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<article id="post-UICollectionView之旅" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/06/18/UICollectionView之旅/">UICollectionView 之旅</a>
</h1>
<a href="/2018/06/18/UICollectionView之旅/" class="archive-article-date">
<time datetime="2018-06-18T07:48:04.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-06-18</time>
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<blockquote>
<p>本文是 WWDC 2018 Session 225 读后感，其视频及配套 PDF文稿 地址如下 <a href="https://developer.apple.com/videos/play/wwdc2018/225/" target="_blank" rel="noopener">A Tour Of UICollectionView</a>。</p>
<p>这篇文章难度不大，由易到难，逐层深入，是一篇很好的 Session。全文总计约2500字，通读全文花费时间大约15分钟。</p>
</blockquote>
<p><img src="https://user-gold-cdn.xitu.io/2018/6/11/163ebff885e9f396?imageView2/2/w/480/h/480/q/85/interlace/1" alt=""></p>
<a class="article-more-a" href="/2018/06/18/UICollectionView之旅/#more">more >></a>
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<a href="javascript:void(0)" class="js-tag article-tag-list-link color5">WWDC 2018</a>
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<a class="article-more-a" href="/2018/06/18/UICollectionView之旅/">展开全文 >></a>
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<article id="post-这两天面试的一些整理" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/05/16/这两天面试的一些整理/">这两天面试的一些整理</a>
</h1>
<a href="/2018/05/16/这两天面试的一些整理/" class="archive-article-date">
<time datetime="2018-05-16T04:42:53.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-16</time>
</a>
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<p>这篇短文主要针对我在本周一和周二所经历的两家公司面试，做简短的总结。</p>
<p>上周我在智联招聘上简单的更新了一下自己的简历。不承想有多家公司邀请进行面试。本着检测自身技术水平，同时了解当前市场的想法，我接受了几家。上午有时间就简单的总结一下，前两家的一个面试过程，以及自己的一些心得感悟。</p>
<p><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1526457040696&di=0c64726aa0fbf502bbb2af5142b8a1c2&imgtype=0&src=http%3A%2F%2Fimg2.jiemian.com%2F101%2Foriginal%2F20170408%2F149163479116565200.jpg" alt=""></p>
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<a class="article-more-a" href="/2018/05/16/这两天面试的一些整理/">展开全文 >></a>
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<article id="post-写在汶川地震十周年" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<header class="article-header">
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<a class="article-title" href="/2018/05/12/写在汶川地震十周年/">写在汶川地震十周年</a>
</h1>
<a href="/2018/05/12/写在汶川地震十周年/" class="archive-article-date">
<time datetime="2018-05-12T06:12:30.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-05-12</time>
</a>
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<p>这是我第一次在自己的技术博客更新个人随笔，写随笔的习惯已经被放弃好几年了，上学的时候，所思、所想、所悟，都会写出来，发在 <code>QQ空间</code>、<code>人人网</code>上，当时的目的主要是增进和朋友们的互动，有一些炫耀的成分，会仔细斟酌遣词造句，争取写的华丽而又有趣。大四毕业骑车去拉萨之前，我翻看了自己的近 1000 多条 <code>QQ空间</code> 的说说和日志，突然觉得幼稚的难以言表，所以一下子清理了自己以前写的很多文字，现在想想有一些后悔，无论自己的过去在如今看来怎样的荒唐，也应该正面过去的自己，人是在不断地变化中的，思维方式和三观也在不断演变，对过去的自己采取割袍断义式的决绝，是不现实的。</p>
<p><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1526102080221&di=66ea59e6afb71ab2ff1731174580d1ea&imgtype=0&src=http%3A%2F%2Fs16.sinaimg.cn%2Fmiddle%2F60a2bc87n797ecbb4380f%26690" alt=""></p>
<a class="article-more-a" href="/2018/05/12/写在汶川地震十周年/#more">more >></a>
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<a class="article-more-a" href="/2018/05/12/写在汶川地震十周年/">展开全文 >></a>
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<article id="post-iOS常用宏定义" class="article article-type-post article-index" itemscope itemprop="blogPost">
<div class="article-inner">
<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2018/01/23/iOS常用宏定义/">iOS常用宏定义</a>
</h1>
<a href="/2018/01/23/iOS常用宏定义/" class="archive-article-date">
<time datetime="2018-01-23T07:28:10.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-01-23</time>
</a>
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<p><strong>为了简化开发流程，提升工作效率，收集了一些平时常用的宏定义，今后会不定期更新</strong></p>
