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<h1 id="ios-开源库源码分析之状态机transitionkit">iOS 开源库源码分析之状态机TransitionKit</h1>
<h3 id="状态机">状态机</h3>
<p>有限状态机（finite-state machine），简称状态机。它有几个特征</p>
<ul>
<li>状态（state）总数是有限的</li>
<li>任意时刻，只处在一种状态之中</li>
<li>某种条件下，会从一种状态转变（transition）到另一种状态</li>
</ul>
<p>状态机能够很好的管理复杂业务。在电商场景（订单，物流，售后），社交（IM消息投递），播放等都可以有很好的应用。适用于有一个明确 且复杂的状态流的场景。状态机能够很好的提高代码的可维护性和可测试性。</p>
<h3 id="tkstate">TKState</h3>
<p>表示状态对象</p>
<p>里面会定义state的name以及四个重要的block（willEnter，didEnter，willExit，didExit）</p>
<h3 id="tkevent">TKEvent</h3>
<p>表示事件对象</p>
<ul>
<li><p>目标状态destinationState</p>
</li>
<li><p>定义有哪些可以到达目标状态的来源状态sourceStates</p>
</li>
<li><p>以及是三个重要的block（shouldFireEvent，willFireEvent，didFireEvent）</p>
</li>
</ul>
<h3 id="tktransition">TKTransition</h3>
<p>一个事件中状态转换的对象</p>
<p>主要有事件对象，来源state</p>
<h3 id="tkstatemachine">TKStateMachine</h3>
<p>状态机对象</p>
<p>管理状态相关东西，</p>
<ul>
<li>initialState，初始化的状态</li>
<li>states，所有的状态</li>
<li>currentState，当前的状态</li>
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<p>管理事件相关的东西</p>
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<li>events，所有的的事件</li>
<li>添加事件</li>
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<p>状态机相关的方法</p>
<ul>
<li><p>activate方法，激活状态机，这个时候进入初始状态</p>
</li>
<li><p>canFireEvent方法，判断当前state是否在event的来源state数组中。</p>
</li>
<li><p>fireEvent: userInfo: error:方法，执行的内容包括下面</p>
</li>
<li><p>判断状态机激活</p>
</li>
<li>判断当前state是否在event的来源state数组中</li>
<li>构造TKTransition对象</li>
<li>调用event和state的相关回调</li>
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