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<a class="article-title" href="/2022/07/03/1_OC%E5%AF%B9%E8%B1%A1/">OC对象</a>
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<h2 id="1、OC的对象、类主要是C-C-的什么数据结构实现的?"><a href="#1、OC的对象、类主要是C-C-的什么数据结构实现的?" class="headerlink" title="1、OC的对象、类主要是C\C++的什么数据结构实现的?"></a>1、OC的对象、类主要是C\C++的什么数据结构实现的?</h2><ul>
<li> 结构体</li>
</ul>
<h2 id="2、把OC代码转换成c-代码"><a href="#2、把OC代码转换成c-代码" class="headerlink" title="2、把OC代码转换成c++代码"></a>2、把OC代码转换成c++代码</h2><ul>
<li> iPhone架构分类:</li>
</ul>
<table>
<thead>
<tr>
<th>模拟器</th>
<th>i386架构</th>
</tr>
</thead>
<tbody><tr>
<td>32bit真机</td>
<td>armv7</td>
</tr>
<tr>
<td>64bit真机</td>
<td>arm64</td>
</tr>
</tbody></table>
<ul>
<li><p>指令:</p>
<figure class="highlight plaintext"><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"> 直接转换:</span><br><span class="line"> clang -rewrite-objc main.m -o main.cpp</span><br><span class="line">iPhone平台转换:</span><br><span class="line">xcrun -sdk iphoneos clang -arch arm64 -rewrite-objc main.m -o main.cpp</span><br></pre></td></tr></table></figure></li>
<li><p>在main.cpp文件中,搜索NSObject_IMPL可以发现</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"> struct NSObject_IMPL {</span><br><span class="line"> Class isa; // 指针 8个字节</span><br><span class="line">};</span><br></pre></td></tr></table></figure></li>
<li><p>内存大小</p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">// 先导入头文件如下</span><br><span class="line">#import <Foundation/Foundation.h></span><br><span class="line">#import <objc/runtime.h></span><br><span class="line">#import <malloc/malloc.h></span><br><span class="line"></span><br><span class="line">int main(int argc, const char * argv[]) {</span><br><span class="line"> @autoreleasepool {</span><br><span class="line"> NSObject *obj = [[NSObject alloc] init];</span><br><span class="line"> </span><br><span class="line"> // 获取NSObject类的实例对象的大小</span><br><span class="line"> NSLog(@"实例对象的大小-%zd",class_getInstanceSize([NSObject class]));</span><br><span class="line"> </span><br><span class="line"> // 获取obj指针指向内存的大小</span><br><span class="line"> NSLog(@"指针指向内存的大小-%zd",malloc_size((__bridge const void *)(obj)));</span><br><span class="line"> </span><br><span class="line"> NSLog(@"Hello, World!");</span><br><span class="line"> </span><br><span class="line"> /**打印结果如下:</span><br><span class="line"> 2021-12-23 19:31:15.893600+0800 01-oc本质[1512:18220] 实例对象的大小-8</span><br><span class="line"> 2021-12-23 19:31:15.893932+0800 01-oc本质[1512:18220] 指针指向内存的大小-16</span><br><span class="line"> 2021-12-23 19:31:15.893962+0800 01-oc本质[1512:18220] Hello, World!</span><br><span class="line"> */</span><br><span class="line"> }</span><br><span class="line"> return 0;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>那么内存的大小到底是多少呢?</p>
</li>
<li><p>下载最新的苹果objc开源代码:<a target="_blank" rel="noopener" href="https://opensource.apple.com/tarballs/objc4/">https://opensource.apple.com/tarballs/objc4/</a></p>
</li>
<li><p>全局搜索“size_t instanceSize”,可以看到这段源码</p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">size_t instanceSize(size_t extraBytes) {</span><br><span class="line"> size_t size = alignedInstanceSize() + extraBytes;</span><br><span class="line"> // CF requires all objects be at least 16 bytes.</span><br><span class="line"> // 注释大概意思是说,所有的对象最少要16个字节</span><br><span class="line"> if (size < 16) size = 16;</span><br><span class="line"> return size;</span><br><span class="line"> }</span><br><span class="line"></span><br></pre></td></tr></table></figure></li>
</ul>
<p>**</p>
