méi)有出現(xiàn)任何問(wèn)題。不知道為什么這個(gè)這么粘！調(diào)用代碼：    VRKeyboard.ProcessInput += AddKbdInputToInputline;    VRKeyboard.ReadUserInput();VR鍵盤(pán)代碼：public TMPro.TMP_Text InputLine;public GameObject VRKeyboard;public UnityAction ProcessInput;private bool isdone = false;// Update is called once per framevoid Update(){    if (ProcessInput == null) Debug.Log("ProcessInput is null at update"); else Debug.Log("ProcessInput is NOT null at update");    if (isdone) CloseKeyboard();}public void ReadUserInput(){    InputLine.text = "";    VRKeyboard.SetActive(true);    if (ProcessInput == null) Debug.Log("ProcessInput is null at open"); else Debug.Log("ProcessInput is NOT null at open");}public void OnPointerDown(PointerEventData p){    Text ButtonPressed;    ButtonPressed = GetComponentInChildren<Text>(this);    switch (ButtonPressed.text)    {        case "Clear All":            InputLine.text = "";            break;        case "Backsp":            InputLine.text = InputLine.text.Substring(0, InputLine.text.Length - 1);            break;        case "Enter":            isdone = true;            break;       default:            InputLine.text += ButtonPressed.text;            break;    }    if (ProcessInput == null) Debug.Log("ProcessInput is null at pointerdown"); else Debug.Log("ProcessInput is NOT null at pointerdown");}public void OnPointerUp(PointerEventData p){}public void CloseKeyboard(){    GameObject VRKeyboard = transform.parent.parent.parent.gameObject;    VRKeyboard.SetActive(false);    if (ProcessInput == null) Debug.Log("ProcessInput is null at close");    //This line below is where I get the error:    ProcessInput(); }