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IGListAdapter.html
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<!DOCTYPE html>
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<title>IGListAdapter Class Reference</title>
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<article class="main-content">
<section>
<section class="section">
<h1>IGListAdapter</h1>
<div class="declaration">
<div class="language">
<pre class="highlight"><code><span class="k">@interface</span> <span class="nc">IGListAdapter</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
</div>
<p><code>IGListAdapter</code> objects provide an abstraction for feeds of objects in a <code>UICollectionView</code> by breaking each object into
individual sections, called <q>section controllers</q>. These controllers (objects conforming to <code><a href="../Protocols/IGListSectionType.html">IGListSectionType</a></code>) act as a
data source and delegate for each section.</p>
<p>Feed implementations must act as the data source for an <code>IGListAdapter</code> in order to drive the objects and section
controllers in a collection view.</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)viewController"></a>
<a name="//apple_ref/objc/Property/viewController" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)viewController">viewController</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The view controller that houses the adapter.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">UIViewController</span> <span class="o">*</span><span class="n">viewController</span><span class="p">;</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)collectionView"></a>
<a name="//apple_ref/objc/Property/collectionView" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)collectionView">collectionView</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The collection view used with the adapter.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n"><a href="../Classes.html#/c:objc(cs)IGListCollectionView">IGListCollectionView</a></span> <span class="o">*</span><span class="n">collectionView</span><span class="p">;</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)dataSource"></a>
<a name="//apple_ref/objc/Property/dataSource" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)dataSource">dataSource</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 that acts as the data source for the list adapter.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</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/IGListAdapterDataSource.html">IGListAdapterDataSource</a></span><span class="o">></span>
<span class="n">dataSource</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">dataSource</span><span class="p">:</span> <span class="kt">AnyObject</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>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)delegate"></a>
<a name="//apple_ref/objc/Property/delegate" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)delegate">delegate</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 that receives top-level events for section controllers.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</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/IGListAdapterDelegate.html">IGListAdapterDelegate</a></span><span class="o">></span> <span class="n">delegate</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">delegate</span><span class="p">:</span> <span class="kt">AnyObject</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>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)collectionViewDelegate"></a>
<a name="//apple_ref/objc/Property/collectionViewDelegate" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)collectionViewDelegate">collectionViewDelegate</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 that receives <code>UICollectionViewDelegate</code> events.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
This object <em>will not</em> receive <code>UIScrollViewDelegate</code> events. Instead use scrollViewDelegate.
</div>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</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">UICollectionViewDelegate</span><span class="o">></span>
<span class="n">collectionViewDelegate</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">collectionViewDelegate</span><span class="p">:</span> <span class="kt">AnyObject</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>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)scrollViewDelegate"></a>
<a name="//apple_ref/objc/Property/scrollViewDelegate" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)scrollViewDelegate">scrollViewDelegate</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 that receives <code>UIScrollViewDelegate</code> events.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</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">UIScrollViewDelegate</span><span class="o">></span>
<span class="n">scrollViewDelegate</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="k">weak</span> <span class="k">var</span> <span class="nv">scrollViewDelegate</span><span class="p">:</span> <span class="kt">AnyObject</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>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)updater"></a>
<a name="//apple_ref/objc/Property/updater" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)updater">updater</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The updater for this list adapter.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">readonly</span><span class="p">,</span> <span class="n">strong</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span>
<span class="n">id</span><span class="o"><</span><span class="n"><a href="../Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></span><span class="o">></span> <span class="n">_Nonnull</span> <span class="n">updater</span><span class="p">;</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(py)experiments"></a>
