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UnityEvent绑定过程中，放在Start（）中绑定会报错（通过脚本添加UnityEvent事件脚本，绑定）

绑定事件放在OnEnable（）中不会报错，但是依然不可以立刻添加UnityEvent事件脚本紧接着立刻绑定事件。

或者在Start（）添加UnityEvent事件的脚本与绑定间隔时间长一些也不会报错。

示例：

创建点击对象方法

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
public class My3DObjOnClick : MonoBehaviour
{public UnityEvent events;private void OnMouseUpAsButton(){// if (EventSystem.current.IsPointerOverGameObject()) return;events.Invoke();}
}

报错案例1： 

创建绑定方法：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;public class Test : MonoBehaviour
{public Transform tar;//private void Start(){add_click_listener(Redian1_Click);}public void add_click_listener( UnityAction onclick){tar.gameObject .AddComponent<My3DObjOnClick>();tar.GetComponent<My3DObjOnClick>().events.AddListener(onclick);}private void Redian1_Click(){Debug.Log("Redian1_Click");}
}

报错案例2：  

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;public class Test : MonoBehaviour
{public Transform tar;private void Start(){  add_click_listener(Redian1_Click);}public void add_click_listener( UnityAction onclick){tar.gameObject .AddComponent<My3DObjOnClick>(); StartCoroutine("ceshi", onclick);}IEnumerator ceshi(UnityAction onclick){yield return new WaitForEndOfFrame  ();//如果将时间延长，延长到5s则不会报错//  yield return new WaitForSeconds (5);tar.GetComponent<My3DObjOnClick>().events.AddListener(onclick);}private void Redian1_Click(){Debug.Log("Redian1_Click");// panelModel1_UICtrl.Open_Redian1();}
}

 报错案例3：  

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;public class Test : MonoBehaviour
{public Transform tar;private void OnEnable(){   add_click_listener(Redian1_Click);}public void add_click_listener( UnityAction onclick){tar.gameObject .AddComponent<My3DObjOnClick>();tar.GetComponent<My3DObjOnClick>().events.AddListener(onclick);}private void Redian1_Click(){Debug.Log("Redian1_Click");}
}

  不报错案例1：  

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
public class Test : MonoBehaviour
{public Transform tar;private void OnEnable(){add_click_listener(Redian1_Click);}public void add_click_listener( UnityAction onclick){tar.gameObject .AddComponent<My3DObjOnClick>();StartCoroutine("ceshi", onclick);}IEnumerator ceshi(UnityAction onclick){yield return new WaitForEndOfFrame  ();tar.GetComponent<My3DObjOnClick>().events.AddListener(Redian1_Click);}private void Redian1_Click(){Debug.Log("Redian1_Click");}
}

不报错案例2：   

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;public class Test : MonoBehaviour
{public Transform tar;private void Start(){  add_click_listener(Redian1_Click);}public void add_click_listener( UnityAction onclick){tar.gameObject .AddComponent<My3DObjOnClick>(); StartCoroutine("ceshi", onclick);}IEnumerator ceshi(UnityAction onclick){yield return new WaitForSeconds (5);tar.GetComponent<My3DObjOnClick>().events.AddListener(onclick);}private void Redian1_Click(){Debug.Log("Redian1_Click");// panelModel1_UICtrl.Open_Redian1();}
}

 不报错案例3：   

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;public class Test : MonoBehaviour
{public Transform tar;private void OnEnable(){tar.gameObject .AddComponent<My3DObjOnClick>();}private void Update(){if (Input.GetKeyDown(KeyCode.W)){tar.GetComponent<My3DObjOnClick>().events.AddListener(Redian1_Click);}}private void Redian1_Click(){Debug.Log("Redian1_Click");}
}