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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] 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/*!
* Marp / Marpit Gaia theme.
*
* @theme gaia
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
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slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-class="lead" data-theme="gaia" class="lead" data-marpit-pagination="1" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--class:lead;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:60%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/overview-hero@2x.png");background-size:95%;"></figure></div></section></foreignObject><foreignObject width="40%" height="720"><section id="1" data-paginate="true" data-background-color="#fff" data-class="lead" data-theme="gaia" class="lead" data-marpit-pagination="1" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--class:lead;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:60%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>iOS智能应用开发</h1>
<h2>UIKit与MVC</h2>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section class="lead" style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="1" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="2" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:40%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/sdk.png");background-size:80%;"></figure></div></section></foreignObject><foreignObject width="60%" height="720"><section id="2" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="2" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:40%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>正式开始iOS应用开发</h1>
<ul>
<li>
<p>应用开发使用iOS开发工具包</p>
</li>
<li>
<p>开发工具包（SDK）包含开发、安装、运行和测试iOS操作系统之上的应用软件所需的工具和接口</p>
<ul>
<li>工具: Xcode集成开发环境、 模拟器和开发文档等</li>
<li>接口: 供App调用的程序库和资源，称之为框架（Frameworks）</li>
</ul>
</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="2" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="3" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/0/frameworks.jpg");background-size:90%;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="3" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="3" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>Frameworks</h1>
<p>整个iOS系统的上百个Frameworks被划分为多层。</p>
<p>下层包含基本服务和技术。高层次的层建立在较低的层，并提供更复杂的服务和技术。</p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="3" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="4" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:60%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/0/coreframework.png");background-size:60%;"></figure></div></section></foreignObject><foreignObject width="40%" height="720"><section id="4" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="4" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:60%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>核心框架</h1>
<p>初级阶段的开发所涉及iOS系统功能基本全部集中与<strong>UIKit</strong>和<strong>Foundation</strong>两个框架之上。</p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="4" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="5" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h2>UIKit 框架</h2>
<ul>
<li>
<p>其中UIKit 框架(UIKit.framework) 提供了开发图形化事件驱动iOS App的基础设施，包括</p>
<ul>
<li>基本应用管理/用户界面管理</li>
<li>视图控制器和视图</li>
<li>触摸和运动事件</li>
<li>多任务、打印、通知等机制</li>
<li>动画效果、内容分享等<br />
……</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="6" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/projectnav.png");background-size:60%;"></figure><figure style="background-image:url("./images/2/model_view_controller_2x.png");background-size:80%;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="6" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="content">
<h1>Model-View-Controller: App基本结构</h1>
<p><br /><br /><br /><br /><br /><br /><br /><br />
<a href="https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">https://en.wikipedia.org/wiki/Model–view–controller</a></p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="6" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="7" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/1/IBActionOutlet.png");background-size:99%;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="7" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="7" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>控制器与视图：两类关联</h1>
<ul>
<li>把Button拖到changeLabel()函数上，让Button上发生的事件跟函数执行关联（一号关联）</li>
<li>把Label拖动到代码中生成了一个变量myLabel，这个变量关联（二号关联）到这个Label</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="7" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="8" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>模型(Model)</h1>
<ul>
<li>用于封装与应用程序的业务逻辑相关的数据以及对数据对处理方法。
<ul>
<li>直接访问数据对权力：例如对数据库的访问。</li>
<li>不依赖于View和Controller：不关心自己被如何展示和操作，只提供调用的接口(读写、功能方法)。</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="9" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>模型</h1>
<pre><code class="language-swift"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ChecklistItem</span> :<span class="hljs-title">NSObject</span>, <span class="hljs-title">Codable</span></span>{
<span class="hljs-keyword">var</span> title: <span class="hljs-type">String</span> <span class="hljs-operator">=</span> <span class="hljs-string">""</span> <span class="hljs-comment">// 应用数据</span>
<span class="hljs-keyword">var</span> checked: <span class="hljs-type">Bool</span> <span class="hljs-operator">=</span> <span class="hljs-literal">false</span> <span class="hljs-comment">// 应用数据</span>
<span class="hljs-keyword">var</span> dueDate <span class="hljs-operator">=</span> <span class="hljs-type">Date</span>() <span class="hljs-comment">// 应用数据</span>
<span class="hljs-keyword">var</span> itemID <span class="hljs-operator">=</span> <span class="hljs-operator">-</span><span class="hljs-number">1</span> <span class="hljs-comment">// 应用数据</span>
<span class="hljs-function"><span class="hljs-keyword">init</span>(<span class="hljs-keyword">_</span> <span class="hljs-params">title</span>: <span class="hljs-type">String</span>, <span class="hljs-keyword">_</span> <span class="hljs-params">checked</span>: <span class="hljs-type">Bool</span>)</span> {
<span class="hljs-keyword">self</span>.title <span class="hljs-operator">=</span> title
<span class="hljs-keyword">self</span>.checked <span class="hljs-operator">=</span> checked
<span class="hljs-keyword">self</span>.itemID <span class="hljs-operator">=</span> <span class="hljs-type">Checklist</span>.nextChecklistItemID()
}
<span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">scheduleNotification</span>()</span> { <span class="hljs-comment">// 功能方法</span>
<span class="hljs-keyword">if</span> shouldRemind <span class="hljs-operator">&&</span> dueDate <span class="hljs-operator">></span> <span class="hljs-type">Date</span>() {
<span class="hljs-built_in">print</span>(<span class="hljs-string">"We should schedule a notification"</span>)
}
}
}
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="10" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>UIKit App 代码结构</h1>
<p><img src="./images/2/mvc.png" alt="width:700px" style="width:700px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="11" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>UIApplication</h1>
<ul>
<li>每一个iOS应用都拥有一个<code>UIApplication</code>类(或者其子类)的实例。当应用启动时，系统调用<code>UIApplicationMain(_:_:_:_:)</code>函数，这个函数创建应用对应的<code>UIApplication</code>的单例(Singleton)对象。</li>
<li>作用
<ul>
<li>处理用户事件：将到达的用户事件派发给合适的目标对象处理</li>
<li>维护本应用的<code>UIWindow</code>对象列表：为了能够获取应用的所有<code>UIView</code>对象</li>
</ul>
</li>
</ul>
<p><a href="https://developer.apple.com/documentation/uikit/uiapplication">https://developer.apple.com/documentation/uikit/uiapplication</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="12" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Delegate</h1>
<p>在iOS12及之前的版本，我们使用<code>UIApplicationDelegate</code>的实例和<code>UIApplication</code>的实例一起完成一些工作，包括配置或者启动一些所需要的服务，以及响应应用的生命周期事件(主要)。</p>
<p><a href="https://developer.apple.com/documentation/uikit/uiapplicationdelegate">https://developer.apple.com/documentation/uikit/uiapplicationdelegate</a></p>
<p>iOS 13及之后，由<code>UISceneDelegate</code>完成这些工作。</p>
<p><a href="https://developer.apple.com/documentation/uikit/uiscenedelegate">https://developer.apple.com/documentation/uikit/uiscenedelegate</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="13" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/life_cycle.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="13" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="13" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>生命周期</h1>
<p>Scene Based Life-Cycle Events</p>
<p><a href="https://developer.apple.com/documentation/uikit/app_and_environment/managing_your_app_s_life_cycle">https://developer.apple.com/documentation/uikit/app_and_environment/managing_your_app_s_life_cycle</a></p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="13" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="14" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>生命周期状态</h1>
