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<meta property="og:site_name" content="钟晴">
<meta property="og:description" content="iOS面试题 Object-C部分Object-C 基础题1、NSSet 一般用什么关键字修饰。为什么？2、浅拷贝和深拷贝的区别？浅拷贝：只复制指向对象的指针，而不复制引用对象本身。深拷贝：复制引用对象本身。内存中存在了两份独立对象本身，当修改A时，A_copy不变。 3、使用Block时需要注意哪些问题。 在block内部使用外部指针且会造成循环引用情况下，需要用__weak修饰外部指针： __">
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<meta property="og:updated_time" content="2020-04-28T01:48:15.547Z">
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<meta name="twitter:title" content="iOS面试题Object-C部分">
<meta name="twitter:description" content="iOS面试题 Object-C部分Object-C 基础题1、NSSet 一般用什么关键字修饰。为什么？2、浅拷贝和深拷贝的区别？浅拷贝：只复制指向对象的指针，而不复制引用对象本身。深拷贝：复制引用对象本身。内存中存在了两份独立对象本身，当修改A时，A_copy不变。 3、使用Block时需要注意哪些问题。 在block内部使用外部指针且会造成循环引用情况下，需要用__weak修饰外部指针： __">
Expand Down Expand Up @@ -449,13 +449,25 @@ <h1 class="post-title" itemprop="name headline">iOS面试题Object-C部分



<time title="Created: 2020-04-21 14:59:53 / Modified: 15:02:45" itemprop="dateCreated datePublished" datetime="2020-04-21T14:59:53+08:00">2020-04-21</time>
<time title="Created: 2020-04-21 14:59:53" itemprop="dateCreated datePublished" datetime="2020-04-21T14:59:53+08:00">2020-04-21</time>







<span class="post-meta-divider">|</span>


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<span class="post-meta-item-text">Edited on</span>

<time title="Modified: 2020-04-28 09:48:15" itemprop="dateModified" datetime="2020-04-28T09:48:15+08:00">2020-04-28</time>


</span>

Expand Down Expand Up @@ -554,7 +566,14 @@ <h5 id="15、有哪些常见的Crash场景"><a href="#15、有哪些常见的Cra
<li>访问了不存在的方法</li>
<li>数组越界</li>
</ol>
<h5 id="16、说一下静态库和动态库之间的区别"><a href="#16、说一下静态库和动态库之间的区别" class="headerlink" title="16、说一下静态库和动态库之间的区别"></a>16、说一下静态库和动态库之间的区别</h5><h5 id="17、使用atomic一定是线程安全的吗？"><a href="#17、使用atomic一定是线程安全的吗？" class="headerlink" title="17、使用atomic一定是线程安全的吗？"></a>17、使用atomic一定是线程安全的吗？</h5><p>不一定。只有在执行setter或getter方法时是线程安全的。</p>
<h5 id="16、说一下静态库和动态库之间的区别"><a href="#16、说一下静态库和动态库之间的区别" class="headerlink" title="16、说一下静态库和动态库之间的区别"></a>16、说一下静态库和动态库之间的区别</h5><p><strong>动态库形式：</strong>.dylib 和 .framework</p>
<p><strong>静态库形式：</strong>.a和.framework</p>
<p><strong>区别：</strong></p>
<ul>
<li>静态库：链接时，静态库会被完整的复制到可执行文件中</li>
<li>系统动态库：链接时不复制，程序运行时有系统动态加载到内存，提供内存掉用，系统只加载一次，多个程序共用，节省内存。</li>
</ul>
<h5 id="17、使用atomic一定是线程安全的吗？"><a href="#17、使用atomic一定是线程安全的吗？" class="headerlink" title="17、使用atomic一定是线程安全的吗？"></a>17、使用atomic一定是线程安全的吗？</h5><p>不一定。只有在执行setter或getter方法时是线程安全的。</p>
<h5 id="18、什么是-KVO-和-KVC？"><a href="#18、什么是-KVO-和-KVC？" class="headerlink" title="18、什么是 KVO 和 KVC？"></a>18、什么是 KVO 和 KVC？</h5><p>KVC(key-value-coding)键值编码，是一种间接访问实例变量的方法。提供一种机制来间接访问对象的属性</p>
<p>KVO是一种基于KVC实现的观察者模式。当指定的被观察的对象的属性更改了，KVO会以自动或手动方式通知观察者。</p>
<h5 id="19-堆、栈"><a href="#19-堆、栈" class="headerlink" title="19 堆、栈"></a>19 堆、栈</h5><p>栈：由系统管理分配和释放。一般存放函数的参数值，和局部变量（函数中的基本数据类型）。栈区的操作方式类似数据结构中的栈（先进后出）</p>
Expand Down Expand Up @@ -742,7 +761,7 @@ <h3 id="实战应用相关的题目"><a href="#实战应用相关的题目" clas

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