Question

更新

public class WaypointsClass
{
    public GameObject[] waypoints;
}


public class MoveEnemy : MonoBehaviour {

    public GameObject[] waypoints;
    private WaypointsClass wp;
    private int currentWaypoint = 0;

    void Start () {
       WaypointsClass wp = new WaypointsClass();
        wp.waypoints = new GameObject[waypoints.Length];
        wp.waypoints = waypoints;
print( wp.waypoints[currentWaypoint].transform.position); **WORKING**

}

void Update () {
print(wp.waypoints[currentWaypoint].transform.position);  **NOT WORKING**
}

Answer 1

非常接近这个

public class WaypointsClass
{
    public GameObject[] waypoints;
}

WaypointsClass.waypoints是 ARRAY ！您必须使用new关键字创建数组或类似的内容。 wp.waypoints = new GameObject[waypoints.Length];

应该看起来像这样

public class MoveEnemy : MonoBehaviour {

    public GameObject[] waypoints;
    private WaypointsClass wp;
    private int currentWaypoint = 0;

    void Start () {
        WaypointsClass wp = new WaypointsClass();
        wp.waypoints = new GameObject[waypoints.Length]; //This line you missed
        wp.waypoints = waypoints;
        Vector3 startPosition = wp.waypoints[currentWaypoint].transform.position;

修改：

从您的评论中，您可以重复使用WaypointsClass wp = new WaypointsClass（）; 将WaypointsClass wp置于Start 函数之外，然后在Start 函数中初始化，如下所示：

WaypointsClass wp = null; //Outside (Can be used from other functions) void Start () { wp = new WaypointsClass(); //Init wp.waypoints = new GameObject[waypoints.Length]; //This line you missed wp.waypoints = waypoints; Vector3 startPosition = wp.waypoints[currentWaypoint].transform.position; }

Answer 2

您需要在 WaypointsClass 类中构建 GameObject ，否则您将获得空指针异常......

如果你这样做：

wp.waypoints = waypoints;

并且右侧的航点是空参考，您也将获得NPE。

Answer 3

您尚未在MoveEnemy中初始化航点集合 - 您尝试将null分配给wp.waypoints（我假设您收到了NullReferenceException .. ）。

Answer 4

如果没有立即明白，试着再详细说明一下，你从未创造过任何GameObject;数组路径点仍为空，因此当您尝试调用waypoints [0]（currentWaypoint的值）时，返回值为null;因此你的（假设的）错误：“NullReferenceException”。

要解决此问题，请填充阵列！制作一堆GameObject并为它们分配位置。

将一个类的变量与另一个类的实例一起使用时出错

4 个答案: