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Classes.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Classes Reference</title>
<link rel="stylesheet" type="text/css" href="css/jazzy.css" />
<link rel="stylesheet" type="text/css" href="css/highlight.css" />
<meta charset='utf-8'>
<script src="js/jquery.min.js" defer></script>
<script src="js/jazzy.js" defer></script>
</head>
<body>
<a name="//apple_ref/objc/Section/Classes" class="dashAnchor"></a>
<a title="Classes Reference"></a>
<header>
<div class="content-wrapper">
<p><a href="index.html">IGListKit Docs</a> (98% documented)</p>
<p class="header-right"><a href="https://github.com/Instagram/IGListKit"><img src="img/gh.png"/>View on GitHub</a></p>
</div>
</header>
<div class="content-wrapper">
<p id="breadcrumbs">
<a href="index.html">IGListKit Reference</a>
<img id="carat" src="img/carat.png" />
Classes Reference
</p>
</div>
<div class="content-wrapper">
<nav class="sidebar">
<ul class="nav-groups">
<li class="nav-group-name">
<a href="Guides.html">Guides</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="best-practices-and-faq.html">Best Practices and FAQ</a>
</li>
<li class="nav-group-task">
<a href="generating-your-models-using-remodel.html">Generating your models using remodel</a>
</li>
<li class="nav-group-task">
<a href="getting-started.html">Getting Started</a>
</li>
<li class="nav-group-task">
<a href="iglistdiffable-and-equality.html">IGListDiffable and Equality</a>
</li>
<li class="nav-group-task">
<a href="installation.html">Installation</a>
</li>
<li class="nav-group-task">
<a href="migration.html">Migration</a>
</li>
<li class="nav-group-task">
<a href="modeling-and-binding.html">Modeling and Binding</a>
</li>
<li class="nav-group-task">
<a href="vision.html">VISION</a>
</li>
<li class="nav-group-task">
<a href="working-with-core-data.html">Working with Core Data</a>
</li>
<li class="nav-group-task">
<a href="working-with-uicollectionview.html">Working with UICollectionView</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Classes.html">Classes</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Classes/IGListAdapter.html">IGListAdapter</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListAdapterUpdater.html">IGListAdapterUpdater</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListBatchUpdateData.html">IGListBatchUpdateData</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListBindingSectionController.html">IGListBindingSectionController</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListCollectionView.html">IGListCollectionView</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListCollectionViewLayout.html">IGListCollectionViewLayout</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListGenericSectionController.html">IGListGenericSectionController</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListIndexPathResult.html">IGListIndexPathResult</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListIndexSetResult.html">IGListIndexSetResult</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListMoveIndex.html">IGListMoveIndex</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListMoveIndexPath.html">IGListMoveIndexPath</a>
</li>
<li class="nav-group-task">
<a href="Classes.html#/c:objc(cs)IGListReloadDataUpdater">IGListReloadDataUpdater</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListSectionController.html">IGListSectionController</a>
</li>
<li class="nav-group-task">
<a href="Classes/IGListSingleSectionController.html">IGListSingleSectionController</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Constants.html">Constants</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Constants.html#/c:@IGListKitVersionNumber">IGListKitVersionNumber</a>
</li>
<li class="nav-group-task">
<a href="Constants.html#/c:@IGListKitVersionString">IGListKitVersionString</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Enums.html">Enumerations</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Enums/IGListAdapterUpdateType.html">IGListAdapterUpdateType</a>
</li>
<li class="nav-group-task">
<a href="Enums/IGListDiffOption.html">IGListDiffOption</a>
</li>
<li class="nav-group-task">
<a href="Enums/IGListExperiment.html">IGListExperiment</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Protocols.html">Protocols</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Protocols/IGListAdapterDataSource.html">IGListAdapterDataSource</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListAdapterDelegate.html">IGListAdapterDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListAdapterMoveDelegate.html">IGListAdapterMoveDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListAdapterPerformanceDelegate.html">IGListAdapterPerformanceDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListAdapterUpdateListener.html">IGListAdapterUpdateListener</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListAdapterUpdaterDelegate.html">IGListAdapterUpdaterDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListBatchContext.html">IGListBatchContext</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListBindable.html">IGListBindable</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListBindingSectionControllerDataSource.html">IGListBindingSectionControllerDataSource</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListBindingSectionControllerSelectionDelegate.html">IGListBindingSectionControllerSelectionDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListCollectionContext.html">IGListCollectionContext</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListCollectionViewDelegateLayout.html">IGListCollectionViewDelegateLayout</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListCollectionViewLayoutCompatible.html">IGListCollectionViewLayoutCompatible</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListDiffable.html">IGListDiffable</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListDisplayDelegate.html">IGListDisplayDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListScrollDelegate.html">IGListScrollDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListSingleSectionControllerDelegate.html">IGListSingleSectionControllerDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListSupplementaryViewSource.html">IGListSupplementaryViewSource</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListTransitionDelegate.html">IGListTransitionDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a>
</li>
<li class="nav-group-task">
<a href="Protocols/IGListWorkingRangeDelegate.html">IGListWorkingRangeDelegate</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Type%20Definitions.html">Type Definitions</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Type%20Definitions/IGListCollectionScrollingTraits.html">IGListCollectionScrollingTraits</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListCollectionViewBlock">IGListCollectionViewBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListItemUpdateBlock">IGListItemUpdateBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListObjectTransitionBlock">IGListObjectTransitionBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListReloadUpdateBlock">IGListReloadUpdateBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListSingleSectionController.h@T@IGListSingleSectionCellConfigureBlock">IGListSingleSectionCellConfigureBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListSingleSectionController.h@T@IGListSingleSectionCellSizeBlock">IGListSingleSectionCellSizeBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListToObjectBlock">IGListToObjectBlock</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListAdapter.h@T@IGListUpdaterCompletion">IGListUpdaterCompletion</a>
</li>
<li class="nav-group-task">
<a href="Type%20Definitions.html#/c:IGListUpdatingDelegate.h@T@IGListUpdatingCompletion">IGListUpdatingCompletion</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Functions.html">Functions</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Functions.html#/c:@F@IGListDiff">IGListDiff</a>
</li>
<li class="nav-group-task">
<a href="Functions.html#/c:@F@IGListDiffExperiment">IGListDiffExperiment</a>
</li>
<li class="nav-group-task">
<a href="Functions.html#/c:@F@IGListDiffPaths">IGListDiffPaths</a>
</li>
<li class="nav-group-task">
<a href="Functions.html#/c:@F@IGListDiffPathsExperiment">IGListDiffPathsExperiment</a>
</li>
<li class="nav-group-task">
<a href="Functions.html#/c:IGListExperiments.h@F@IGListExperimentEnabled">IGListExperimentEnabled</a>
</li>
</ul>
</li>
<li class="nav-group-name">
<a href="Structs.html">Structures</a>
<ul class="nav-group-tasks">
<li class="nav-group-task">
<a href="Structs/IGListCollectionScrollingTraits.html">IGListCollectionScrollingTraits</a>
</li>
</ul>
</li>
</ul>
</nav>
<article class="main-content">
<section>
<section class="section">
<h1>Classes</h1>
<p>The following classes are available globally.</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListBatchUpdateData"></a>
<a name="//apple_ref/objc/Class/IGListBatchUpdateData" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListBatchUpdateData">IGListBatchUpdateData</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An instance of <code>IGListBatchUpdateData</code> takes section indexes and item index paths
and performs cleanup on init in order to perform a crash-free
update via <code>-[UICollectionView performBatchUpdates:completion:]</code>.</p>
<a href="Classes/IGListBatchUpdateData.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListBatchUpdateData</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListBatchUpdateData</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListIndexPathResult"></a>
<a name="//apple_ref/objc/Class/IGListIndexPathResult" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListIndexPathResult">IGListIndexPathResult</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A result object returned when diffing with sections.</p>
<a href="Classes/IGListIndexPathResult.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListIndexPathResult</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListIndexPathResult</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListIndexSetResult"></a>
<a name="//apple_ref/objc/Class/IGListIndexSetResult" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListIndexSetResult">IGListIndexSetResult</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A result object returned when diffing with indexes.</p>
<a href="Classes/IGListIndexSetResult.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListIndexSetResult</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListIndexSetResult</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListMoveIndex"></a>
<a name="//apple_ref/objc/Class/IGListMoveIndex" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListMoveIndex">IGListMoveIndex</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An object representing a move between indexes.</p>