<h3 id="1-UI元素"><a href="#1-UI元素" class="headerlink" title="1.UI元素"></a>1.UI元素</h3><figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//NavBar高度</span></span><br><span class="line"><span class="meta">#define NAVIGATIONBAR_HEIGHT 44</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//StatusBar高度</span></span><br><span class="line"><span class="meta">#define STATUSBAR_HEIGHT 20</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//获取屏幕 宽度、高度</span></span><br><span class="line"><span class="meta">#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)</span></span><br><span class="line"><span class="meta">#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//内容视图高度</span></span><br><span class="line"><span class="meta">#define CONTENT_HEIGHT (SCREEN_HEIGHT - NAVIGATIONBAR_HEIGHT - STATUSBAR_HEIGHT)</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//KWindow</span></span><br><span class="line"><span class="meta">#define KWINDOW [UIApplication sharedApplication].keyWindow</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//屏幕分辨率</span></span><br><span class="line"><span class="meta">#define SCREEN_RESOLUTION (SCREEN_WIDTH * SCREEN_HEIGHT * ([UIScreen mainScreen].scale))</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//状态栏 ＋ 导航栏 高度</span></span><br><span class="line"><span class="meta">#define STATUS_AND_NAVIGATION_HEIGHT ((STATUSBAR_HEIGHT) + (NAVIGATIONBAR_HEIGHT))</span></span><br></pre></td></tr></table></figure>
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<article id="post-Core ML入门：构建一个简单的图像识别应用" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/01/06/Core ML入门：构建一个简单的图像识别应用/">Core ML入门：构建一个简单的图像识别应用</a>
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<a href="/2018/01/06/Core ML入门：构建一个简单的图像识别应用/" class="archive-article-date">
<time datetime="2018-01-06T01:21:22.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-01-06</time>
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<p><a href="http://www.appcoda.com/coreml-introduction/" target="_blank" rel="noopener">原文链接</a></p>
<p><strong>原翻译者：智多芯</strong></p>
<p><strong>本人负责翻译、校对。</strong></p>
<p>Apple 公司在 WWDC 2017 发布了几个令开发者感到兴奋的框架和 API，而在这些新框架中最受欢迎的绝对非 <a href="https://developer.apple.com/documentation/coreml" target="_blank" rel="noopener">Core ML</a> 莫属了。开发者可以通过 Core ML 框架将机器学习模型集成到应用程序中，该框架最大的优点是使用它并不需要开发者具备额外的神经网络或机器学习知识。Core ML 框架的另一个特点是，只要开发者将已经训练好的数据模型转换成了 Core ML 模型即可使用。为了演示，本文将直接使用 Apple 开发者网站上提供的一个 Core ML 模型。闲话少说，下面开始学习 Core ML。</p>
<blockquote>
<p>注：本文要求使用 Xcode 9 beta 编写代码，还需要一个安装了 iOS 11 beta 的设备（译者注：也可使用 iOS 模拟器）用于测试文中实现的功能。虽然 Xcode 9 beta 同时支持 Swift 3.2 和 4.0，但文中所有的代码都使用了 Swift 4.0 编写。</p>
</blockquote>
<h1 id="什么是-Core-ML"><a href="#什么是-Core-ML" class="headerlink" title="什么是 Core ML"></a>什么是 Core ML</h1><blockquote>
<p>Core ML 使得开发者能够将各种各样的机器学习模型集成到应用程序中。它不仅仅支持超过 30 层的深度学习网络（extensive deep learning with over 30 layer types），它还支持如树集成、支持向量机和广义线性模型等标准模型。Core ML 基于像 Metal 和 Accelerate 这样的底层技术，因此它能够无缝地充分利用 CPU 和 GPU 以最大化性能和效率。机器学习模型可直接运行在设备上，这样一来，被分析的数据就不必离开设备了。</p>
</blockquote>
<p> <a href="https://developer.apple.com/machine-learning/" target="_blank" rel="noopener">关于 Core ML 的 Apple 官方文档</a></p>
<p>Core ML 是今年在 WWDC 上随着 iOS 11 发布的一个全新的机器学习框架。通过 Core ML，开发者可以直接将机器学习模型集成到应用程序中。那么什么是机器学习呢？简单地说，机器学习是赋予计算机学习能力的应用，而不用明确地对它编程。一个训练好的模型就是结合机器学习算法对一些数据集进行训练的结果。</p>
<p><img src="http://www.appcoda.com/wp-content/uploads/2017/06/trained-model.png" alt=""></p>
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<article id="post-NSMutableDictionary实现完全深拷贝" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<p>概念性的东西我们不讲了，我们都知道集合类的拷贝比较特殊，对集合类进行 <code>Deep Copy</code>其实并不是完整的深拷贝，只是拷贝了外面的容器，里面的指针并没有被拷贝。道理大家都懂，可平时用的少，前几天我就栽了个跟头，特此记录一下。</p>
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<p><strong>网上有现成的解决方案，特此解读</strong></p>
<ol>
<li>遍历字典中所有的键值对</li>
<li>如果还是字典，继续遍历轮询</li>
<li>不是字典，采取 <code>mutableCopy</code></li>
<li>无法执行 <code>Copy</code> 的需要进行特殊处理，例如 <code>UIImage</code></li>
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<a class="article-title" href="/2017/07/21/iOS11中使用CoreNFC/">iOS11中使用CoreNFC</a>
