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dynamic-directive.html
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<!doctype html>
<html class="no-js" lang="en">
<head>
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<meta http-equiv="Content-Security-Policy" content="default-src *; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval'">
<title>@dynamic – De Re @property</title>
<meta name="description" content="In mulle-objc @dynamic can only be usefully used together with the dynamic
attribute. For non-dynamic properties, subclasses will assume the existence of instance variables
which will lead to memory layout issues, when the superclass doesn’t actually have those
instance variables.
">
<meta name="keywords" content="">
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<meta name="twitter:title" content="@dynamic">
<meta name="twitter:description" content="In mulle-objc @dynamic can only be usefully used together with the dynamic attribute. For non-dynamic properties, subclasses will assume the existence of instance variables which will lead to memory layout issues, when the superclass doesn’t actually have those instance variables. But for dynamic properties, if you want to postpone the...">
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<meta property="og:title" content="@dynamic">
<meta property="og:description" content="In mulle-objc @dynamic can only be usefully used together with the dynamic attribute. For non-dynamic properties, subclasses will assume the existence of instance variables which will lead to memory layout issues, when the superclass doesn’t actually have those instance variables. But for dynamic properties, if you want to postpone the...">
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<meta property="og:site_name" content="De Re @property">
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<img src="images/dog-pic.jpg" class="bio-photo" alt="Nat! bio photo">
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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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<h6>© 2025 by Nat!, Mulle kybernetiK. All rights reserved.</h6>
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<h4>Contents</h4>
<ul>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/intro.html" title="Intro">Intro</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/declaration.html" title="@property declaration">@property declaration</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/attributes.html" title="@property( attributes)">@property( attributes)</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/definition.html" title="@property definition">@property definition</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/access.html" title="@property access">@property access</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/runtime.html" title="@property signature">@property signature</a>
</article>
<article>
<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>
</article>
<article>
<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>
</article>
<article>
<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>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/redeclaration.html" title="@property redeclaration">@property redeclaration</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/synthesize-directive.html" title="@synthesize">@synthesize</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/dynamic-directive.html" title="@dynamic">@dynamic</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/outro.html" title="Outro">Outro</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/assign.html" title="Reference: assign">Reference: assign</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/container.html" title="Reference: container">Reference: container</a>
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<li class="no-bullet"><a class="internal-link" href="/de-re-property/copy.html" title="Reference: copy">Reference: copy</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/dynamic.html" title="Reference: dynamic">Reference: dynamic</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/observable.html" title="Reference: observable">Reference: observable</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/nonatomic.html" title="Reference: nonatomic">Reference: nonatomic</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/readonly.html" title="Reference: readonly">Reference: readonly</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/retain.html" title="Reference: retain">Reference: retain</a>
</article>
<article>
<li class="no-bullet"><a class="internal-link" href="/de-re-property/serializable.html" title="Reference: serializable">Reference: serializable</a>
</article>
</ul>
<h5> Or read it like a <a href="book.html"><b>book</b></a>.</h6>
</div> <!-- contents -->
</div> <!-- sideline -->
</div>
<div id="post-second" class="eight columns">
<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>@dynamic</h1>
<div>
<p>In mulle-objc <code class="language-plaintext highlighter-rouge">@dynamic</code> can only be usefully used together with the <a href="dynamic.html"><code class="language-plaintext highlighter-rouge">dynamic</code></a>
attribute. For non-dynamic properties, subclasses will assume the existence of instance variables
which will lead to memory layout issues, when the superclass doesn’t actually have those
instance variables.</p>
<p>But for dynamic properties, if you want to postpone the implementation to a subclass or a
category or you want to <code class="language-plaintext highlighter-rouge">forward:</code>, then <code class="language-plaintext highlighter-rouge">@dynamic</code> will allow you to compile the
<code class="language-plaintext highlighter-rouge">@implementation</code>without any accessor code.</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="k">@property</span><span class="p">(</span><span class="n">dynamic</span><span class="p">)</span> <span class="n">NSString</span> <span class="o">*</span><span class="n">propertyName</span><span class="p">;</span>
<span class="k">@end</span>
<span class="k">@implementation</span> <span class="nc">MyClass</span>
<span class="k">@dynamic</span> <span class="n">propertyName</span><span class="p">;</span>
<span class="k">@end</span>
</code></pre></div></div>
</div>
</article>
</div>
<p>
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Back to <a rel="prev" class="internal-link" href="/de-re-property/synthesize-directive.html">@synthesize</a>
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<span class="link">
Next <a rel="next" class="internal-link" href="/de-re-property/outro.html">Outro</a>
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