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894c34db05
Summary: ## Changes in this pull request Updates the IGListKit docs to the latest API spec in v5.2.0 ### Checklist - [x] All tests pass. Demo project builds and runs. - [x] I added tests, an experiment, or detailed why my change isn't tested. - [x] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes. - [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/main/.github/CONTRIBUTING.md) Pull Request resolved: https://github.com/instagram/IGListKit/pull/1656 Reviewed By: jurmarcus Differential Revision: D93350284 Pulled By: TimOliver fbshipit-source-id: fa4276caae7309f3ef0fd78f5a0c4bcc05d9cb9f
633 lines
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633 lines
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IGListBindingSectionController Class Reference
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<section>
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<section class="section">
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<h1>IGListBindingSectionController</h1>
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<div class="declaration">
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<div class="language">
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<p class="aside-title">Objective-C</p>
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<pre class="highlight objective_c"><code>
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<span class="k">@interface</span> <span class="nc">IGListBindingSectionController</span><span class="o"><</span>
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<span class="n">__covariant</span> <span class="n">ObjectType</span> <span class="o">:</span> <span class="n">id</span> <span class="o"><</span><span class="n"><a href="../Protocols/IGListDiffable.html">IGListDiffable</a></span><span class="o">>></span> <span class="o">:</span> <span class="n"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span></code></pre>
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</div>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="kd">@MainActor</span> <span class="kd">class</span> <span class="kt">ListBindingSectionController</span><span class="o"><</span><span class="kt">ObjectType</span><span class="o">></span> <span class="p">:</span> <span class="kt">ListSectionController</span> <span class="k">where</span> <span class="kt">ObjectType</span> <span class="p">:</span> <span class="kt">ListDiffable</span></code></pre>
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</div>
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</div>
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<p>This section controller uses a data source to transform its “top level” object into an array of diffable view models.
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It then automatically binds each view model to cells via the <code><a href="../Protocols/IGListBindable.html">IGListBindable</a></code> protocol.</p>
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<p>Models used with <code>IGListBindingSectionController</code> should take special care to always return <code>YES</code> for identical
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objects. That is, any objects with matching <code>-diffIdentifier</code>s should always be equal, that way the section controller
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can create new view models via the data source, create a diff, and update the specific cells that have changed.</p>
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<p>In Objective-C, your <code>-isEqualToDiffableObject:</code> can simply be:</p>
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<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">BOOL</span><span class="p">)</span><span class="nf">isEqualToDiffableObject</span><span class="p">:(</span><span class="n">id</span><span class="p">)</span><span class="nv">object</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nb">YES</span><span class="p">;</span>
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<span class="p">}</span>
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</code></pre>
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<p>In Swift:</p>
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<pre class="highlight objective_c"><code><span class="n">func</span> <span class="n">isEqual</span><span class="p">(</span><span class="n">toDiffableObject</span> <span class="n">object</span><span class="o">:</span> <span class="n">IGListDiffable</span><span class="p">?)</span> <span class="o">-></span> <span class="n">Bool</span> <span class="err">{</span>
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<span class="k">return</span> <span class="nb">true</span>
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<span class="err">}</span>
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</code></pre>
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<p>Only when <code>-diffIdentifier</code>s match is object equality compared, so you can assume the class is the same, and the
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instance has already been checked.</p>
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</section>
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<ul>
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<div>
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<code>
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<a name="/c:objc(cs)IGListBindingSectionController(py)dataSource"></a>
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<a name="//apple_ref/objc/Property/dataSource" class="dashAnchor"></a>
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<a class="token" href="#/c:objc(cs)IGListBindingSectionController(py)dataSource">dataSource</a>
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</code>
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</div>
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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<p>A data source that transforms a top-level object into view models, and returns cells and sizes for given view models.</p>
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</div>
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<div class="declaration">