<h2 id=""><a href="#" class="headerlink" title=""></a></h2><h4 id="问题:一个NSObject对象占用多少内存?"><a href="#问题:一个NSObject对象占用多少内存?" class="headerlink" title="问题:一个NSObject对象占用多少内存?"></a>问题:一个NSObject对象占用多少内存?</h4><h5 id="1、系统分配了16个字节NSObject对象"><a href="#1、系统分配了16个字节NSObject对象" class="headerlink" title="1、系统分配了16个字节NSObject对象"></a>1、系统分配了16个字节NSObject对象</h5><h5 id="2、但是NSObject对象内部只使用了8个字节的空间"><a href="#2、但是NSObject对象内部只使用了8个字节的空间" class="headerlink" title="2、但是NSObject对象内部只使用了8个字节的空间"></a>2、但是NSObject对象内部只使用了8个字节的空间</h5><p>**</p>
<h2 id="3、进一步窥探内存细节"><a href="#3、进一步窥探内存细节" class="headerlink" title="3、进一步窥探内存细节"></a>3、进一步窥探内存细节</h2><ul>
<li>运行XCode,打断点</li>
<li>设置– Debug–> Debug Workflow –> Always Show Disassembly</li>
<li>把对象地址打印出来,可以发现只有前面8个字节有内容,后面8个字节是空的</li>
</ul>
<p><img src="https://img-blog.csdnimg.cn/1d9cc8268a5949b5a9d657855426365a.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBASkhfQ2Fv,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p>
<h2 id="4、通过LLDB指令窥探细节"><a href="#4、通过LLDB指令窥探细节" class="headerlink" title="4、通过LLDB指令窥探细节"></a>4、通过LLDB指令窥探细节</h2><ul>
<li>常用LLDB指令</li>
<li>(大小端模式)苹果一般是小端模式:<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"> 2019 = 2*10^3+0*10^2+1*10^1+9*10^0</span><br><span class="line">可以称高位对应的权重(10^3)大,低位对应的权重小。</span><br></pre></td></tr></table></figure>
小端就是先存储权重小的,大端就是先存储权重大的<br>举例:0x1234<br>不要记忆高地址,低地址,看下图<br>(或者记住:正常人写阿拉伯数字就是大端模式,从左往右开始写)<br>从左到右,地址从低到高</li>
</ul>
<table>
<thead>
<tr>
<th>小端模式</th>
<th>4</th>
<th>3</th>
<th>2</th>
<th>1</th>
</tr>
</thead>
<tbody><tr>
<td>大端模式</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
<tr>
<td>–</td>
<td>低地址</td>
<td>–</td>
<td>–</td>
<td>高地址</td>
</tr>
</tbody></table>
<figure class="highlight plaintext"><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><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"> </span><br><span class="line"> </span><br><span class="line"> -- print、p : 打印</span><br><span class="line"> -- po : 打印对象</span><br><span class="line">-- 读取内存</span><br><span class="line"> 1、mermory read/数量+格式+字节数 内存地址</span><br><span class="line"> 例如:x/3xw 0x10010</span><br><span class="line"> </span><br><span class="line"> 修改内存中的值</span><br><span class="line"> memory write 内存地址 数值</span><br><span class="line"> mermory write 0x00000010 10</span><br><span class="line">/*</span><br><span class="line">(lldb) memory read 0x0000000100605230</span><br><span class="line">0x100605230: 89 50 60 80 ff ff 1d 01 00 00 00 00 00 00 00 00 .P`.............</span><br><span class="line">0x100605240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................</span><br><span class="line">(lldb) memory write 0x0000000100605234 7 </span><br><span class="line">(lldb) memory read 0x0000000100605230</span><br><span class="line">0x100605230: 89 50 60 80 07 ff 1d 01 00 00 00 00 00 00 00 00 .P`.............</span><br><span class="line">0x100605240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................</span><br><span class="line"></span><br><span class="line">可以看到内存值由 89 50 60 80 ff</span><br><span class="line">改为了 89 50 60 80 07 </span><br><span class="line">*/</span><br><span class="line"> 2、格式:x 16进制, f 浮点数, d 10进制</span><br><span class="line"> 3、字节大小:</span><br><span class="line"> b: byte 1字节</span><br><span class="line"> h: half word 2字节</span><br><span class="line"> w: word 4字节</span><br><span class="line"> g: giant word 8字节</span><br><span class="line"> </span><br><span class="line"> /* 打印结果</span><br><span class="line">(lldb) p obj</span><br><span class="line">(NSObject *) $1 = 0x0000000100605230</span><br><span class="line">(lldb) po obj</span><br><span class="line"><NSObject: 0x100605230></span><br><span class="line"></span><br><span class="line">(lldb) memory read 0x0000000100605230</span><br><span class="line">0x100605230: 89 50 60 80 ff ff 1d 01 00 00 00 00 00 00 00 00 .P`.............