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protocol-inheritance.html
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<!doctype html>
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<title>@property inheritance by protocol – De Re @property</title>
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<h4>Nat!</h4>
<p>Senior Mull</p>
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<h2>De Re @property <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/intro.html" title="Intro">Intro</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/declaration.html" title="@property declaration">@property declaration</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/attributes.html" title="@property( attributes)">@property( attributes)</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/definition.html" title="@property definition">@property definition</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/runtime.html" title="@property signature">@property signature</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/class-inheritance.html" title="@property inheritance by class">@property inheritance by class</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/protocol-inheritance.html" title="@property inheritance by protocol">@property inheritance by protocol</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/protocolclass-inheritance.html" title="@property inheritance by protocolclass">@property inheritance by protocolclass</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/assign.html" title="Reference: assign">Reference: assign</a>
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<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
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<div class="title">
<div>
<h2>De Re @property <div style="font-size:10px; display: inline-block;">0.0.1</div> <a href="feed.xml"><img class="inline-img" src='images/feed-icon-28x28.png'></a></h2>
</div>
<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
<p>
</div> <!-- title -->
<p>
<div id="main" role="main">
<article>
<h1>@property inheritance by protocol</h1>
<div>
<p>A protocol only specifies the syntax a class should adhere to. Consequently
the class that adapts a protocol must also implement the properties the
protocol declares:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@protocol</span> <span class="nc">MulleCursor</span>
<span class="k">@property</span><span class="p">(</span> <span class="n">assign</span><span class="p">,</span> <span class="n">getter</span><span class="o">=</span><span class="n">isEditing</span><span class="p">)</span> <span class="n">BOOL</span> <span class="n">editing</span><span class="p">;</span>
<span class="k">@property</span><span class="p">(</span> <span class="n">assign</span><span class="p">)</span> <span class="n">MulleCursorPosition</span> <span class="n">cursorPosition</span><span class="p">;</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>A common trope for a protocol that declares @properties is to create a
<code class="language-plaintext highlighter-rouge">#define ..._PROPERTIES</code> that the adopting class can then use:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define MULLE_CURSOR_PROPERTIES \
@property( assign, getter=isEditing) BOOL editing; \
@property( assign) MulleCursorPosition cursorPosition
</span>
<span class="k">@protocol</span> <span class="nc">MulleCursor</span>
<span class="n">MULLE_CURSOR_PROPERTIES</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">MulleCursorPosition</span><span class="p">)</span> <span class="nf">cursorPositionForPoint</span><span class="p">:(</span><span class="n">CGPoint</span><span class="p">)</span> <span class="n">mouseLocation</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGFloat</span><span class="p">)</span> <span class="n">offsetNeededToMakeCursorVisible</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">MulleCursorPosition</span><span class="p">)</span> <span class="n">maxCursorPosition</span><span class="p">;</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>A class implementing MulleCursor would then be written like this:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@interface</span> <span class="nc">MyClass</span> <span class="p">:</span> <span class="nc">NSObject</span> <span class="o"><</span> <span class="n">MulleCursor</span><span class="o">></span>
<span class="n">MULLE_CURSOR_PROPERTIES</span><span class="p">;</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>with minimal fuzz.</p>
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