创建可交互的物体的公共的父类（Interactable）

InteractableObject 类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

/// <summary>
/// NPC和Pickable的父类
/// </summary>

public class InteractableObject : MonoBehaviour
{
    private NavMeshAgent playerAgent;
    private bool haveInteeacted;标志位（是否进行交互过，默认每次点击只交互一次）
    public void OnClick(NavMeshAgent playerAgent)//将 NavMeshAgent 组件传递过来。
    {
        this.playerAgent = playerAgent;
        playerAgent.stoppingDistance = 2;与被交互的物体设置的边距（保证不穿模）。
        playerAgent.SetDestination(transform.position);//设置目标位置让其移到附近。
        haveInteeacted = false;//添加上这个便可以将面板再次显示。
    }

    private void Update()
    {
        if(playerAgent != null && haveInteeacted == false && playerAgent .pathPending==false)
        {
            if(playerAgent.remainingDistance<=2)//到达目标位置才进行交互。
            {
                Interact();//交互
                haveInteeacted = true;
            }
        }
    }
    protected virtual void Interact()
    {
        print("Interacting with Interactable Object.");
    }
}

NPCObject 类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 定义NPC
/// </summary>

public class NPCObject : InteractableObject//继承自InteractableObject
{
    public new string name;
    //public string Name {  get; set; }

    public string[] contentList;

    //public DialogueUI dialogueUI;
    protected override void Interact()
    {
        //dialogueUI.Show(name, contentList);
        DialogueUI.Instance.Show(name, contentList);
    }
}

PickableObject 类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 定义Pickable的动作
/// </summary>

public class PickableObject : InteractableObject
{
    public ItemScriptObject itemSO;//用来表示哪个Item

    protected override void Interact()
    {
        Destroy(this.gameObject);
        InventoryManager.Instance.AddItem(itemSO); 
    }
}