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<h4>Declaration</h4>
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<div class="language">
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<p class="aside-title">Objective-C</p>
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<pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">nonatomic</span><span class="p">,</span> <span class="n">weak</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">id</span><span class="o"><</span><span class="n"><a href="../Protocols/IGListBindingSectionControllerDataSource.html">IGListBindingSectionControllerDataSource</a></span><span class="o">></span> <span class="n">dataSource</span><span class="p">;</span></code></pre>
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</div>
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<div class="language">
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<p class="aside-title">Swift</p>
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<pre class="highlight swift"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">dataSource</span><span class="p">:</span> <span class="p">(</span><span class="n">any</span> <span class="kt">ListBindingSectionControllerDataSource</span><span class="p">)?</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
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</div>
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</div>
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</section>
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</div>
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</li>
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<li class="item">
|
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<div>
|
|
<code>
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|
<a name="/c:objc(cs)IGListBindingSectionController(py)selectionDelegate"></a>
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|
<a name="//apple_ref/objc/Property/selectionDelegate" class="dashAnchor"></a>
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|
<a class="token" href="#/c:objc(cs)IGListBindingSectionController(py)selectionDelegate">selectionDelegate</a>
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</code>
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</div>
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<div class="height-container">
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<div class="pointer-container"></div>
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<section class="section">
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<div class="pointer"></div>
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<div class="abstract">
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|
<p>A delegate that receives selection events from cells in an <code>IGListBindingSectionController</code> instance.</p>
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|
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</div>
|
|
<div class="declaration">
|
|
<h4>Declaration</h4>
|
|
<div class="language">
|
|
<p class="aside-title">Objective-C</p>
|
|
<pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">nonatomic</span><span class="p">,</span> <span class="n">weak</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">id</span><span class="o"><</span><span class="n"><a href="../Protocols/IGListBindingSectionControllerSelectionDelegate.html">IGListBindingSectionControllerSelectionDelegate</a></span><span class="o">></span> <span class="n">selectionDelegate</span><span class="p">;</span></code></pre>
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|
|
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</div>
|
|
<div class="language">
|
|
<p class="aside-title">Swift</p>
|
|
<pre class="highlight swift"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">selectionDelegate</span><span class="p">:</span> <span class="p">(</span><span class="n">any</span> <span class="kt">ListBindingSectionControllerSelectionDelegate</span><span class="p">)?</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
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|
|
|
</div>
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|
</div>
|
|
</section>
|
|
</div>
|
|
</li>
|
|
<li class="item">
|
|
<div>
|
|
<code>
|
|
<a name="/c:objc(cs)IGListBindingSectionController(py)object"></a>
|
|
<a name="//apple_ref/objc/Property/object" class="dashAnchor"></a>
|
|
<a class="token" href="#/c:objc(cs)IGListBindingSectionController(py)object">object</a>
|
|
</code>
|
|
</div>
|
|
<div class="height-container">
|
|
<div class="pointer-container"></div>
|
|
<section class="section">
|
|
<div class="pointer"></div>
|
|
<div class="abstract">
|
|
<p>The object currently assigned to the section controller, if any.</p>
|
|
|
|
</div>
|
|
<div class="declaration">
|
|
<h4>Declaration</h4>
|
|
<div class="language">
|
|
<p class="aside-title">Objective-C</p>
|
|
<pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">nonatomic</span><span class="p">,</span> <span class="n">strong</span><span class="p">,</span> <span class="n">readonly</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">ObjectType</span> <span class="n">object</span><span class="p">;</span></code></pre>
|
|
|
|
</div>
|
|
<div class="language">
|
|
<p class="aside-title">Swift</p>
|
|
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">object</span><span class="p">:</span> <span class="kt">ObjectType</span><span class="p">?</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
|
|
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</div>
|
|
</li>
|
|
<li class="item">
|
|
<div>
|
|
<code>
|
|
<a name="/c:objc(cs)IGListBindingSectionController(py)viewModels"></a>
|
|
<a name="//apple_ref/objc/Property/viewModels" class="dashAnchor"></a>
|
|
<a class="token" href="#/c:objc(cs)IGListBindingSectionController(py)viewModels">viewModels</a>
|
|
</code>
|
|
</div>
|
|
<div class="height-container">
|
|
<div class="pointer-container"></div>
|
|
<section class="section">
|
|
<div class="pointer"></div>
|
|
<div class="abstract">
|
|
<p>The array of view models created from the data source. Values are changed when the top-level object changes or by
|
|