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<p><img src="http://okhqmtd8q.bkt.clouddn.com/iOS11%E4%B8%AD%E4%BD%BF%E7%94%A8CoreNFC/1.png" alt=""></p>
<p>在2017的<code>WWDC</code>,苹果终于发布了众多开发者期待已久的系统级框架 <code>CoreNFC</code>。可能你对于<code>NFC</code>是什么并不是很了解，简而言之，<code>NFC</code>（近场通信）就是当两台硬件设备相距<code>4cm</code>以内时可以实现互相通信。<code>NFC</code>在商业上的应用是把<code>NFC</code>芯片集成到各类卡片中，极大的加强安全性。目前 <code>CoreNFC</code> 只支持一种格式：<code>NFC Data Exchange Format</code>，简称<code>NDEF</code>(常被用于平板电脑和智能手机中)。</p>
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<article id="post-Obj-C灵魂-Runtime" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/07/12/Obj-C灵魂-Runtime/">Obj-C灵魂-Runtime</a>
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<p><code>Obj-C</code>之所以被称之为动态语言，完全是因为<code>Runtime</code>库，<code>Runtime</code>库是由<code>C语言</code>和<code>汇编语言</code>所写的，它在<code>C语言</code>的基础上，为<code>Obj-C</code>增加了面向对象的特征。同时借鉴<code>SmallTalk</code>增加了消息转发。说透彻了就是我们所写的所有<code>Obj-C</code>代码，都会通过<code>Runtime库</code>转换为<code>C语言</code>的代码。针对这么一个大家无时不刻都在使用的类库，是有必要深入了解一下的。</p>
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<h3 id="1-数据结构及常用名词解释"><a href="#1-数据结构及常用名词解释" class="headerlink" title="1.数据结构及常用名词解释"></a>1.数据结构及常用名词解释</h3><p>之所以开篇将一些数据的结构组成以及常用的名词解释，是为了大家在后续的过程中不会懵逼，咱们也不着急，那就一步步，踏踏实实的看。</p>
<h5 id="1-Class"><a href="#1-Class" class="headerlink" title="1.Class"></a>1.Class</h5><p> 我们通常所说的 <strong>Class</strong>，实际上是指向 <strong>objc_class</strong> 结构体的指针，<strong>objc_class</strong>在 <strong>objc_class</strong>里定义如下：</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">struct</span> objc_class {</span><br><span class="line"> Class isa; <span class="comment">// is a kind of的意思</span></span><br><span class="line"><span class="meta">#if !__OBJC2__</span></span><br><span class="line"> Class super_class; <span class="comment">// 获取父类</span></span><br><span class="line"> <span class="keyword">const</span> <span class="keyword">char</span> *name; <span class="comment">// 类名</span></span><br><span class="line"> <span class="keyword">long</span> version; <span class="comment">// 类的版本号</span></span><br><span class="line"> <span class="keyword">long</span> info; <span class="comment">// 理解为类的相关信息</span></span><br><span class="line"> <span class="keyword">long</span> instance_size; <span class="comment">// 实例的大小</span></span><br><span class="line"> <span class="keyword">struct</span> objc_ivar_list *ivars; <span class="comment">// 获取成员变量列表</span></span><br><span class="line"> <span class="keyword">struct</span> objc_method_list **methodLists; <span class="comment">// 获取方法列表</span></span><br><span class="line"> <span class="keyword">struct</span> objc_cache *cache; <span class="comment">// 方法缓存列表</span></span><br><span class="line"> <span class="keyword">struct</span> objc_protocol_list *protocols; <span class="comment">// 获取协议列表</span></span><br><span class="line"><span class="meta">#endif</span></span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取类名</span></span><br><span class="line"><span class="keyword">const</span> <span class="keyword">char</span> * class_getName ( Class <span class="keyword">class</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取父类</span></span><br><span class="line">Class class_getSuperclass ( Class <span class="keyword">class</span> );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 判断给定的Class是否是一个元类</span></span><br><span class="line"><span class="built_in">BOOL</span> class_isMetaClass ( Class <span class="keyword">class</span> );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取实例大小</span></span><br><span class="line">size_t class_getInstanceSize ( Class <span class="keyword">class</span> );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取类中指定名称实例成员变量的信息</span></span><br><span class="line">Ivar class_getInstanceVariable ( Class <span class="keyword">class</span>, <span class="keyword">const</span> <span class="keyword">char</span> *name );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取类成员变量的信息</span></span><br><span