在设计一中，我们把IState类设计了一下，接下来，我们写一下FiniteStateMachine这个类，这个类主要的作用就是对于外界调用，这个类是独立封装的，不继承Mono。这个类的功能是提供一个栈，用于存放FSState，还有通过Update进行状态的切换，以及对栈的管理，Pop和Push操作以及状态的注册。最重要的一点是声明了三个委托函数代码如下：
创新互联公司服务项目包括鲅鱼圈网站建设、
鲅鱼圈网站制作、鲅鱼圈网页制作以及鲅鱼圈网络营销策划等。多年来，我们专注于互联网行业，利用自身积累的技术优势、行业经验、深度合作伙伴关系等，向广大中小型企业、政府机构等提供互联网行业的解决方案，
鲅鱼圈网站推广取得了明显的社会效益与经济效益。目前，我们服务的客户以成都为中心已经辐射到鲅鱼圈省份的部分城市，未来相信会继续扩大服务区域并继续获得客户的支持与信任！
public delegate void EnterState(string stateName);
public delegate void PushState(string stateName, string lastStateName);
public delegate void PopState();
主要是用于状态之间的切换。定义了Dictionary和Stack，前者用于State注册，后者是状态切换。代码如下：
protected Dictionary mStates;
protected Stack mStateStack;
对应的相关处理函数如下：
public void Register(string stateName, IState stateObject) {
if (mStates.Count == 0)
mEntryPoint = stateName;
mStates.Add(stateName, new FSState(stateObject, this, stateName, Enter, Push, Pop));
}用于状态机的注册，对Stack的操作是如下两个函数，一个是Pop，一个是Push函数。代码如下：
public void Push(string newState) {
string lastName = null;
if (mStateStack.Count > 1) {
lastName = mStateStack.Peek().StateName;
}
Push(newState, lastName);
}
protected void Push(string stateName, string lastStateName) {
mStateStack.Push(mStates[stateName]);
mStateStack.Peek().StateObject.OnEnter(lastStateName);
}
public void Pop() {
Pop(null);
}
protected string Pop(string newName) {
FSState lastState = mStateStack.Peek();
string newState = null;
if (newName == null && mStateStack.Count > 1) {
int index = 0;
foreach (FSState item in mStateStack) {
if (index++ == mStateStack.Count - 2) {
newState = item.StateName;
}
}
}
else {
newState = newName;
}
string lastStateName = null;
if (lastState != null) {
lastStateName = lastState.StateName;
lastState.StateObject.OnExit(newState);
}
mStateStack.Pop();
return lastStateName;
}下面增加了状态触发消息事件，代码如下：
public void Trigger(string eventName) {
CurrentState.Trigger(eventName);
}
public void Trigger(string eventName, object param1) {
CurrentState.Trigger(eventName, param1);
}
public void Trigger(string eventName, object param1, object param2) {
CurrentState.Trigger(eventName, param1, param2);
}
public void Trigger(string eventName, object param1, object param2, object param3) {
CurrentState.Trigger(eventName, param1, param2, param3);
}最后把FiniteStateMachine核心的功能给大家介绍完了，下面奉上整个类的代码：
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class FiniteStateMachine {
public delegate void EnterState(string stateName);
public delegate void PushState(string stateName, string lastStateName);
public delegate void PopState();
protected Dictionary mStates;
protected string mEntryPoint;
protected Stack mStateStack;
public FiniteStateMachine() {
mStates = new Dictionary();
mStateStack = new Stack();
mEntryPoint = null;
}
public void Update() {
if (CurrentState == null) {
mStateStack.Push(mStates[mEntryPoint]);
CurrentState.StateObject.OnEnter(null);
}
CurrentState.StateObject.OnUpdate();
}
public void Register(string stateName, IState stateObject) {
if (mStates.Count == 0)
mEntryPoint = stateName;
mStates.Add(stateName, new FSState(stateObject, this, stateName, Enter, Push, Pop));
}
public FSState State(string stateName) {
return mStates[stateName];
}
public void EntryPoint(string startName) {
mEntryPoint = startName;
}
public FSState CurrentState {
get {
if (mStateStack.Count == 0)
return null;
return mStateStack.Peek();
}
}
public void Enter(string stateName) {
Push(stateName, Pop(stateName));
}
public void Push(string newState) {
string lastName = null;
if (mStateStack.Count > 1) {
lastName = mStateStack.Peek().StateName;
}
Push(newState, lastName);
}
protected void Push(string stateName, string lastStateName) {
mStateStack.Push(mStates[stateName]);
mStateStack.Peek().StateObject.OnEnter(lastStateName);
}
public void Pop() {
Pop(null);
}
protected string Pop(string newName) {
FSState lastState = mStateStack.Peek();
string newState = null;
if (newName == null && mStateStack.Count > 1) {
int index = 0;
foreach (FSState item in mStateStack) {
if (index++ == mStateStack.Count - 2) {
newState = item.StateName;
}
}
}
else {
newState = newName;
}
string lastStateName = null;
if (lastState != null) {
lastStateName = lastState.StateName;
lastState.StateObject.OnExit(newState);
}
mStateStack.Pop();
return lastStateName;
}
public void Trigger(string eventName) {
CurrentState.Trigger(eventName);
}
public void Trigger(string eventName, object param1) {
CurrentState.Trigger(eventName, param1);
}
public void Trigger(string eventName, object param1, object param2) {
CurrentState.Trigger(eventName, param1, param2);
}
public void Trigger(string eventName, object param1, object param2, object param3) {
CurrentState.Trigger(eventName, param1, param2, param3);
}
}上面整个FSMStateMachine类就封装完了，要知后事如何？且看系列三的讲解。
另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
网站标题：U3D架构系列之-FSM有限状态机设计二-创新互联
文章位置：
http://cdkjz.cn/article/dcicgs.html
