在設計敵人AI時可以先製作基礎的能力像是攻擊、閃避、追蹤玩家或者進行其他動作，要達成這些功能可以透過Enum和StartCoroutine來實現。

實作

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

public class EnemyControl : MonoBehaviour
{
    public enum EnemyBehavior {patrol,battle};
    public EnemyBehavior EnemyNow;
    public float speed;
    private Transform mytransform;
    private Transform playertransform;
    private SpriteRenderer spr;
    void Start()
    {
        EnemyBehavior = Status.patrol;
        spr = this.transform.GetComponent<SpriteRenderer>();
        mytransform = this.transform;
        if (GameObject.Find("player") != null)
        {
            playertransform = GameObject.Find("player").transform;
        }
        StartCoroutine(DoCheck());
    }

   private void FixedUpdate() ...
}

  //偵測功能
     bool PlayerCheck()
    {
        if (Mathf.Abs(mytransform.position.x - playertransform.position.x) < 4f)
        {
            //當玩家和敵人距離小於4時回傳true進入戰鬥
            return true;
        }     
  
        return false;
    }
    IEnumerator DoCheck()
    {
        for (; ; )
        {
            if (PlayerCheck())
            {
                    EnemyNow = EnemyBehavior.battle;
            }
            yield return new WaitForSeconds(.1f);
        }
    }

待更

參考資料:
https://www.youtube.com/watch?v=pQ9Fabgvusk&t=6s