class="line">Ivar class_getClassVariable ( Class <span class="keyword">class</span>, <span class="keyword">const</span> <span class="keyword">char</span> *name );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 添加成员变量</span></span><br><span class="line"><span class="built_in">BOOL</span> class_addIvar ( Class <span class="keyword">class</span>, <span class="keyword">const</span> <span class="keyword">char</span> *name, size_t size, uint8_t alignment, <span class="keyword">const</span> <span class="keyword">char</span> *types );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取整个成员变量列表</span></span><br><span class="line">Ivar * class_copyIvarList ( Class <span class="keyword">class</span>, <span class="keyword">unsigned</span> <span class="keyword">int</span> *outCount );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 添加协议</span></span><br><span class="line"><span class="built_in">BOOL</span> class_addProtocol ( Class cls, Protocol *protocol );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 返回类是否实现指定的协议</span></span><br><span class="line"><span class="built_in">BOOL</span> class_conformsToProtocol ( Class cls, Protocol *protocol );</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取版本号</span></span><br><span class="line"><span class="keyword">int</span> class_getVersion ( Class cls );</span><br><span class="line"><span class="comment">// 设置版本号</span></span><br><span class="line"><span class="keyword">void</span> class_setVersion ( Class cls, <span class="keyword">int</span> version );</span><br></pre></td></tr></table></figure>
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<article id="post-KVO知识小结" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/07/06/KVO知识小结/">KVO知识小结</a>
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<a href="/2017/07/06/KVO知识小结/" class="archive-article-date">
<time datetime="2017-07-06T05:56:14.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-07-06</time>
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<h3 id="1-认识KVO"><a href="#1-认识KVO" class="headerlink" title="1.认识KVO"></a>1.认识KVO</h3><blockquote>
<p><code>KVO</code>类似于观察者模式，我们利用简单的代码来了解什么是<code>KVO</code>。</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 注册一个Person类</span></span><br><span class="line"><span class="meta">#import <span class="meta-string"><Foundation/Foundation.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">@interface</span> <span class="title">Person</span> : <span class="title">NSObject</span></span></span><br><span class="line"><span class="keyword">@property</span> (<span class="keyword">nonatomic</span>,<span class="keyword">copy</span>) <span class="built_in">NSString</span> *name;</span><br><span class="line"><span class="keyword">@end</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 再注册一个Dog类</span></span><br><span class="line"><span class="meta">#import <span class="meta-string"><Foundation/Foundation.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">@interface</span> <span class="title">Dog</span> : <span class="title">NSObject</span></span></span><br><span class="line"><span class="keyword">@property</span> (<span class="keyword">nonatomic</span>,<span class="keyword">copy</span> ) <span class="built_in">NSString</span> *name;</span><br><span class="line"><span class="keyword">@end</span></span><br></pre></td></tr></table></figure>
<p>我们在<code>ViewController</code>中引入头文件，并创建两个全局的属性。我们希望<code>Person</code>作为<code>Dog</code>的观察者，当<code>Dog</code>的<code>name</code>属性发生变化的时候，<code>Person</code>可以第一时间知道。这时我们就可以运用<code>KVO</code>的技术。