<a href="Classes/IGListMoveIndex.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListMoveIndex</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListMoveIndex</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListMoveIndexPath"></a>
<a name="//apple_ref/objc/Class/IGListMoveIndexPath" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListMoveIndexPath">IGListMoveIndexPath</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An object representing a move between indexes.</p>
<a href="Classes/IGListMoveIndexPath.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListMoveIndexPath</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListMoveIndexPath</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapter"></a>
<a name="//apple_ref/objc/Class/IGListAdapter" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapter">IGListAdapter</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<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 subclassing to
<code><a href="Classes/IGListSectionController.html">IGListSectionController</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>
<a href="Classes/IGListAdapter.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListAdapter</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListAdapter</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListAdapterUpdater"></a>
<a name="//apple_ref/objc/Class/IGListAdapterUpdater" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListAdapterUpdater">IGListAdapterUpdater</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An <code>IGListAdapterUpdater</code> is a concrete type that conforms to <code><a href="Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></code>.
It is an out-of-box updater for <code><a href="Classes/IGListAdapter.html">IGListAdapter</a></code> objects to use.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
This updater performs re-entrant, coalesced updating for a list. It also uses a least-minimal diff
for calculating UI updates when <code><a href="Classes/IGListAdapter.html">IGListAdapter</a></code> calls
<code>-performUpdateWithCollectionView:fromObjects:toObjects:completion:</code>.
</div>
<a href="Classes/IGListAdapterUpdater.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListAdapterUpdater</span> <span class="p">:</span> <span class="nc">NSObject</span> <span class="o"><</span><span class="n"><a href="Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></span><span class="o">></span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListAdapterUpdater</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">ListUpdatingDelegate</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListBindingSectionController"></a>
<a name="//apple_ref/objc/Class/IGListBindingSectionController" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListBindingSectionController">IGListBindingSectionController</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This section controller uses a data source to transform its <q>top level</q> object into an array of diffable view models.
It then automatically binds each view model to cells via the <code><a href="Protocols/IGListBindable.html">IGListBindable</a></code> protocol.</p>
<p>Models used with <code>IGListBindingSectionController</code> should take special care to always return <code>YES</code> for identical
objects. That is, any objects with matching <code>-diffIdentifier</code>s should always be equal, that way the section controller
can create new view models via the data source, create a diff, and update the specific cells that have changed.</p>
<p>In Objective-C, your <code>-isEqualToDiffableObject:</code> can simply be:</p>
<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>
<span class="k">return</span> <span class="nb">YES</span><span class="p">;</span>
<span class="p">}</span>
</code></pre>
<p>In Swift:</p>
<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>
<span class="k">return</span> <span class="nb">true</span>
<span class="err">}</span>
</code></pre>
<p>Only when <code>-diffIdentifier</code>s match is object equality compared, so you can assume the class is the same, and the
instance has already been checked.</p>
<a href="Classes/IGListBindingSectionController.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListBindingSectionController</span><span class="o"><</span>
<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>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><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>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListCollectionView"></a>
<a name="//apple_ref/objc/Class/IGListCollectionView" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListCollectionView">IGListCollectionView</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This <code>UICollectionView</code> subclass allows for partial layout invalidation using <code><a href="Classes/IGListCollectionViewLayout.html">IGListCollectionViewLayout</a></code>,
or custom layout classes that conform to IGListCollectionViewLayoutCompatible.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
When updating a collection view (ex: calling <code>-insertSections</code>), <code>-invalidateLayoutWithContext</code> gets called on
the layout object. However, the invalidation context doesn’t provide details on which index paths are being modified,
which typically forces a full layout re-calculation. <code>IGListCollectionView</code> gives <code><a href="Classes/IGListCollectionViewLayout.html">IGListCollectionViewLayout</a></code> the
missing information to re-calculate only the modified layout attributes.