</span><br><span class="line">0x100605240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................</span><br><span class="line">(lldb) x 0x0000000100605230</span><br><span class="line">0x100605230: 89 50 60 80 ff ff 1d 01 00 00 00 00 00 00 00 00 .P`.............</span><br><span class="line">0x100605240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................</span><br><span class="line">(lldb) x/3xg 0x0000000100605230</span><br><span class="line">0x100605230: 0x011dffff80605089 0x0000000000000000</span><br><span class="line">0x100605240: 0x0000000000000000</span><br><span class="line">(lldb) x/3xh 0x0000000100605230</span><br><span class="line">0x100605230: 0x5089 0x8060 0xffff</span><br><span class="line">(lldb) x/3xw 0x0000000100605230</span><br><span class="line">0x100605230: 0x80605089 0x011dffff 0x00000000</span><br><span class="line">(lldb) x/3xb 0x0000000100605230</span><br><span class="line">0x100605230: 0x89 0x50 0x60</span><br><span class="line">(lldb) x/4xw 0x0000000100605230</span><br><span class="line">0x100605230: 0x80605089 0x011dffff 0x00000000 0x00000000</span><br><span class="line">(lldb) x/4dw 0x0000000100605230</span><br><span class="line">0x100605230: -2141171575</span><br><span class="line">0x100605234: 18743295</span><br><span class="line">0x100605238: 0</span><br><span class="line">0x10060523c: 0</span><br><span class="line">(lldb) x/4fw 0x0000000100605230</span><br><span class="line">0x100605230: -8.8450982E-39</span><br><span class="line">0x100605234: 2.9020014E-38</span><br><span class="line">0x100605238: 0</span><br><span class="line">0x10060523c: 0</span><br><span class="line">(lldb) </span><br><span class="line">*/</span><br></pre></td></tr></table></figure>
<h2 id="5、注意的地方"><a href="#5、注意的地方" class="headerlink" title="5、注意的地方"></a>5、注意的地方</h2><figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">定义这样一个类</span><br><span class="line">@interface Student : NSObject</span><br><span class="line">{</span><br><span class="line"> @public</span><br><span class="line"> int _no;</span><br><span class="line"> int _age;</span><br><span class="line"> int _height;</span><br><span class="line">}</span><br><span class="line">@end</span><br><span class="line"></span><br><span class="line">@implementation Student</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">@end</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">int main(int argc, const char * argv[]) {</span><br><span class="line"> @autoreleasepool {</span><br><span class="line"> NSLog(@"%zd", sizeof(struct Student_IMPL)); // 打印结果24</span><br><span class="line"> </span><br><span class="line"> Student *stu = [[Student alloc] init];</span><br><span class="line"> </span><br><span class="line"> NSLog(@"%zd", class_getInstanceSize([Student class])); // 打印结果24</span><br><span class="line"> NSLog(@"%zd", malloc_size((__bridge const void *)(stu))); // 打印结果32</span><br><span class="line"> }</span><br><span class="line"> return 0;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>分配给stu对象的内存是32,实际使用的是24</li>
<li>因为在iOS系统里面,给对象分配的最少内存单位是16,所以说,对象的内存大小是16的倍数</li>
</ul>