<a name="//apple_ref/objc/Property/experiments" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(py)experiments">experiments</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A bitmask of experiments to conduct on the adapter.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">@property</span> <span class="p">(</span><span class="n">assign</span><span class="p">,</span> <span class="n">readwrite</span><span class="p">,</span> <span class="n">nonatomic</span><span class="p">)</span> <span class="n"><a href="../Enums/IGListExperiment.html">IGListExperiment</a></span> <span class="n">experiments</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="k">var</span> <span class="nv">experiments</span><span class="p">:</span> <span class="kt">Int32</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)initWithUpdater:viewController:workingRangeSize:"></a>
<a name="//apple_ref/objc/Method/-initWithUpdater:viewController:workingRangeSize:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)initWithUpdater:viewController:workingRangeSize:">-initWithUpdater:viewController:workingRangeSize:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes a new <code>IGListAdapter</code> object.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
<p>The working range is the number of objects beyond the visible objects (plus and minus) that should be
notified when they are close to being visible. For instance, if you have 3 objects on screen and a working range of 2,
the previous and succeeding 2 objects will be notified that they are within the working range. As you scroll the list
the range is updated as objects enter and exit the working range.</p>
</div>
<p>To opt out of using the working range, you can provide a value of <code>0</code>.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">nonnull</span> <span class="n">instancetype</span><span class="p">)</span>
<span class="nf">initWithUpdater</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">id</span><span class="o"><</span><span class="n"><a href="../Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></span><span class="o">></span><span class="p">)</span><span class="nv">updater</span>
<span class="nf">viewController</span><span class="p">:(</span><span class="n">nullable</span> <span class="n">UIViewController</span> <span class="o">*</span><span class="p">)</span><span class="nv">viewController</span>
<span class="nf">workingRangeSize</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">workingRangeSize</span><span class="p">;</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>updater</em>
</code>
</td>
<td>
<div>
<p>An object that manages updates to the collection view.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>viewController</em>
</code>
</td>
<td>
<div>
<p>The view controller that will house the adapter.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>workingRangeSize</em>
</code>
</td>
<td>
<div>
<p>The number of objects before and after the viewport to consider within the working range.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A new list adapter object.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)performUpdatesAnimated:completion:"></a>
<a name="//apple_ref/objc/Method/-performUpdatesAnimated:completion:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)performUpdatesAnimated:completion:">-performUpdatesAnimated:completion:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Perform an update from the previous state of the data source. This is analagous to calling
<code>-[UICollectionView performBatchUpdates:completion:]</code>.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">performUpdatesAnimated</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="n"><a href="../Type Definitions.html#/c:IGListAdapter.h@T@IGListUpdaterCompletion">IGListUpdaterCompletion</a></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"><code><span class="kd">func</span> <span class="nf">performUpdatesAnimated</span><span class="p">(</span><span class="n">_</span> <span class="nv">animated</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</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.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>completion</em>
</code>
</td>
<td>
<div>
<p>The block to execute when the update completes.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)reloadDataWithCompletion:"></a>
<a name="//apple_ref/objc/Method/-reloadDataWithCompletion:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)reloadDataWithCompletion:">-reloadDataWithCompletion:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Perform an immediate reload of the data in the data source, discarding the old objects.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">reloadDataWithCompletion</span><span class="p">:(</span><span class="n">nullable</span> <span class="n"><a href="../Type Definitions.html#/c:IGListAdapter.h@T@IGListUpdaterCompletion">IGListUpdaterCompletion</a></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"><code><span class="kd">func</span> <span class="nf">reloadData</span><span class="p">(</span><span class="n">withCompletion</span> <span class="nv">completion</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>completion</em>
</code>
</td>
<td>
<div>
<p>The block to execute when the reload completes.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)reloadObjects:"></a>
<a name="//apple_ref/objc/Method/-reloadObjects:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)reloadObjects:">-reloadObjects:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Reload the list for only the specified objects.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">reloadObjects</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">NSArray</span> <span class="o">*</span><span class="p">)</span><span class="nv">objects</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">func</span> <span class="nf">reloadObjects</span><span class="p">(</span><span class="n">_</span> <span class="nv">objects</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>objects</em>
</code>
</td>
<td>
<div>
<p>The objects to reload.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)sectionForSectionController:"></a>
