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protocol.html
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<!doctype html>
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<title>Protocol – Objective-C Runtime in Pictures</title>
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<meta name="twitter:title" content="Protocol">
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<h4>Nat!</h4>
<p>Senior Mull</p>
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<h2>Objective-C Runtime in Pictures <a href="/objc-runtime-in-pictures/feed.xml"><img class="inline-img" src="/objc-runtime-in-pictures/images/feed-icon-28x28.png"></a></h2>
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<h6>© 2024 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
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<h4>Contents</h4>
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<article>
<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/intro.html" title="Intro">Intro</a>
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<div class="title">
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<h2>Objective-C Runtime in Pictures <a href="/objc-runtime-in-pictures/feed.xml"><img class="inline-img" src="/objc-runtime-in-pictures/images/feed-icon-28x28.png"></a></h2>
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<h6>© 2024 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<p>
<div id="main" role="main">
<article>
<h1>Protocol</h1>
<div>
<h2 id="syntax-topics">Syntax topics</h2>
<div class="language-objective-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@protocol</span> <span class="nc">SomeProtocol</span>
<span class="k">@end</span>
<span class="k">@interface</span> <span class="nc">SomeClass</span> <span class="o"><</span><span class="n">SomeProtocol</span><span class="o">></span>
<span class="k">@end</span>
<span class="p">[</span><span class="n">objc</span> <span class="nf">conformsToProtocol</span><span class="p">:</span><span class="k">@protocol</span><span class="err">(</span> <span class="nc">SomeProtocol</span><span class="p">)];</span>
</code></pre></div></div>
<h2 id="protocol">@protocol</h2>
<p>A <strong>protocol</strong> is a way to declare a set of methods. A class that
<em>adopts</em> a protocol, declares that it implements all of the methods in the
protocol:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@protocol</span> <span class="nc">EmptyProtocol</span>
<span class="k">@end</span>
<span class="k">@interface</span> <span class="nc">SomeClass</span> <span class="o"><</span><span class="n">EmptyProtocol</span><span class="o">></span>
<span class="k">@end</span>
<span class="k">@implementation</span> <span class="nc">SomeClass</span>
<span class="c1">// protocol EmptyProtocol is empty, so no need to implement anything</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>The actual output of the compiler is just an identifier that can be queried
with <code class="language-plaintext highlighter-rouge">[Someclass conformsToProtocol:@protocol( EmptyProtocol)]</code>.</p>
<p><a href="images/protocol.svg"><img src="images/protocol.svg" alt="Protocol" /></a></p>
<p>At runtime, the information is lost, which methods are part of a protocol..</p>
<hr />
<h2 id="api">API</h2>
<table>
<thead>
<tr>
<th>Function/Method Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">MulleObjCProtocolGetNameUTF8String</code></td>
<td>Get protocol name as UTF8 string</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">-conformsToProtocol:</code></td>
<td>Check if receiver conforms to protocol (including inheritance)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">-mulleContainsProtocol:</code></td>
<td>Check if receiver directly implements protocol (no inheritance)</td>
</tr>
</tbody>
</table>
</div>
</article>
</div>
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