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<!doctype html>
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<title>Property – Objective-C Runtime in Pictures</title>
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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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<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/intro.html" title="Intro">Intro</a>
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<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/class.html" title="Class">Class</a>
</article>
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<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/ivar.html" title="Ivar">Ivar</a>
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<li class="no-bullet"><a class="internal-link" href="/objc-runtime-in-pictures/property.html" title="Property">Property</a>
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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>
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<p>
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<article>
<h1>Property</h1>
<div>
<h2 id="syntax-topic">Syntax topic</h2>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">@interface</span> <span class="nc">SomeClass</span>
<span class="k">@property</span> <span class="kt">float</span> <span class="n">x</span><span class="p">;</span>
<span class="k">@end</span>
</code></pre></div></div>
<h2 id="property-lists">Property Lists</h2>
<p>A <strong>property</strong> is a combination of <em>methods</em> and an <em>ivar</em>.When you declare a property, an instance variable is (usually) created and several messages.
are auto-generated to support the property:</p>
<div class="language-objc highlighter-rouge"><div class="highlight"><pre class="highlight"><code>
<span class="k">@interface</span> <span class="nc">CGPoint</span>
<span class="k">@property</span> <span class="kt">float</span> <span class="n">x</span><span class="p">;</span>
<span class="k">@property</span> <span class="kt">float</span> <span class="n">y</span><span class="p">;</span>
<span class="k">@end</span>
<span class="k">@implementation</span> <span class="nc">CGPoint</span>
<span class="k">+</span> <span class="p">(</span><span class="n">instancetype</span><span class="p">)</span> <span class="n">new</span>
<span class="p">{</span>
<span class="k">return</span><span class="p">(</span> <span class="n">mulle_objc_infraclass_alloc_instance</span><span class="p">(</span> <span class="n">self</span><span class="p">));</span>
<span class="p">}</span>
<span class="k">@end</span>
</code></pre></div></div>
<p>The above will create entries in the class’s methodlist and ivarlist:</p>
<p><a href="images/properties.svg"><img src="images/properties.svg" alt="Properties" /></a></p>
<h2 id="property">Property</h2>
<p>A <strong>property</strong> ties the instance variable to the methods.
This is the information you can get from a <strong>property</strong>:</p>
<table>
<thead>
<tr>
<th>Field</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">signature</code></td>
<td>type in <a href="https://github.com/mulle-cc/mulle-clang-project/blob/6fa55d0016ce52c8f79167dde22481f473754c60/clang/lib/AST/ASTContext.cpp#L7889">@property attribute</a> format</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">propertyid</code></td>
<td>id (hash) of the property name for lookup. Tip: use <code class="language-plaintext highlighter-rouge">@selector( name)</code></td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">ivarid</code></td>
<td>id (hash) of the ivar name for lookup.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">getter</code></td>
<td>id (hash) of the getter method name for lookup</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">setter</code></td>
<td>id (hash) of the setter method name for lookup</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">bits</code></td>
<td>internal state</td>
</tr>
</tbody>
</table>
<p>The marriage of accessor methods and instance variables allows for simpler and
faster key-value coding, due to introspection and not just convention.</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">MulleObjCClassSearchProperty</code></td>
<td>Find property in a class by propertyid</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">MulleObjCInstanceSearchProperty</code></td>
<td>Find property in an instance’s class by propertyid</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">_MulleObjCInstanceClearProperty</code></td>
<td>Clear a property value (handles retain/copy/assign)</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">_MulleObjCInstanceClearPropertyNoReadOnly</code></td>
<td>Clear non-readonly property value</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">_MulleObjCClassWalkClearableProperties</code></td>
<td>Walk through all clearable properties of a class</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">_MulleObjCInstanceClearProperties</code></td>
<td>Clear all properties of an instance</td>
</tr>
</tbody>
</table>
<h2 id="references">References</h2>
<p><a href="https://mulle-objc.github.io/De-Re-mulle-objc/mydoc_property_new.html"></a></p>
</div>
</article>
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