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<h1 class="post-title"><a class="post-link" href="/2020/03/22/issue-reflect-200322/">记一次线上故障处理及思考</a>
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2020-03-22
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<div class="post-content"><p>下午正在翻看刚刚读过的一本书，业务群里报了个线上的问题，紧急修复了之后测试、部署上线。<br>乍一看，出现问题的点在一个长达 171 行的方法中，出错的原因是在对一个 map 变量操作之前没有正确赋值。但仔细看来，这段代码已经开始有些坏味道了。<br>核心的问题是：<strong>逻辑复杂，方法过长</strong>。</p>
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2020-03-15
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<div class="post-content"><h2 id="1-概述"><a href="#1-概述" class="headerlink" title="1.概述"></a>1.概述</h2><p>什么是反射？反射是程序能够查看自身结构、类型、甚至能够操纵自身的能力，是元编程的一种形式。</p>
<p>我们说某个语言具有元编程的能力，通常分成两类：</p>
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<li>一类是宏，即在编译期生成代码，比如C；</li>
<li>另一类是在运行时修改代码的行为，比如 Objective-C，比如 Golang。</li>
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<p>Go 通过 reflect 库提供了在运行时操控数据的能力，就是后面的一种。本篇将结合 reflect 库来讲解 Go 是如何提供反射的功能、并为我们的开发提供便利的。</p>
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2020-02-23
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<div class="post-content"><h2 id="Semantic-Versioning-2-0-0"><a href="#Semantic-Versioning-2-0-0" class="headerlink" title="Semantic Versioning 2.0.0"></a>Semantic Versioning 2.0.0</h2><p>在软件管理的版本控制中，存在一个可怕的领域，名为<del>“手冢领域”</del>“依赖地狱”，为了解决这个问题，<a href="https://tom.preston-werner.com/" target="_blank" rel="external">Tom Preston-Werner</a> 提出了一组简单的规则来明确版本号应该如何指定和增加，这个系统就叫做 <a href="https://semver.org/" target="_blank" rel="external">“Semantic Versioning”</a>。</p>
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<h1 class="post-title"><a class="post-link" href="/2020/01/30/oop-in-golang/">Go 的面向对象编程</a>
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<span class="post-time">
2020-01-30
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<div class="post-content"><p>在我的印象中，正经而严肃认真地看“面向对象”这个概念，有这么几次：第一次，是大学时老师上课讲的，Car和Taxi，Animal和Dog、Cat，Teacher和Student，如此如此；第二次，是在臧成威老师的 iOS 黑魔法课中，学习如何用 C 语言实现面向对象的各种特性；第三次，应该就是最近，在学习设计模式中遇到最形而上之、又被最广泛使用的编程思想——面向对象。这一次，就从我写后端以来最常用的语言 Go 入手，研究一下它是如何体现面向对象思想、日常开发中又是如何使用 Go 进行面向对象编程的吧。</p>
<h2 id="使用-Go-如何实现面向对象编程？"><a href="#使用-Go-如何实现面向对象编程？" class="headerlink" title="使用 Go 如何实现面向对象编程？"></a>使用 Go 如何实现面向对象编程？</h2><p>首先，第一个问题是：“Go 是一门面向对象的语言吗？”</p>
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<h1 class="post-title"><a class="post-link" href="/2019/12/19/from-proto-to-go/">从 .proto 到 .pb.go</a>
</h1>
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<span class="post-time">
2019-12-19
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<div class="post-content"><p>proto buffer在平时开发中使用很多，比如下面这个，就是一个最简单的 .proto 文件：<br><figure class="highlight protobuf"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line">syntax = <span class="string">"proto3"</span>;</div><div class="line"></div><div class="line"><span class="keyword">package</span> demopb;</div><div class="line"></div><div class="line"><span class="class"><span class="keyword">service</span> <span class="title">Demo</span> </span>{</div><div class="line"> <span class="function"><span class="keyword">rpc</span> Hello (HelloRequest) <span class="keyword">returns</span> (HelloResponse) {}</span></div><div class="line">}</div><div class="line"></div><div class="line">message HelloRequest {</div><div class="line"> string name = 1;</div><div class="line"> <span class="built_in">string</span> greeting = <span class="number">2</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="class"><span class="keyword">message</span> <span class="title">HelloResponse</span> </span>{</div><div class="line"> <span class="built_in">string</span> name = <span class="number">1</span>;</div><div class="line"> <span class="built_in">string</span> greeting = <span class="number">2</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>那么它是如何从 .proto 转化成我们可以直接调用的 .go 文件呢？我们接下来依次拆解这几部分：</p>
