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<h2 id="iOS-vs-Flutter-语法篇"><a href="#iOS-vs-Flutter-语法篇" class="headerlink" title="iOS vs Flutter(语法篇)"></a>iOS vs Flutter(语法篇)</h2><p>首先说一下，为什么要关心iOS和Flutter的区别问题。因为移动端开发的业务逻辑设计模式等是一致的，区别可能只在于使用的语言不同，实现逻辑的风格不同而已。所以这里我们先分析一下iOS和Flutter的区别到底有哪些，有利于我们更快地去入门。</p>
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<h3 id="NSCache"><a href="#NSCache" class="headerlink" title="NSCache"></a>NSCache</h3><p>NSCache使用很方便，提供了类似可变字典的实现方式，但它比可变字典更适用于实现缓存。</p>
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<li>最重要的原因是<code>NSCache</code>是线程安全的，使用<code>NSMutableDictionary</code>自定义实现缓存的时候需要考虑加锁和释放锁，<code>NSCache</code>已经帮我们做好了这一步。</li>
<li>其次，内存不足时<code>NSCache</code>会自动释放存储的对象，不需要手动干预，如果是自定义实现需要监听内存状态然后做进一步删除对象的操作。</li>
<li>还有一点<code>NSCache</code>的键<code>key</code>不会被复制，所以<code>key</code>不需要实现<code>NSCopying</code>协议。</li>
</ul>
<p>以上三点就是<code>NSCache</code>相比于<code>NSMutableDictionary</code>实现缓存功能的优点，在需要实现缓存的时候应优先考虑使用<code>NSCache</code>。</p>
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<h3 id="主要概念"><a href="#主要概念" class="headerlink" title="主要概念"></a>主要概念</h3><h4 id="事件"><a href="#事件" class="headerlink" title="事件"></a>事件</h4><p>用户使用app的过程中，会产生各种各样的事件，iOS事件大体分为3种类型</p>
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<li>触摸事件</li>
<li>加速计事件</li>
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<p>加速计事件可以用来做摇一摇等功能，而耳机控制音量大小等则属于远程控制事件。</p>
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