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<div class="section-content top-matter">
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<h1 id='class-delegate-protocol' class='heading'>Class Delegate Protocol</h1>
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<p>Delegate protocols should be class-only so they can be weakly referenced</p>
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<ul>
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<li><strong>Identifier:</strong> <code>class_delegate_protocol</code></li>
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<li><strong>Enabled by default:</strong> Yes</li>
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<li><strong>Supports autocorrection:</strong> No</li>
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<li><strong>Kind:</strong> lint</li>
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<li><strong>Analyzer rule:</strong> No</li>
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<li><strong>Minimum Swift compiler version:</strong> 5.0.0</li>
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<li><strong>Default configuration:</strong>
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<table>
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<thead>
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<tr><th>Key</th><th>Value</th></tr>
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</thead>
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<tbody>
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<tr>
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<td>
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severity
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</td>
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<td>
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warning
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</td>
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</tr>
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</tbody>
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</table></li>
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</ul>
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<h2 id='rationale' class='heading'>Rationale</h2>
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<p>Delegate protocols are usually <code>weak</code> to avoid retain cycles, or bad references to deallocated delegates.</p>
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<p>The <code>weak</code> operator is only supported for classes, and so this rule enforces that protocols ending in “Delegate” are class based.</p>
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<p>For example</p>
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<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kd">class</span> <span class="p">{}</span>
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</code></pre>
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<p>versus</p>
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<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="p">{}</span>
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</code></pre>
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<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
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<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kd">class</span> <span class="p">{}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kd">class</span><span class="p">,</span> <span class="kt">BarDelegate</span> <span class="p">{}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">Foo</span> <span class="p">{}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">FooDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">@objc</span> <span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">@objc</span><span class="p">(</span><span class="kt">MyFooDelegate</span><span class="p">)</span>
|
||
<span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">BarDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">AnyObject</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">AnyObject</span> <span class="o">&</span> <span class="kt">Foo</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">Foo</span><span class="p">,</span> <span class="kt">AnyObject</span> <span class="o">&</span> <span class="kt">Foo</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">Foo</span> <span class="o">&</span> <span class="kt">AnyObject</span> <span class="o">&</span> <span class="kt">Bar</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">NSObjectProtocol</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">BarDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">BarDelegate</span> <span class="o">&</span> <span class="kt">Bar</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">Foo</span> <span class="o">&</span> <span class="kt">BarDelegate</span> <span class="o">&</span> <span class="kt">Bar</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">AnyObject</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">NSObjectProtocol</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">Actor</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">Bar</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span><span class="p">:</span> <span class="kt">Foo</span> <span class="o">&</span> <span class="kt">Bar</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">StringProtocol</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kd">protocol</span> <span class="kt">FooDelegate</span> <span class="k">where</span> <span class="k">Self</span><span class="p">:</span> <span class="kt">A</span> <span class="o">&</span> <span class="kt">B</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
</section>
|
||
|
||
|
||
</article>
|
||
</div>
|
||
<section class="footer">
|
||
<p>© 2023 <a class="link" href="https://jpsim.com" target="_blank" rel="external noopener">JP Simard</a> under MIT.</p>
|
||
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external noopener">jazzy ♪♫ v0.15.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external noopener">Realm</a> project.</p>
|
||
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|
||
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