</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"> Person *p = [Person new];</span><br><span class="line"> <span class="keyword">self</span>.p = p;</span><br><span class="line"> Dog *dog = [Dog new];</span><br><span class="line"> <span class="keyword">self</span>.dog = dog;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 成为其他对象的观察者要进行注册</span></span><br><span class="line"><span class="comment">// KeyPath代表监听对象的具体属性</span></span><br><span class="line"><span class="comment">// Observe就是观察者喽</span></span><br><span class="line"><span class="comment">// Options可以指定管擦得值得新旧等</span></span><br><span class="line"><span class="comment">// Context可以是任何对象，可以向观察者传递信息，也可以用指定的标识对不同的观察者进行区分</span></span><br><span class="line"> [dog addObserver:p</span><br><span class="line"> forKeyPath:<span class="string">@"name"</span></span><br><span class="line"> options:(<span class="built_in">NSKeyValueObservingOptionNew</span> | <span class="built_in">NSKeyValueObservingOptionOld</span>)</span><br><span class="line"> context:<span class="literal">nil</span>];</span><br><span class="line"></span><br><span class="line"> dog.name = <span class="string">@"旺财"</span>;</span><br></pre></td></tr></table></figure>
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<article id="post-KVC知识小结" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/06/17/KVC知识小结/">KVC知识小结</a>
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<time datetime="2017-06-17T02:15:31.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-06-17</time>
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<p>关于<code>KVC</code>和<code>KVO</code>,我之前的总结文章有写过，但是实际上我在平日工作里，<code>KVC</code>和<code>KVO</code>使用的相对较少，不是<code>KVC</code>和<code>KVO</code>的功能不够强大，这实际上和项目的架构有比较大的关系，以前的我对于<code>KVC</code>和<code>KVO</code>的使用也是趋于表面，没有探究其内部真正的实现原理和进阶用法，这次总结正好给了我很好的学习机会，在此深入的总结一下<code>KVC</code>和<code>KVO</code>吧。</p>
<blockquote>
<p><strong>KVC</strong>，即是指 <strong>NSKeyValueCoding</strong>，一个非正式的 <strong>Protocol</strong>，提供一种机制来间接访问对象的属性。<strong>KVO</strong> 就是基于 <strong>KVC</strong> 实现的关键技术之一。</p>
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<h3 id="KVC在iOS中的定义"><a href="#KVC在iOS中的定义" class="headerlink" title="KVC在iOS中的定义"></a>KVC在iOS中的定义</h3><p><code>Objective-C</code>中<code>KVC</code>的定义是对<code>NSObject</code>的扩展来实现的。所以对于所有继承了<code>NSObject</code>在类型，都可以使用<code>KVC</code>，下面是<code>KVC</code>最为重要的四个方法</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">- (<span class="keyword">nullable</span> <span class="keyword">id</span>)valueForKey:(<span class="built_in">NSString</span> *)key; <span class="comment">//直接通过Key来取值</span></span><br><span class="line">- (<span class="keyword">void</span>)setValue:(<span class="keyword">nullable</span> <span class="keyword">id</span>)value forKey:(<span class="built_in">NSString</span> *)key; <span class="comment">//通过Key来设值</span></span><br><span class="line">- (<span class="keyword">nullable</span> <span class="keyword">id</span>)valueForKeyPath:(<span class="built_in">NSString</span> *)keyPath; <span class="comment">//通过KeyPath来取值</span></span><br><span class="line">- (<span class="keyword">void</span>)setValue:(<span class="keyword">nullable</span> <span class="keyword">id</span>)value forKeyPath:(<span class="built_in">NSString</span> *)keyPath; <span class="comment">//通过KeyPath来设值</span></span><br></pre></td></tr></table></figure>
<p>一般来讲，<strong>Obj-C</strong> 对象中都会有一些属性。如代码所示</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#import <span class="meta-string"><Foundation/Foundation.h></span></span></span><br><span class="line"><span class="class"><span class="keyword">@interface</span> <span class="title">Person</span> : <span class="title">NSObject</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** name */</span></span><br><span class="line"><span class="keyword">@property</span> (<span class="keyword">nonatomic</span>,<span class="keyword">copy</span> ) <span class="built_in">NSString</span> *name;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** Address */</span></span><br><span class="line"><span class="keyword">@property</span> (<span class="keyword">nonatomic</span>,<span class="keyword">copy</span> ) <span class="built_in">NSString</span> *address;</span><br><span class="line"></span><br><span class="line"><span class="keyword">@end</span></span><br></pre></td></tr></table></figure>
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