游戏设计模式-状态模式

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

namespace DesignPattern
{
    /// <summary>
    /// 角色AI【状态拥有者】
    /// 拥有当前的状态，并且可以切换当前的状态
    /// </summary>
    public abstract class ICharacterAI
    {
        /// <summary>
        /// 角色当前AI状态
        /// </summary>
        protected IAIState IAIState = null;

        /// <summary>
        /// AI状态切换
        /// </summary>
        /// <param name="newAIState"></param>
        public virtual void ChangeAIState(IAIState newAIState)
        {
            IAIState = newAIState;
            IAIState.SetCharacterAI(this);
        }


    }

    /// <summary>
    /// AI状态类基类 【状态】
    /// </summary>
    public abstract class IAIState
    {
        protected ICharacterAI CharacterAI = null;

        /// <summary>
        /// 设置CharacterAI对象
        /// </summary>
        /// <param name="characterAI"></param>
        public void SetCharacterAI(ICharacterAI characterAI)
        {
            CharacterAI = characterAI; 
        }

        /// <summary>
        /// 状态更新以及状态切换检查
        /// </summary>
        public abstract void Update();
    }

    /// <summary>
    ///状态A
    /// </summary>
    public class StateA : IAIState
    {
        public override void Update()
        {
            
        }
    }

    /// <summary>
    /// 状态B
    /// </summary>
    public class StateB : IAIState
    {
        public override void Update()
        {
           
        }
    }
}