UnityEvent与数组显示空引用错误

Question

这是代码段。我做错了什么。

using UnityEngine;
using System.Collections;
using UnityEngine.Events;

public class UnityEventSystemDemo : MonoBehaviour {
    UnityEvent[] objUE;

    // Use this for initialization
    void Start () {

        objUE = new UnityEvent[2];
        objUE[0].AddListener(CustomEvent);///Null ref at this point
        objUE[1].AddListener(CustomEvent);

    }

    // Update is called once per frame
    void Update () {

        if (Input.GetMouseButtonDown(0)) {
            Debug.Log("left clicked..");
            //calling Events
            objUE[0].Invoke();
            objUE[1].Invoke();
        }

    }

    void CustomEvent() {

        Debug.Log("customEvent..");

    }

    void CustomEvent1()
    {

        Debug.Log("customEvent1..");

    }
}

  

NullReferenceException：未将对象引用设置为的实例   对象UnityEventSystemDemo.Update（）（at   资产/脚本/ UnityEventSystemDemo.cs：23）

Answer 1

您忘记初始化数组元素。尝试更新这样的Start方法。

objUE = new UnityEvent[2];
objUE[0] = new UnityEvent();
objUE[0].AddListener(CustomEvent);///Null ref at this point
objUE[1] = new UnityEvent();
objUE[1].AddListener(CustomEvent);