</div>
<a href="Classes/IGListCollectionView.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListCollectionView</span> <span class="p">:</span> <span class="nc">UICollectionView</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListCollectionView</span> <span class="p">:</span> <span class="kt">UICollectionView</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListCollectionViewLayout"></a>
<a name="//apple_ref/objc/Class/IGListCollectionViewLayout" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListCollectionViewLayout">IGListCollectionViewLayout</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This UICollectionViewLayout subclass is for vertically or horizontally scrolling lists of data with variable widths and
heights. It supports an infinite number of sections and items. All work is done on the main thread, and while extremely efficient,
care must be taken not to stall the main thread in sizing delegate methods.</p>
<p>This layout piggybacks on the mechanics of UICollectionViewFlowLayout in that:</p>
<ul>
<li>Your UICollectionView data source must also conform to UICollectionViewDelegateFlowLayout</li>
<li>Header support given via UICollectionElementKindSectionHeader</li>
</ul>
<p>All UICollectionViewDelegateFlowLayout methods are required and used by this layout:</p>
<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">CGSize</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">sizeForItemAtIndexPath</span><span class="p">:(</span><span class="n">NSIndexPath</span> <span class="o">*</span><span class="p">)</span><span class="nv">indexPath</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">UIEdgeInsets</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">insetForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">minimumLineSpacingForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">minimumInteritemSpacingForSectionAtIndex</span><span class="p">:(</span><span class="n">NSInteger</span><span class="p">)</span><span class="nv">section</span><span class="p">;</span>
<span class="k">-</span> <span class="p">(</span><span class="n">CGSize</span><span class="p">)</span><span class="nf">collectionView</span><span class="p">:(</span><span class="n">UICollectionView</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionView</span> <span class="nf">layout</span><span class="p">:(</span><span class="n">UICollectionViewLayout</span> <span class="o">*</span><span class="p">)</span><span class="nv">collectionViewLayout</span> <span class="nf">referenceSizeForHeaderInSection</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>
<p>In a vertically scrolling layout, sections and items are put into the same horizontal row until the max-x position
of an item extends beyond the width of the collection view. When that happens, the item is <q>newlined</q> to the next row.
The y position of that row is determined by the maximum height (including section insets) of the section/item of the previous row.</p>
<p>Ex. of a section (2,0) with a large width causing a newline.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span> <span class="o">|</span>
<span class="o">|</span><span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span><span class="o">|</span>
</code></pre>
<p>A section with a non-zero height header will always cause that section to newline. Headers are always stretched to the
width of the collection view, pinched with the section insets.</p>
<p>Ex. of a section (2,0) with a header inset on the left/right.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span> <span class="o">|</span>
<span class="o">|</span> <span class="o">>======</span><span class="n">header</span><span class="o">=======<</span> <span class="o">|</span>
<span class="o">|</span> <span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span> <span class="o">|</span>
</code></pre>
<p>Section insets apply to items in the section no matter if they begin on a new row or are on the same row as a previous
section.</p>
<p>Ex. of a section (2) with multiple items and a left inset.</p>
<pre class="highlight objective_c"><code><span class="o">|</span><span class="p">[</span> <span class="mi">0</span><span class="p">,</span><span class="mi">0</span> <span class="p">][</span> <span class="mi">1</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span> <span class="o">></span><span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span> <span class="p">]</span><span class="o">|</span>
<span class="o">|</span> <span class="o">></span><span class="p">[</span> <span class="mi">2</span><span class="p">,</span><span class="mi">1</span> <span class="p">][</span> <span class="mi">2</span><span class="p">,</span><span class="mi">2</span> <span class="p">][</span> <span class="mi">2</span><span class="p">,</span><span class="mi">3</span> <span class="p">]</span><span class="o">|</span>
</code></pre>
<p>Interitem spacing applies to items and sections within the same row. Line spacing only applies to items within the same
section.</p>
<p>In a horizontally scrolling layout, sections and items are flowed vertically until they need to be <q>newlined</q> to the
