1、基本框架搭建
1.1首先创建一个枚举类来定义玩家的各个状态，我定义了四种基本状态，可根据具体的要求自我添加状态。

public enum PlayerState
{
    Idle,
    Run,
    Walk,
    Die
}

1.2、创建一个动画状态机控制器类—–PlayerFSMMgr.cs，该类管理玩家所有状态的切换
再创建一个玩家所有状态的基类，所有的状态类都继承于该类PlayerStateAbstract.cs
然后再根据你定义的玩家状态枚举类，定义其单独该状态类。如下图所示，定义了四种状态类， PlayerStateDie.cs ;PlayerStateIdle.cs;PlayerStateRun.cs;PlayerStateWalk.cs,这四个状态类都继承基类PlayerStateAbstract.cs
还有一个玩家控制类PlayerCtrl.cs

2.完善如下

2.1、首先为状态基类PlayerStateAbstract.cs的完善

using UnityEngine;
using System.Collections;
/// <summary>
/// 定义一个玩家角色状态的抽象基类
/// </summary>
public abstract  class PlayerStateAbstract
{
    /// <summary>
    /// 当前角色有限状态机管理器
    /// </summary>
    public PlayerFSMMgr CurFSM;
    /// <summary>
    /// 当前动画状态信息
    /// </summary>
    public AnimatorStateInfo CurrRoleAnimtorStateInfo { get; set; }
    public PlayerStateAbstract(PlayerFSMMgr FSM)
    {
        CurFSM = FSM;
    }
    /// <summary>
    /// 进入状态
    /// </summary>
    public virtual void OnEnter() { }
    /// <summary>
    /// 执行状态
    /// </summary>
    public virtual void OnUpdate() { }
    /// <summary>
    /// 离开状态
    /// </summary>
    public virtual void OnLeave() { }

}

2.2、接下来为4个状态类的完善，此处以PlayerStateWalk.cs为例

using UnityEngine;
using System.Collections;

public class PlayerStateWalk : PlayerStateAbstract
{
    public PlayerStateWalk(PlayerFSMMgr FSM) : base(FSM)
    {
    }
    public override void OnEnter()
    {
        base.OnEnter();
        //播放该状态下的动画
    }

    public override void OnLeave()
    {
        base.OnLeave();
    }
    /// <summary>
    /// 每一帧都执行
    /// </summary>
    public override void OnUpdate()
    {
        base.OnUpdate();
        //可以判断是否动画播放完成，也可以写控制玩家移动的控制判断等
    }
}

2.3、状态机控制器类，包含当前玩家的当前状态枚举以及当前状态属性的定义等，还有玩家状态的切换方法等。

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
/// <summary>
/// 玩家动画状态机控制器
/// </summary>
public class PlayerFSMMgr
{
    /// <summary>
    /// 当前角色状态枚举
    /// </summary>
    public PlayerState CurStateEnum { get; private set; }
    /// <summary>
    /// 当前角色状态类
    /// </summary>
    private PlayerStateAbstract CurState = null;
    /// <summary>
    /// 当前控制器所控制的玩家
    /// </summary>
    public PlayerCtrl CurPlayer;
    public Dictionary<PlayerState, PlayerStateAbstract> PlayerStateDic = new Dictionary<PlayerState, PlayerStateAbstract>();
    /// <summary>
    /// 构造函数，初始化状态类
    /// </summary>
    public PlayerFSMMgr(PlayerCtrl Player)
    {
        CurStateEnum = PlayerState.Idle;
        CurPlayer = Player;
        PlayerStateDic[PlayerState.Idle] = new PlayerStateIdle(this);
        PlayerStateDic[PlayerState.Walk] = new PlayerStateWalk(this);
        PlayerStateDic[PlayerState.Run ] = new PlayerStateRun(this);
        PlayerStateDic[PlayerState.Die ] = new PlayerStateDie(this);
        if(PlayerStateDic.ContainsKey (CurStateEnum ))
        {
            CurState = PlayerStateDic[CurStateEnum];
        }

    }
    /// <summary>
    /// 切换状态类
    /// </summary>
    /// <param name="newState">新状态</param>
    public void ChangeState(PlayerState newState)
    {
        if (CurStateEnum == newState) return;
        if(CurState!=null )
        {
            //调用离开之前的方法
            CurState.OnLeave();
        }
        //将当前状态枚举和当前状态都切换为新状态
        CurStateEnum = newState;
        if(PlayerStateDic.ContainsKey (CurStateEnum))
        {
            CurState = PlayerStateDic[CurStateEnum];
        }
        //并调用新状态进入方法
        CurState.OnEnter();
    }
    /// <summary>
    /// 每帧都执行
    /// </summary>
    public void OnUpdate()
    {
        if(CurState!=null )
        {
            CurState.OnUpdate();
        }
    }
}

2.4、简单的角色控制类，每个角色应该有一个该控制器，每个控制器控制自己角色的动画切换和播放。

using UnityEngine;
using System.Collections;

/// <summary>
/// 玩家控制器
/// </summary>
public class PlayerCtrl : MonoBehaviour {

    /// <summary>
    /// 当前玩家的动画状态器
    /// </summary>
    public PlayerFSMMgr m_FSM;
    void Start ()
    {
        m_FSM = new PlayerFSMMgr(this);
    }

    // Update is called once per frame
    void Update ()
    {
      if(m_FSM!=null )
        {
            m_FSM.OnUpdate();
        }
    }
}

以上为简单的状态机控制器