<ul>
<li>Unattached: 应用尚未启动或者已经被系统终止。</li>
<li>Foreground Inactive: 应用正在运行，但是没有接受到任何事件。(例如应用被电话打断)</li>
<li>Foreground Active: 应用在正常运行。</li>
<li>Background: 应用在后台运行，并且在执行代码。</li>
<li>Suspended: 应用在后台挂起，但是没有执行代码。</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="15" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>UIWindowSceneDelegate</h1>
<p><code>UIWindwoSceneDelegate</code>将负责响应应用的生命周期变化的事件。</p>
<ul>
<li><code>sceneDidDisconnect(_:)</code>: 场景与App断开连接</li>
<li><code>sceneDidBecomeActive(_:)</code>: 用户开始与场景交互</li>
<li><code>sceneWillResignActive(_:)</code>: 停止与场景交互(例如切换到另一个场景)</li>
<li><code>sceneWillEnterForeground(_:)</code>: 场景将进入前台</li>
<li><code>sceneDidEnterBackground(_:)</code>: 场景回到后台后调用</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="16" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Delegate(委托) 模式</h1>
<p>注意到<code>UIApplicationDelegate</code>和<code>UIWindowSceneDelegate</code>都叫做Delegate。其实这是一种设计模式。</p>
<blockquote>
<p>委托模式是软件设计模式中的基本技巧，在委托模式中，两个对象参与处理同一个请求，接受请求的对象委托另一个对象来处理。</p>
</blockquote>
<p><a href="https://en.wikipedia.org/wiki/Delegation_pattern">https://en.wikipedia.org/wiki/Delegation_pattern</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="17" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Swift Protocol</h1>
<ul>
<li>一个protocol(协议)中描述了一些方法。类、结构体、枚举都可以接受(adopt)一个协议，一个实现了协议中所有方法的类型被称为确认(conform)了这个协议。</li>
<li>协议适用于想修改原有类型的方法或者扩展原有类型的方法，而通过继承开销太大，使用协议更加轻量级。</li>
</ul>
<p><a href="https://docs.swift.org/swift-book/LanguageGuide/Protocols.html">https://docs.swift.org/swift-book/LanguageGuide/Protocols.html</a></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="18" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Swift Protocol</h1>
<p>为控制器定制对文本输入的处理方法。</p>
<pre><code class="language-swift"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">extension</span> <span class="hljs-title">AddListViewController</span>: <span class="hljs-title">UITextFieldDelegate</span> </span>{
<span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">textField</span>(<span class="hljs-keyword">_</span> <span class="hljs-params">textField</span>: <span class="hljs-type">UITextField</span>, <span class="hljs-params">shouldChangeCharactersIn</span> <span class="hljs-params">range</span>: <span class="hljs-type">NSRange</span>, <span class="hljs-params">replacementString</span> <span class="hljs-params">string</span>: <span class="hljs-type">String</span>)</span> -> <span class="hljs-type">Bool</span> {
<span class="hljs-keyword">let</span> oldText <span class="hljs-operator">=</span> textField.text<span class="hljs-operator">!</span>
<span class="hljs-keyword">let</span> stringRange <span class="hljs-operator">=</span> <span class="hljs-type">Range</span>(range, in: oldText)<span class="hljs-operator">!</span>
<span class="hljs-keyword">let</span> newText <span class="hljs-operator">=</span> oldText.replacingCharacters(in: stringRange, with: string)
<span class="hljs-keyword">if</span> newText.isEmpty {
doneButton.isEnabled <span class="hljs-operator">=</span> <span class="hljs-literal">false</span>
} <span class="hljs-keyword">else</span> {
doneButton.isEnabled <span class="hljs-operator">=</span> <span class="hljs-literal">true</span>
}
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>
}
<span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">textFieldShouldClear</span>(<span class="hljs-keyword">_</span> <span class="hljs-params">textField</span>: <span class="hljs-type">UITextField</span>)</span> -> <span class="hljs-type">Bool</span> {
doneButton.isEnabled <span class="hljs-operator">=</span> <span class="hljs-literal">false</span>
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>
}
}
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="19" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/app.gif");background-size:90%;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="19" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="19" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="content"></section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="19" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="20" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/overview-hero@2x.png");background-size:50%;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="20" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="20" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;" data-marpit-advanced-background="content">
<h1>SwiftUI & MVVM</h1>