next column. Headers, if used, are stretched to the height of the collection view, minus the section insets.</p>
<p>Please see the unit tests for more configuration examples and expected output.</p>
<a href="Classes/IGListCollectionViewLayout.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListCollectionViewLayout</span>
<span class="p">:</span> <span class="nc">UICollectionViewLayout</span> <span class="o"><</span><span class="n"><a href="Protocols/IGListCollectionViewLayoutCompatible.html">IGListCollectionViewLayoutCompatible</a></span><span class="o">></span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListCollectionViewLayout</span> <span class="p">:</span> <span class="kt">UICollectionViewLayout</span><span class="p">,</span> <span class="kt">ListCollectionViewLayoutCompatible</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListGenericSectionController"></a>
<a name="//apple_ref/objc/Class/IGListGenericSectionController" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListGenericSectionController">IGListGenericSectionController</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This class adds a helper layer to <code>IGListSectionController</code> to automatically store a generic object in
<code>didUpdateToObject:</code>.</p>
<a href="Classes/IGListGenericSectionController.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListGenericSectionController</span><span class="o"><</span><span class="n">__covariant</span> <span class="n">ObjectType</span><span class="o">></span>
<span class="o">:</span> <span class="n"><a href="Classes/IGListSectionController.html">IGListSectionController</a></span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListGenericSectionController</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">AnyObject</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListReloadDataUpdater"></a>
<a name="//apple_ref/objc/Class/IGListReloadDataUpdater" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListReloadDataUpdater">IGListReloadDataUpdater</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An <code>IGListReloadDataUpdater</code> is a concrete type that conforms to <code><a href="Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></code>.
It is an out-of-box updater for <code><a href="Classes/IGListAdapter.html">IGListAdapter</a></code> objects to use.</p>
<div class="aside aside-note">
<p class="aside-title">Note</p>
This updater performs simple, synchronous updates using <code>-[UICollectionView reloadData]</code>.
</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">@interface</span> <span class="nc">IGListReloadDataUpdater</span> <span class="p">:</span> <span class="nc">NSObject</span> <span class="o"><</span><span class="n"><a href="Protocols/IGListUpdatingDelegate.html">IGListUpdatingDelegate</a></span><span class="o">></span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListReloadDataUpdater</span> <span class="p">:</span> <span class="kt">NSObject</span><span class="p">,</span> <span class="kt">ListUpdatingDelegate</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
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<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListSectionController"></a>
<a name="//apple_ref/objc/Class/IGListSectionController" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListSectionController">IGListSectionController</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The base class for section controllers used in a list. This class is intended to be subclassed.</p>
<a href="Classes/IGListSectionController.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListSectionController</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListSectionController</span> <span class="p">:</span> <span class="kt">NSObject</span></code></pre>
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</section>
</div>
</li>
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<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)IGListSingleSectionController"></a>
<a name="//apple_ref/objc/Class/IGListSingleSectionController" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)IGListSingleSectionController">IGListSingleSectionController</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>This section controller is meant to make building simple, single-cell lists easier. By providing the type of cell, a block
to configure the cell, and a block to return the size of a cell, you can use an <code><a href="Classes/IGListAdapter.html">IGListAdapter</a></code>-powered list with a
simpler architecture.</p>
<a href="Classes/IGListSingleSectionController.html" class="slightly-smaller">See more</a>
</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">@interface</span> <span class="nc">IGListSingleSectionController</span> <span class="p">:</span> <span class="nc"><a href="Classes/IGListSectionController.html">IGListSectionController</a></span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">ListSingleSectionController</span> <span class="p">:</span> <span class="kt">ListSectionController</span></code></pre>
</div>
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