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<article id="post-iOS-Design-Mode" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2022/07/03/iOS-Design-Mode/">iOS设计模式浅谈</a>
</h1>
<a href="/2022/07/03/iOS-Design-Mode/" class="archive-article-date">
<time datetime="2022-07-03T14:29:09.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2022-07-03</time>
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<p>个人浅见,有误请指出,轻喷,谢谢~</p>
<ul>
<li><p>前言</p>
<ol>
<li>iOS设计模式中,常见的有MVC,MVP,MVVM,VIPER,SO这几种设计模式网上各有说法,浅谈一下个人浅见 。</li>
<li>本篇主要学习使用VIPER设计模式来做一个demo</li>
<li>(本人以前喜欢玩DOTA2,一看到Viper,就想到一个英雄,叫蝮蛇,Viper翻译过来也是蝮蛇,毒蛇的意思。)</li>
<li>这种设计模式学习成本较大,但是这种架构也是很厉害,就像毒蛇一样,对于大型项目,就像蟒蛇吞象一样,或者说,VIPER更适合于大型项目,个人就给VIPER设计模式取个中文名叫–”蝮蛇”</li>
<li>SO - Serveice Oriented(面向服务设计模式)</li>
</ol>
<h5 id="1-MVC(50余年历史)"><a href="#1-MVC(50余年历史)" class="headerlink" title="1. MVC(50余年历史)"></a>1. MVC(50余年历史)</h5><ul>
<li>优点:小项目中,层次分明,架构精简</li>
<li>缺点:大项目中,ViewController臃肿,逻辑混乱,难以维护</li>
<li>总结一句话比喻其优缺点:ViewController又当爹,又当妈,孩子还小的时候,还能负担的起,也方便;孩子一旦大了,ViewController要累死了</li>
</ul>
</li>
</ul>
<img width="778" alt="image" src="https://user-images.githubusercontent.com/18459414/176925795-52fd3168-060c-4d0b-ac32-b73173ad1c94.png">
<pre><code> 苹果官方推荐的设计模式,个人认为适用于小型的APP。
在当下内卷严重的时代,APP功能也越来越卷,我觉得MVC已经不太适合了。
但是其思想还是值得我们进一步学习和思考的。
</code></pre>
<h5 id="2-MVVM(40余年历史)"><a href="#2-MVVM(40余年历史)" class="headerlink" title="2. MVVM(40余年历史)"></a>2. MVVM(40余年历史)</h5><ul>
<li>优点:剥离了一部分ViewController中的View相关的处理逻辑</li>
<li>缺点:<ol>
<li>View的可复用性变差</li>
<li>单元测试难以编写</li>
<li>违背单一职责设计原则<br>总结一句话比喻其优缺点:厨房的抽屉很乱,我让你去打扫,你却把上面的抽屉里的部分垃圾,倒入下面一层抽屉里去了,然后你跟我说你打扫了抽屉</li>
</ol>
</li>
</ul>
<img width="801" alt="image" src="https://user-images.githubusercontent.com/18459414/176926989-1e5d1e6f-93de-4cb1-8459-3b7e3578ec95.png">
<pre><code> 当大家发现MVC的臃肿,就会想办法把ViewController中的View相关逻辑抽离出来
实际上,到最后会发现,治标不治本。
</code></pre>
<h5 id="3-MVP(17余年历史)"><a href="#3-MVP(17余年历史)" class="headerlink" title="3. MVP(17余年历史)"></a>3. MVP(17余年历史)</h5><ul>
<li>优点:加强了presenter的地位,降低了ViewController的地位,也就意味着,减轻了ViewController的大部分业务逻辑</li>
<li>缺点:ViewController仍然要处理大部分View相关的视图逻辑,在复杂度剧增的APP时代,ViewController依然容易超过上千行代码。</li>
</ul>
<img width="787" alt="image" src="https://user-images.githubusercontent.com/18459414/176929574-98722734-9ae7-4b31-ab07-3fb9f23edd72.png">
<h5 id="4-VIPER(10余年历史)"><a href="#4-VIPER(10余年历史)" class="headerlink" title="4. VIPER(10余年历史)"></a>4. VIPER(10余年历史)</h5><p>先阐述一下相关名词意思</p>
<p>V:View(视图)<br>I:Interactor(沟通者)<br>P:Presenter(主持者)<br>E:Entity(数据实体)<br>R:Router(路由器)</p>
<ul>
<li>优点:</li>
</ul>
<ol>
<li>层次更加分明</li>
<li>更加符合单一职责原则</li>
<li>高解耦、低耦合,易于维护</li>
<li>可复用性强</li>
</ol>
<ul>
<li>缺点:</li>
</ul>
<ol>
<li>上手成本高</li>
<li>对于小项目来说,不符合这种架构,分工太多,有点得不偿失的感觉<img width="755" alt="image" src="https://user-images.githubusercontent.com/18459414/176932726-5bbb1d74-de87-4672-bbbe-9c15e6efc358.png"></li>
</ol>
<h5 id="5-SO(5年历史-https-tech-glowing-com-cn-service-oriented-ios-architecture-)"><a href="#5-SO(5年历史-https-tech-glowing-com-cn-service-oriented-ios-architecture-)" class="headerlink" title="5. SO(5年历史-https://tech.glowing.com/cn/service-oriented-ios-architecture/)"></a>5. SO(5年历史-<a target="_blank" rel="noopener" href="https://tech.glowing.com/cn/service-oriented-ios-architecture/%EF%BC%89">https://tech.glowing.com/cn/service-oriented-ios-architecture/)</a></h5><ul>
<li>优点:在研究中</li>
<li>缺点:在研究中</li>
<li>架构图:在研究中</li>
</ul>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录(注意不是yilia根目录)执行以下命令:<br/> npm i hexo-generator-json-content --save<br/><br/>
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