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<a class="post-title-link" href="/2018/02/28/TODO/" itemprop="url">博客的排期</a></h1>
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<h1 id="更新日期"><a href="#更新日期" class="headerlink" title="更新日期"></a>更新日期</h1><p>2018-06-25 20:35</p>
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<th>已完成排期</th>
<th>博客内容</th>
<th>优先级</th>
<th>预估日期</th>
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<td>已完成</td>
<td>OC实现弱引用容器</td>
<td>⭐️⭐️⭐️</td>
<td>2018-03</td>
</tr>
<tr>
<td>已完成</td>
<td>iOS中多代理的实现</td>
<td>⭐️⭐️⭐️</td>
<td>2018-03</td>
</tr>
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<h1 id="排期列表"><a href="#排期列表" class="headerlink" title="排期列表"></a>排期列表</h1><table>
<thead>
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<th>编写状态</th>
<th>博客内容</th>
<th>优先级</th>
<th>大约完成期限</th>
</tr>
</thead>
<tbody>
<tr>
<td>未开始</td>
<td>iOS中的加密方式比较</td>
<td>⭐⭐</td>
<td>2018-7月</td>
</tr>
<tr>
<td>延期</td>
<td>对于iOS多线程的理解</td>
<td>⭐️</td>
<td>–</td>
</tr>
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<p>本想写一篇关于iOS多线程的文章，但是过了一段时间后发现自己对多线程的理解并不到位，<br>所以现在就不误人子弟了，先延期处理，等什么时候有自信了再来写。</p>
<p>这段时间有些忙，对于后面的文章安排还没有太多想法，所以等有了想法再更新排期。</p>
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<td>⭐️⭐️⭐️</td>
<td>最优先，有时间就会写</td>
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<tr>
<td>⭐️⭐️</td>
<td>一般，会先完成三星优先级的编写</td>
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<tr>
<td>⭐️</td>
<td>最低级别，其他的全写完才会写，也有可能被放弃</td>
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<a class="post-title-link" href="/2018/06/25/2018-06-25_objc_msgSend/" itemprop="url">objc_msgSend() 函数正确的使用方法</a></h1>
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<p>前天发了一个版本，从bugly监控发现频繁崩溃，崩溃类型是：SIGSEGV,由于忘记留’dSYM’文件，导致崩溃信息里面得到的信息很少(血的教训，发版一定要留’dSYM’文件!!),后来只能重新打了一个包，重现崩溃才找到bug，竟然是objc_msgSend()用错了，而且在这之前一直这么错着用！！！</p>
<p>objc_msgSend() 是OC runtime里面很重要的一个函数，用来发送消息，可以解决performSelector:方法最多只能传递两个参数的问题，所以runtime刚入门的人就喜欢用这个函数，但是没有真正理解其用法，比如我。</p>
<p>函数背后的原理和更深入的东西我就不说了，毕竟我也不会，只把函数的用法规则重新学习一下：<br><figure class="highlight plain"><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">// 正常方法：</span><br><span class="line">- (void)testMethod;</span><br><span class="line">// 使用objc_msgSend()</span><br><span class="line">objc_msgSend(self , @selector(testMethod));</span><br></pre></td></tr></table></figure></p>
<p>但是以上写法是错误的，因为以上写法没有定义函数原型<br>正确的是以下写法：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">((void(*) (id,SEL))objc_msgSend)(self, @selector(testMethod));</span><br></pre></td></tr></table></figure></p>
<p><img src="http://o8prfm9ji.bkt.clouddn.com/QQ20180625-194336.png" alt="函数原型分解"><br>
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<a class="post-title-link" href="/2018/06/25/2018-06-25_Xcode_10_beta_Error/" itemprop="url">Xcode 10 打开工程提示"Info.plist文件"错误的解决方法</a></h1>
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<p>因为要查找iOS12 崩溃问题，所以装了个Xcode10 beta2，但是打开工程后报类似以下的编译错误：<br><figure class="highlight plain"><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">Showing Recent Messages</span><br><span class="line">:-1: Multiple commands produce '/Users/xxx/Library/Developer/Xcode/DerivedData/xx/xx/xx.app/Info.plist':</span><br><span class="line">1) Target 'xxx' has copy command from '/Users/xxx/Desktop/xxxx/Supporting Files/Info.plist' to '/Users/xxx/Library/Developer/Xcode/DerivedData/xxx/xx/xx.app/Info.plist'</span><br><span class="line">2) Target 'xxx' has process command with input '/Users/xxx/Desktop/xxx/Supporting Files/Info.plist'</span><br></pre></td></tr></table></figure></p>
<p>百度了以下，发现出现这样问题的情况还挺多，但是都没有给出准确的解决办法<br>经过摸索，我找到一个解决办法：</p>
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<p>进入’Build Phases’ -> ‘Copy Bundle Resources’ ,然后找到’Info.plist’并删掉</p>
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<a class="post-title-link" href="/2018/06/06/2018-06-06_weakContainer/" itemprop="url">OC中的弱引用容器</a></h1>
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<p>PS: 本来打算三月就完成这两篇博客，但是因为换工作比较忙，一直到现在才有时间更新。</p>
<h1 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h1><p>OC 中常见的容器都是强引用的，比如NSArray,NSDictary,NSSet等，但是我们偶尔也需要一个弱引用的容器。<br>目前我了解到的比较成熟并且容易实现的方法有两个：</p>
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<a class="post-title-link" href="/2018/06/06/2018-06-06_moreDelegate/" itemprop="url">OC 中多代理的实现</a></h1>
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<h1 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h1><p>iOS 中有个设计模式叫单例模式，还有个模式叫代理模式，<br>如果想在单例中添加代理就不能像之前那样直接赋值，<br>那样只有最后一个代理生效，所以就有了多代理的需求</p>
<h2 id="实现方式"><a href="#实现方式" class="headerlink" title="实现方式"></a>实现方式</h2><p>多代理实现的关键就在于如何管理多个代理，代理也是对象，我们可以用数组装载起来，但是直接放在数组会影响代理对象的销毁。<br>所以这就需要一个弱引用的容器，将多个代理加入到弱引用容器中，在需要通知代理的地方遍历容器，分别去通知各代理。<br>(关于弱引用容器可以参考我的上篇文章<a href="http://ghostlord.site/2018/06/06/2018-06-06_weakContainer/">OC中的弱引用容器</a>)</p>
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