Unity进阶–fsm状态机的使用笔记

第一种用基础的`if+播放实现动画控制

朴实无华，简单易懂，但是耦合性太差。

switch–case实现状态机

写对应的状态函数

再调用他们，合理，但存在调用问题。

使用状态机

• 编写状态基类

  

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public abstract class FSMState
  {
      public int StateID;
      public MonoBehaviour Mono;
      public FSMManager FSMManager;
  
      public FSMState(int stateID, MonoBehaviour mono, FSMManager manager){
          StateID = stateID;
          Mono = mono;
          FSMManager = manager;
      }
      
      public abstract void OnEnter();
  
      public abstract void OnUpdate();
  }
  
  

• 编写状态机基类

  

  using System.Collections;
  using System.Collections.Generic;
  
  public class FSMManager
  {
     public List<FSMState> StateList = new List<FSMState>();
     public int CurrentIndex = -1;
  
     public void ChangeState(int StateID){
        CurrentIndex = StateID;
        StateList[CurrentIndex].OnEnter(); 
     }
  
     public void Update() {
        if (CurrentIndex != -1){
          StateList[CurrentIndex].OnUpdate();
        }
     }
  }
  
  

• 编写状态枚举

  

  public enum PlayState
  {
      idle,
      run,
      wave   
  }
  
  

• 编写几个状态

  

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class RunState : FSMState
  {
      public RunState(int stateID, MonoBehaviour mono, FSMManager manager) : base(stateID, mono, manager)
      {
      }
  
      public override void OnEnter()
      {
          Mono.GetComponent<Animator>().SetFloat("Speed",5);
      }
  
      public override void OnUpdate()
      {
          float horizontal = Input.GetAxis("Horizontal");
          float vertical = Input.GetAxis("Vertical");
          Vector3 dir = new Vector3(horizontal, 0, vertical);
          if (dir != Vector3.zero){
             Mono.transform.rotation = Quaternion.LookRotation(dir);
             Mono.transform.Translate(Vector3.forward * 5 * Time.deltaTime);
          }
          else {
              FSMManager.ChangeState((int)PlayState.idle);
          }
      }
  }
  
  
  

  

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class IdleState : FSMState
  {
      public IdleState(int stateID, MonoBehaviour mono, FSMManager manager) : base(stateID, mono, manager)
      {
      }
  
      public override void OnEnter()
      {
          Mono.GetComponent<Animator>().SetFloat("Speed",0);
      }
  
      public override void OnUpdate()
      {
          float horizontal = Input.GetAxis("Horizontal");
          float vertical = Input.GetAxis("Vertical");
          Vector3 dir = new Vector3(horizontal, 0, vertical);
          if (dir != Vector3.zero){
             FSMManager.ChangeState((int)PlayState.run);
          }
  
          if (Input.GetKeyDown(KeyCode.Space)){
              Debug.Log("按下空格");
              FSMManager.ChangeState((int)PlayState.wave);
          }
      }
  }
  
  
  

  

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  
  public class WaveState : FSMState
  {
      public WaveState(int stateID, MonoBehaviour mono, FSMManager manager) : base(stateID, mono, manager)
      {
      }
  
      public override void OnEnter()
      {
          Mono.GetComponent<Animator>().SetBool("Rest",true);
      }
  
      public override void OnUpdate()
      {
          if(!Mono.GetComponent<Animator>().GetCurrentAnimatorStateInfo(0).IsName("Rest")){
              FSMManager.ChangeState((int)PlayState.idle);
              Mono.GetComponent<Animator>().SetBool("Rest",false);
          }
      }
  }
  
  
  
  

  • 编写对应的角色控制状态机

    

    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    
    public class PlayControl : MonoBehaviour
    {
        private FSMManager fSMManager;
        // Start is called before the first frame update
        void Start()
        {
            fSMManager = new FSMManager();
            IdleState idleState = new IdleState(0, this, fSMManager);
            RunState  runState  = new RunState(1, this, fSMManager);
            WaveState waveState = new WaveState(2, this, fSMManager);
    
            fSMManager.StateList.Add(idleState);
            fSMManager.StateList.Add(runState);
            fSMManager.StateList.Add(waveState);
            fSMManager.ChangeState((int)PlayState.idle);
        }
    
        // Update is called once per frame
        void Update()
        {
            fSMManager.Update();
        }
    }