Unity有限状态机

参考：http://www.cnblogs.com/unity3/archive/2013/04/05/3000692.html

但是原作者代码有点问题，自己进行了改写

using System.Collections;using System.Collections.Generic;using UnityEngine;public enum Translate{    NullTrans,    SeePlayer,    PlayerStop}public enum StateID{    NullState,    Idle,    FollowPlayer,}public abstract class FMS_State{    private StateID id;    public StateID ID    {        set { id = value; }        get { return id; }    }    public virtual void DoBeforeEnter() { }    public virtual void DoBeforeMoveing() { }    public abstract void Reason(GameObject player, GameObject NPC);     public abstract void Act(GameObject player, GameObject NPC);}public class Idle_State : FMS_State{    FMS_Machine_Manage _fms_machine_Manage;    public Idle_State(FMS_Machine_Manage mrg)    {        _fms_machine_Manage = mrg;        ID = StateID.Idle;    }    public override void Reason(GameObject player, GameObject NPC)    {        if (Input.GetKeyDown(KeyCode.Z))        {            _fms_machine_Manage.changeState(Translate.SeePlayer);        }    }    public override void Act(GameObject player, GameObject NPC)    {        Debug.Log("Act_Idle");    }}public class Follow_State : FMS_State{    FMS_Machine_Manage _fms_machine_Manage;    public Follow_State(FMS_Machine_Manage mrg)    {        _fms_machine_Manage = mrg;        ID = StateID.FollowPlayer;    }    public override void Reason(GameObject player, GameObject NPC)    {        if (Input.GetKeyDown(KeyCode.X))        {            _fms_machine_Manage.changeState(Translate.PlayerStop);        }    }    public override void Act(GameObject player, GameObject NPC)    {        Debug.Log("Act_Follow");    }}public class FMS_Machine_Manage : MonoBehaviour {    private List<FMS_State> states;    private Dictionary<Translate, StateID> map = new Dictionary<Translate, StateID>();    private FMS_State currentState;    private StateID currentStateID;    public GameObject player;    public GameObject NPC;    public FMS_State CurrentState    {        set { currentState = value; }        get { return currentState; }    }    public StateID CurrentStateID    {        set { currentStateID = value; }        get { return currentStateID; }    }    public void UpdateFunction()    {        CurrentState.Reason(player, NPC);        CurrentState.Act(player, NPC);    }    void Awake()    {        states = new List<FMS_State>();    }    public void addDictionary(Translate tr, StateID id1)    {        if (tr == Translate.NullTrans)        {            Debug.LogError("Null Trans is not allower to adding into");            return;        }        if (id1 == StateID.NullState)        {            Debug.LogError("Null State id not ~~~");            return;        }        if (map.ContainsKey(tr))        {            Debug.LogError(id1.ToString() + "is already added to");            return;        }        map.Add(tr, id1);    }    public void deleateDictionary(Translate tr)    {        if (tr == Translate.NullTrans)        {            Debug.LogError("TransNull is not allowed to delate");            return;        }        if (map.ContainsKey(tr))        {            map.Remove(tr);            return;        }        Debug.LogError(tr.ToString() + "are not exist");    }    public StateID GetOutState(Translate tr)    {        if (map.ContainsKey(tr))        {            return map[tr];        }        return StateID.NullState;    }    public void MakeFMSMachine()    {        Idle_State idle = new Idle_State(this);        Follow_State follow = new Follow_State(this);        AddFmsState(idle);        AddFmsState(follow);        addDictionary(Translate.PlayerStop, StateID.Idle);        addDictionary(Translate.SeePlayer, StateID.FollowPlayer);    }    public void AddFmsState(FMS_State s)    {        if (s == null)        {            Debug.LogError(" Null reference is not allowed");        }        if (states.Count == 0)        {            states.Add(s);                               currentState = s;            currentStateID = s.ID;            return;        }        foreach (FMS_State state in states)        {            if (state == s)            {                Debug.LogError(s.ID.ToString() + "has already been added");                return;            }        }        states.Add(s);    }    public void delateFmsState(StateID id)    {        if (id == StateID.NullState)        {            Debug.LogError("NullStateID is not allowed for a real state");            return;        }        foreach (FMS_State state in states)        {            if (state.ID == id)            {                states.Remove(state);                return;            }        }    }    public void changeState(Translate tr)    {        if (tr == Translate.NullTrans)        {            Debug.LogError("NullTransition is not allowed for a real transition");            return;        }        StateID id = GetOutState(tr);        currentStateID = id;        foreach (FMS_State state in states)        {            if (currentStateID == state.ID)            {                CurrentState.DoBeforeMoveing();                 currentState = state;                CurrentState.DoBeforeEnter();                break;            }        }    }}