[英]OnMouseDown() null reference exception
public class TowerNode : MonoBehaviour {
public bool IsShopOpen=false;
//Z position
public Vector3 positionOffSet;
//colors
public Color hoverColor;
private Color startColor;
//GameObjects
public GameObject turret;
//shop
public Shop shop;
//Build Manager
BuildManager buildManager;
void Start()
{
rend=GetComponent<Renderer>();
startColor = rend.material.color;
buildManager = BuildManager.instance;
shop = GetComponent<Shop>();
}
//When mouse is on the turret node
public void OnMouseDown()
{
Debug.Log("Mouse is Down");
bool IsShopOpen = true;
if (IsShopOpen == true)
{
Debug.Log("shop is open");
shop.onEnable();
}
if (EventSystem.current.IsPointerOverGameObject())
{
return;
}
if (!buildManager.CanBuild)
{
return;
}
if (turret != null)
{
Debug.Log("Cant Build Here!!!");
return;
}
buildManager.BuildTurretOn(this);
}
商店的另一个脚本是这样的:
public class Shop : MonoBehaviour
{
public TurretBlueprint Archery;
public TurretBlueprint Treb;
public TurretBlueprint Workamp;
public TurretBlueprint Barracks;
public Button Archeryy;
public Button Trebb;
public Button WorkCampp;
public Button Barrackss;
BuildManager buildManager;
void Start()
{
buildManager = BuildManager.instance;
disableAllButtons();
//OnEnable();
}
public void SelectArchery()
{
buildManager.SelectTurretToBuild(Archery);
Debug.Log("archery!!!!");
}
public void SelectTreb()
{
buildManager.SelectTurretToBuild(Treb);
Debug.Log("Treb!!!!");
}
public void SelectWorkamp()
{
buildManager.SelectTurretToBuild(Workamp);
Debug.Log("Work Camp!!!!");
}
public void SelectBarracks()
{
buildManager.SelectTurretToBuild(Barracks);
Debug.Log("Barracks!!!!");
}
public void onEnable()
{
Archeryy.gameObject.SetActive(true);
Trebb.gameObject.SetActive(true);
WorkCampp.gameObject.SetActive(true);
Barrackss.gameObject.SetActive(true);
}
public void disableAllButtons()
{
Archeryy.gameObject.SetActive(false);
Trebb.gameObject.SetActive(false);
WorkCampp.gameObject.SetActive(false);
Barrackss.gameObject.SetActive(false);
}
}
当我单击游戏对象时,我需要商店将打开sop,但它下面没有几个按钮,但是它给了我:
“ NullReferenceException:对象引用未设置为对象TowerNode.OnMouseDown()的实例(在Assets / Scripts / TowerNode.cs:51处)UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32)”
我不明白为什么。
您得到的错误暗示在执行时OnMouseDown
函数中的对象为null:
NullReferenceException:对象引用未设置为对象TowerNode.OnMouseDown()的实例(在Assets / Scripts / TowerNode.cs:51处)
您应该查看TowerNode.cs
ine 51,并确定该行上可以为空的内容。 shop
或buildManager
可以为null? 在初始化TowerNode
对象之前,可能会触发此事件。
看来您正在尝试从完全不相关的GameObject访问组件( Shop
)。 如果您希望所有的TowerNode
对象都引用Shop
则可以使用GameObject.Find 。 不过,实际上并不建议这样做; 似乎有一种更好的方式链接这两个对象,但是我不确定您的用例。
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