1 using System;
 2 using System.Collections;
 3 using System.Collections.Generic;
 4 using UnityEngine;
 5 
 6 public class FSM : MonoBehaviour
 7 {
 8     //状态列表
 9     private List<FSMState> stateList;
10     //当前状态
11     private FSMState currentState;
12     [Tooltip("默认状态编号")]
13     public FSMStateID defaultStateID;
14     //默认状态
15     FSMState defaultState;
16 
17     private void Start()
18     {
19         ConfigFSM();
20         InitDefaultState();
21     }
22     //配置状态机
23     private void ConfigFSM()
24     {
25         stateList = new List<FSMState>();
26         //添加状态
27         //stateList.Add(xxState);
28         //添加条件
29         //xxState.AddMap(xx,xx);
30     }
31 
32     private void InitDefaultState()
33     {
34         defaultState = stateList.Find(s => s.StateID == defaultStateID);
35 
36         currentState = defaultState;
37 
38         currentState.EnterState(this);
39 
40     }
41 
42     private void Update()
43     {
44         currentState.Reason(this);
45         currentState.Action(this);
46     }
47 
48     //切换状态
49     public void ChangeState(FSMStateID nextStateID)
50     {
51         FSMState nextState = nextStateID == FSMStateID.Default ? defaultState : stateList.Find(s => s.StateID == nextStateID);
52 
53         currentState.ExitState(this);
54         currentState = nextState;
55         currentState.EnterState(this);
56     }
57 
58 }
 1 using System;
 2 using System.Collections;
 3 using System.Collections.Generic;
 4 using UnityEngine;
 5 
 6 public abstract class FSMState{
 7 
 8     //状态ID
 9     public FSMStateID StateID { get; set; }
10 
11     public FSMState()
12     {
13         triggerList = new List<FSMTrigger>();
14         map = new Dictionary<FSMTriggerID, FSMStateID>();
15         Init();
16     }
17 
18     protected abstract void Init();
19     //状态要有条件列表
20     List<FSMTrigger> triggerList;
21     private Dictionary<FSMTriggerID, FSMStateID> map;
22 
23     //添加映射
24     public void AddMap(FSMTriggerID triggerID, FSMStateID stateID)
25     {
26         map.Add(triggerID, stateID);
27         AddTriggerObject(triggerID);
28     }
29 
30     //反射创建对象
31     private void AddTriggerObject(FSMTriggerID trigger)
32     {
33         Type type = Type.GetType(trigger + "Trigger");
34         var obj = Activator.CreateInstance(type) as FSMTrigger;
35         triggerList.Add(obj);
36     }
37 
38     //条件检测
39     public void Reason(FSM fsm)
40     {
41         for (int i = 0; i < triggerList.Count; i++)
42         {
43             if (triggerList[i].HandleTrigger(fsm))
44             {
45                 //切换状态
46                 FSMStateID stateId = map[triggerList[i].TriggerID];
47                 //通过状态机切换状态
48 
49                 return;
50             }
51         }
52     }
53 
54     public virtual void EnterState(FSM fsm) { }
55     public virtual void Action(FSM fsm) { }
56     public virtual void ExitState(FSM fsm) { }
57 }
 1 using System;
 2 using System.Collections;
 3 using System.Collections.Generic;
 4 using UnityEngine;
 5 
 6 public abstract class FSMTrigger{
 7     //条件编号
 8     public FSMTriggerID TriggerID { get; set; }
 9 
10     public FSMTrigger()
11     {
12         Init();
13     }
14     //初始化（要求子类必须初始化条件编号）
15     protected abstract void Init();
16 
17     public abstract bool HandleTrigger(FSM fsm);
18 }
 1 using System.Collections;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 4 
 5 public enum FSMStateID{
 6     None,
 7     Default,
 8     Dead,
 9     Idle,
10     Pursuit,
11     Attacking,
12     Patrolling
13 }
 1 using System.Collections;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 4 
 5 public enum FSMTriggerID
 6 {
 7     NoHealth,
 8     SawTarget,
 9     ReachTarget,
10     CompleteTarget,
11     KilledTarget,
12     WithoutAttackRange
13 }