<ol>
<li>package</li>
<li>message</li>
<li>field</li>
<li>service</li>
</ol>
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<h1 class="post-title"><a class="post-link" href="/2017/10/26/WWDC-2017-412-Auto-Layout-Techniques-in-IB/">WWDC 2017-412: Auto Layout Techniques in Interface Builder</a>
</h1>
<div class="post-meta">
<span class="post-time">
2017-10-26
</span></div>
</header>
<div class="post-content"><p>Here’s a summary for WWDC 2017, Session 412: Auto Layout Techniques in Interface Builder<br><a href="https://developer.apple.com/videos/play/wwdc2017/412/" target="_blank" rel="external">https://developer.apple.com/videos/play/wwdc2017/412/</a></p>
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<h1 class="post-title"><a class="post-link" href="/2017/06/29/memory-management-with-ARC/">iOS的内存管理之ARC部分总结</a>
</h1>
<div class="post-meta">
<span class="post-time">
2017-06-29
</span></div>
</header>
<div class="post-content"><p>在《Objective-C高级编程：iOS与OS X多线程和内存管理》一书中，对于ARC的部分有详尽的讲解。我将这一部分整理成思维导图，算是一个归档吧。</p>
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<h1 class="post-title"><a class="post-link" href="/2017/06/28/copy/">关于copy的常见问题</a>
</h1>
<div class="post-meta">
<span class="post-time">
2017-06-28
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<div class="post-content"><h3 id="1-property中的copy关键字如何使用？"><a href="#1-property中的copy关键字如何使用？" class="headerlink" title="1.@property中的copy关键字如何使用？"></a>1.<code>@property</code>中的<code>copy</code>关键字如何使用？</h3><ul>
<li>对于<code>NSString</code>、<code>NSArray</code>、<code>NSDictionary</code>而言：见下面几个问题的回答。</li>
<li>对于block而言：需要使用<code>copy</code>是为了在原有上下文范围外，继续追踪它捕获的状态。在使用ARC的时候不需要担心这个问题，因为是自动进行的，但是最佳实践是为property属性标记上这个必然的行为（即，添加上copy关键字）。</li>
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<h1 class="post-title"><a class="post-link" href="/2017/05/30/issue-of-lazy-loading-property/">Issue of lazy loading property</a>
</h1>
<div class="post-meta">
<span class="post-time">
2017-05-30
</span></div>
</header>
<div class="post-content"><p>I’ve got some <code>readonly</code> properties in my .h file. And when I tried to lazy loading them as usual like this.<br><figure class="highlight sqf"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// MyView.h</span></div><div class="line">@property (nonatomic, strong, readonly) UIImageView *imageView;</div><div class="line"></div><div class="line"><span class="comment">// MyView.m</span></div><div class="line">- (UIImageView *)imageView</div><div class="line">{</div><div class="line"> <span class="keyword">if</span> (!<span class="variable">_imageView</span>)</div><div class="line"> {</div><div class="line"> <span class="variable">_imageView</span> = [UIImageView new];</div><div class="line"> <span class="variable">_imageView</span>.translatesAutoresizingMaskIntoConstraints = NO;</div><div class="line"> <span class="variable">_imageView</span>.backgroundColor = [UIColor clearColor];</div><div class="line"> <span class="variable">_imageView</span>.contentMode = UIViewContentModeScaleAspectFit;</div><div class="line"> <span class="variable">_imageView</span>.userInteractionEnabled = NO;</div><div class="line"> <span class="variable">_imageView</span>.accessibilityIdentifier = @<span class="string">"empty set image view"</span>;</div><div class="line"></div><div class="line"> <span class="variable">_imageView</span>.<span class="built_in">image</span> = <span class="variable">_defaultImage</span>;</div><div class="line"></div><div class="line"> [<span class="variable">_contentView</span> addSubview:<span class="variable">_imageView</span>];</div><div class="line"> }</div><div class="line"> return <span class="variable">_imageView</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>Then…bang! It threw out errors in bulk, yelling “Use of undeclared identifier ‘_imageView’”. What the hell have I done!</p>
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