<a name="//apple_ref/objc/Method/-sectionForSectionController:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)sectionForSectionController:">-sectionForSectionController:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Query the section index of a list. Constant time lookup.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nf">sectionForSectionController</span><span class="p">:</span>
<span class="p">(</span><span class="n">nonnull</span> <span class="n"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="o"><</span><span class="n"><a href="../Protocols/IGListSectionType.html">IGListSectionType</a></span><span class="o">></span> <span class="o">*</span><span class="p">)</span><span class="nv">sectionController</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">func</span> <span class="nf">section</span><span class="p">(</span><span class="k">for</span> <span class="nv">sectionController</span><span class="p">:</span> <span class="kt"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="o">!</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Any</span><span class="o">!</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>sectionController</em>
</code>
</td>
<td>
<div>
<p>A list object.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The section index of the list if it exists, otherwise <code>NSNotFound</code>.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)sectionControllerForObject:"></a>
<a name="//apple_ref/objc/Method/-sectionControllerForObject:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)sectionControllerForObject:">-sectionControllerForObject:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the section controller for the specified object. Constant time lookup.</p>
<div class="aside aside-see">
<p class="aside-title">See</p>
<p><code>-[IGListAdapterDataSource listAdapter:sectionControllerForObject:]</code></p>
</div>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">__kindof</span> <span class="n"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="o"><</span><span class="n"><a href="../Protocols/IGListSectionType.html">IGListSectionType</a></span><span class="o">></span> <span class="o">*</span><span class="n">_Nullable</span><span class="p">)</span>
<span class="nf">sectionControllerForObject</span><span class="p">:(</span><span class="n">nonnull</span> <span class="n">id</span><span class="p">)</span><span class="nv">object</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">func</span> <span class="nf">sectionController</span><span class="p">(</span><span class="k">for</span> <span class="nv">object</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</span> <span class="o">-></span> <span class="kt"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="p">?</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>object</em>
</code>
</td>
<td>
<div>
<p>An object from the data source.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>An section controller or <code>nil</code> if <code>object</code> is not in the list.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)objectForSectionController:"></a>
<a name="//apple_ref/objc/Method/-objectForSectionController:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)objectForSectionController:">-objectForSectionController:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the object corresponding to the specified section controller in the list. Constant time lookup.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">nullable</span> <span class="n">id</span><span class="p">)</span><span class="nf">objectForSectionController</span><span class="p">:</span>
<span class="p">(</span><span class="n">nonnull</span> <span class="n"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="o"><</span><span class="n"><a href="../Protocols/IGListSectionType.html">IGListSectionType</a></span><span class="o">></span> <span class="o">*</span><span class="p">)</span><span class="nv">sectionController</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">func</span> <span class="nf">object</span><span class="p">(</span><span class="k">for</span> <span class="nv">sectionController</span><span class="p">:</span> <span class="kt"><a href="../Classes/IGListSectionController.html">IGListSectionController</a></span><span class="o">!</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Any</span><span class="p">?</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>sectionController</em>
</code>
</td>
<td>
<div>
<p>A section controller in the list.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The object for the specified section controller, or nil if not found.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)objectAtSection:"></a>
<a name="//apple_ref/objc/Method/-objectAtSection:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)objectAtSection:">-objectAtSection:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the object corresponding to a section in the list. Constant time lookup.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Objective-C</p>
<pre class="highlight"><code><span class="k">-</span> <span class="p">(</span><span class="n">nullable</span> <span class="n">id</span><span class="p">)</span><span class="nf">objectAtSection</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="kd">func</span> <span class="nf">object</span><span class="p">(</span><span class="n">atSection</span> <span class="nv">section</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Any</span><span class="p">?</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>section</em>
</code>
</td>
<td>
<div>
<p>A section in the list.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The object for the specified section, or <code>nil</code> if the section does not exist.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter(im)sectionForObject:"></a>
<a name="//apple_ref/objc/Method/-sectionForObject:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter(im)sectionForObject:">-sectionForObject:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the section corresponding to the specified object in the list. Constant time lookup.</p>