<p>新一代架构</p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="20" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="21" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/projectnav.png");background-size:90%;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="21" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="21" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>其他</h1>
<ul>
<li>App icons (Assets.xcassets)</li>
<li>Launch screen storyboard: 静态启动视图</li>
<li>Main storyboard: 应用视图</li>
<li>App Metadata (Info.plist)</li>
<li>ViewController: 视图控制器</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="21" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="22" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Assets</h1>
<p>Assets提供对不同种类的项目资源(图片、数据、颜色等)的组织管理。</p>
<p><img src="./images/2/assets.png" alt="w:750" style="width:750px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="23" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:70%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/2/resolution.png");background-size:800px auto;"></figure></div></section></foreignObject><foreignObject width="30%" height="720"><section id="23" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="23" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;--marpit-advanced-background-split:70%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>Assets</h1>
<p>在使用 Image Asset时，Xcode要求我们提供1x,2x,3x三种分辨率的图片，这是因为不同的iOS设备的屏幕尺寸和分辨率不同。</p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="23" data-marpit-pagination-total="33"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="24" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>ImageView</h1>
<p>在Assets中新建image assets<br />
<img src="./images/2/create-image-asset.png" alt="w:400" style="width:400px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="25" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>ImageView</h1>
<p>将准备好的不同分辨率的图片分别拖入到对应的框中，然后双击image assets重命名<br />
<img src="./images/2/add-image.png" alt="w:900" style="width:900px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="26" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>ImageView</h1>
<p>在Main.storyboard上添加ImageView<br />
<img src="./images/2/add-image-view.png" alt="w:900" style="width:900px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="27" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>ImageView</h1>
<p>选择image view的image为刚才添加的image assets<br />
<img src="./images/2/select-image.png" alt="w:900" style="width:900px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="28" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>ImageView</h1>
<p>启动模拟器<br />
<img src="./images/2/display-image.png" alt="w:700" style="width:700px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="29" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="29" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>LaunchScreen Storyboard</h1>
<p>Launch screen board是应用在启动期间展示的视图。<br />
<img src="./images/2/launch.gif" alt="w:800" style="width:800px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="30" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="30" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Bundle</h1>
<p>Bundle是Apple组织资源的一种方式，可以将Bundle想象成项目的目录，它是一个将所有项目文件组织在一起的文件夹。当需要访问项目中的资源时，可以通过Bundle class</p>
<pre><code class="language-swift"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">if</span> <span class="hljs-keyword">let</span> fileURL <span class="hljs-operator">=</span> <span class="hljs-type">Bundle</span>.main.url(forResource: <span class="hljs-string">"some-file"</span>, withExtension: <span class="hljs-string">"txt"</span>) {
<span class="hljs-comment">// we found the file in our bundle!</span>
}
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="31" data-paginate="true" data-background-color="#fff" data-theme="gaia" data-marpit-pagination="31" data-marpit-pagination-total="33" style="--paginate:true;--background-color:#fff;--theme:gaia;background-color:#fff;background-image:none;">
<h1>Info.plist</h1>
<p>Info.plist 是一个property list，其内部储存了应用运行所需要的配置信息。包括应用的元信息，以及对于用户隐私的使用声明。<br />
<img src="./images/2/info-plist.png" alt="w:700" style="width:700px;" /></p>
<p><small>Property list是一个key-values的字典文件。以扩展名".plist"结尾，一般使用Property list来储存轻量级的数据。</small></p>
</section>
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<h1>小结</h1>
<ul>
<li>iOS App以MVC为其基本结构</li>
<li>App的生命周期在<code>UIApplicationDelegate</code>或<code>UISceneDelegate</code>中响应</li>
<li>iOS App工程中还包括其他资源</li>
</ul>
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