calling <code><a href="../Classes/IGListBindingSectionController.html#/c:objc(cs)IGListBindingSectionController(im)updateAnimated:completion:">-updateAnimated:completion:</a></code> manually.</p>
|
|
|
|
</div>
|
|
<div class="declaration">
|
|
<h4>Declaration</h4>
|
|
<div class="language">
|
|
<p class="aside-title">Objective-C</p>
|
|
<pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">nonatomic</span><span class="p">,</span> <span class="n">copy</span><span class="p">,</span> <span class="n">readonly</span><span class="p">)</span> <span class="n">NSArray</span><span class="o"><</span><span class="n">id</span><span class="o"><</span><span class="n"><a href="../Protocols/IGListDiffable.html">IGListDiffable</a></span><span class="o">>></span> <span class="o">*</span><span class="n">_Nonnull</span> <span class="n">viewModels</span><span class="p">;</span></code></pre>
|
|
|
|
</div>
|
|
<div class="language">
|
|
<p class="aside-title">Swift</p>
|
|
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">viewModels</span><span class="p">:</span> <span class="p">[</span><span class="n">any</span> <span class="kt">ListDiffable</span><span class="p">]</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
|
|
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</div>
|
|
</li>
|
|
<li class="item">
|
|
<div>
|
|
<code>
|
|
<a name="/c:objc(cs)IGListBindingSectionController(im)updateAnimated:completion:"></a>
|
|
<a name="//apple_ref/objc/Method/-updateAnimated:completion:" class="dashAnchor"></a>
|
|
<a class="token" href="#/c:objc(cs)IGListBindingSectionController(im)updateAnimated:completion:">-updateAnimated:<wbr>completion:<wbr></a>
|
|
</code>
|
|
</div>
|
|
<div class="height-container">
|
|
<div class="pointer-container"></div>
|
|
<section class="section">
|
|
<div class="pointer"></div>
|
|
<div class="abstract">
|
|
<p>Tells the section controller to query for new view models, diff the changes, and update its cells.</p>
|
|
|
|
</div>
|
|
<div class="declaration">
|
|
<h4>Declaration</h4>
|
|
<div class="language">
|
|
<p class="aside-title">Objective-C</p>
|
|
<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">updateAnimated</span><span class="p">:(</span><span class="n">BOOL</span><span class="p">)</span><span class="nv">animated</span>
|
|
<span class="nf">completion</span><span class="p">:(</span><span class="n">nullable</span> <span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="p">)(</span><span class="n">BOOL</span><span class="p">))</span><span class="nv">completion</span><span class="p">;</span></code></pre>
|
|
|
|
</div>
|
|
<div class="language">
|
|
<p class="aside-title">Swift</p>
|
|
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">update</span><span class="p">(</span><span class="nv">animated</span><span class="p">:</span> <span class="kt">Bool</span><span class="p">)</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Bool</span></code></pre>
|
|
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<h4>Parameters</h4>
|
|
<table class="graybox">
|
|
<tbody>
|
|
<tr>
|
|
<td>
|
|
<code>
|
|
<em>animated</em>
|
|
</code>
|
|
</td>
|
|
<td>
|
|
<div>
|
|
<p>A flag indicating if the transition should be animated or not.</p>
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<code>
|
|
<em>completion</em>
|
|
</code>
|
|
</td>
|
|
<td>
|
|
<div>
|
|
<p>An optional completion block executed after updates finish. Parameter is YES if updates were applied.</p>
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</section>
|
|
</div>
|
|
</li>
|
|
<li class="item">
|
|
<div>
|
|
<code>
|
|
<a name="/c:objc(cs)IGListBindingSectionController(im)moveObjectFromIndex:toIndex:"></a>
|
|
<a name="//apple_ref/objc/Method/-moveObjectFromIndex:toIndex:" class="dashAnchor"></a>
|
|
<a class="token" href="#/c:objc(cs)IGListBindingSectionController(im)moveObjectFromIndex:toIndex:">-moveObjectFromIndex:<wbr>toIndex:<wbr></a>
|
|
</code>
|
|
</div>
|
|
<div class="height-container">
|
|
<div class="pointer-container"></div>
|
|
<section class="section">
|
|
<div class="pointer"></div>
|
|
<div class="abstract">
|
|
<p>Notifies the section that a list object should move within a section as the result of interactive reordering.</p>
|
|
<div class="aside aside-note">
|
|
<p class="aside-title">Note</p>
|
|
<p>this method must be implemented if interactive reordering is enabled. To ensure updating the internal viewModels array, <strong>calling super is required</strong>, preferably before your own implementation.</p>
|
|
|
|
</div>
|
|
|
|
</div>
|
|
<div class="declaration">
|
|
<h4>Declaration</h4>
|
|
<div class="language">
|
|
<p class="aside-title">Objective-C</p>
|
|
<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">moveObjectFromIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">sourceIndex</span>
|
|
<span class="nf">toIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">destinationIndex</span><span class="p">;</span></code></pre>
|
|
|
|
</div>
|
|
<div class="language">
|
|
<p class="aside-title">Swift</p>
|
|
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">moveObject</span><span class="p">(</span><span class="n">from</span> <span class="nv">sourceIndex</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="n">to</span> <span class="nv">destinationIndex</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span></code></pre>
|
|
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<h4>Parameters</h4>
|
|
<table class="graybox">
|
|
<tbody>
|
|
<tr>
|
|
<td>
|
|
<code>
|
|
<em>sourceIndex</em>
|
|
</code>
|
|
</td>
|
|
<td>
|
|
<div>
|
|
<p>The starting index of the object.</p>
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<code>
|
|
<em>destinationIndex</em>
|
|
</code>
|
|
</td>
|
|
<td>
|
|
<div>
|
|
<p>The ending index of the object.</p>
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</section>
|
|
</div>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</section>
|
|
</section>
|
|
<section id="footer">
|
|
<p>© 2026 <a class="link" href="https://twitter.com/MetaOpenSource" target="_blank" rel="external noopener">Instagram</a>. All rights reserved. (Last updated: 2026-02-15)</p>
|
|
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external noopener">jazzy ♪♫ v0.15.4</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external noopener">Realm</a> project.</p>
|
|
</section>
|
|
</article>
|
|
</div>
|
|
</body>
|
|
</html>
|