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GREYLayoutConstraint Class Reference
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<a href="../Functions.html#/c:@F@grey_respondsToSelector">grey_respondsToSelector</a>
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<a href="../Functions.html#/c:@F@grey_scrollInDirection">grey_scrollInDirection</a>
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<a href="../Functions.html#/c:@F@grey_scrollInDirectionWithStartPoint">grey_scrollInDirectionWithStartPoint</a>
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<a href="../Functions.html#/c:@F@grey_scrollToContentEdge">grey_scrollToContentEdge</a>
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<a href="../Functions.html#/c:@F@grey_scrollToContentEdgeWithStartPoint">grey_scrollToContentEdgeWithStartPoint</a>
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<a href="../Functions.html#/c:@F@grey_scrollViewContentOffset">grey_scrollViewContentOffset</a>
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<a href="../Functions.html#/c:@F@grey_scrolledToContentEdge">grey_scrolledToContentEdge</a>
</li>
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<a href="../Functions.html#/c:@F@grey_selected">grey_selected</a>
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<a href="../Functions.html#/c:@F@grey_setDate">grey_setDate</a>
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<article class="main-content">
<section>
<section class="section">
<h1>GREYLayoutConstraint</h1>
<div class="declaration">
<div class="language">
<pre class="highlight"><code><span class="k">@interface</span> <span class="nc">GREYLayoutConstraint</span> <span class="p">:</span> <span class="nc">NSObject</span></code></pre>
</div>
</div>
<p>Modeled after NSLayoutConstraint, this class captures information related to a layout
constraint: two attributes and a relation that must be satisfied between them.</p>
</section>
<section class="section task-group-section">
<div class="task-group">
<ul>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(cm)layoutConstraintWithAttribute:relatedBy:toReferenceAttribute:multiplier:constant:"></a>
<a name="//apple_ref/objc/Method/+layoutConstraintWithAttribute:relatedBy:toReferenceAttribute:multiplier:constant:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(cm)layoutConstraintWithAttribute:relatedBy:toReferenceAttribute:multiplier:constant:">+layoutConstraintWithAttribute:relatedBy:toReferenceAttribute:multiplier:constant:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Creates a GREYLayoutConstraint to verify a constraint attribute on an element. The relation is
given by : @c attribute value = @c referenceAttribute * @c multiplier + @c constant.</p>
<p>For example, with constraint relation @c kGREYLayoutRelationEqual, multiplier 2.0 and
constant 10.0, the attribute values of 20.0 and 5.0 satisfy the constraint because:
20.0 = 5.0 * 2.0 + 10.0 but 30.0 and 40.0 don&rsquo;t because 30.0 != 40.0 * 2.0 + 10.0.</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">instancetype</span><span class="p">)</span><span class="nf">layoutConstraintWithAttribute</span><span class="p">:(</span><span class="n"><a href="../Enums/GREYLayoutAttribute.html">GREYLayoutAttribute</a></span><span class="p">)</span><span class="nv">attribute</span>
<span class="nf">relatedBy</span><span class="p">:(</span><span class="n"><a href="../Enums/GREYLayoutRelation.html">GREYLayoutRelation</a></span><span class="p">)</span><span class="nv">relation</span>
<span class="nf">toReferenceAttribute</span><span class="p">:</span>
<span class="p">(</span><span class="n"><a href="../Enums/GREYLayoutAttribute.html">GREYLayoutAttribute</a></span><span class="p">)</span><span class="nv">referenceAttribute</span>
<span class="nf">multiplier</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">multiplier</span>
<span class="nf">constant</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">constant</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="n">convenience</span> <span class="nf">init</span><span class="o">!</span><span class="p">(</span><span class="nv">attribute</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="n">relatedBy</span> <span class="nv">relation</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="n">toReferenceAttribute</span> <span class="nv">referenceAttribute</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="nv">multiplier</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="nv">constant</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>attribute</em>
</code>
</td>
<td>
<div>
<p>A layout attribute to create the constraint from.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>relation</em>
</code>
</td>
<td>
<div>
<p>The GREYLayoutRelation between the @c attribute and
the @c referenceAttribute</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>referenceAttribute</em>
</code>
</td>
<td>
<div>
<p>The layout attribute whose relation is being checked
with respect to @attribute.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>multiplier</em>
</code>
</td>
<td>
<div>
<p>Value to multiply the @c referenceAttribute value.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>constant</em>
</code>
</td>
<td>
<div>
<p>Any constant to be added to the relation being checked.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A GREYLayoutConstraint instance, that constrains an element&rsquo;s attribute with
respect to a reference.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(cm)layoutConstraintForDirection:andMinimumSeparation:"></a>
<a name="//apple_ref/objc/Method/+layoutConstraintForDirection:andMinimumSeparation:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(cm)layoutConstraintForDirection:andMinimumSeparation:">+layoutConstraintForDirection:andMinimumSeparation:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Creates a GREYLayoutConstraint that checks the position of a UI element with respect to a
particular direction</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">instancetype</span><span class="p">)</span><span class="nf">layoutConstraintForDirection</span><span class="p">:(</span><span class="n"><a href="../Enums/GREYLayoutDirection.html">GREYLayoutDirection</a></span><span class="p">)</span><span class="nv">direction</span>
<span class="nf">andMinimumSeparation</span><span class="p">:(</span><span class="n">CGFloat</span><span class="p">)</span><span class="nv">separation</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="n">convenience</span> <span class="nf">init</span><span class="o">!</span><span class="p">(</span><span class="n">forDirection</span> <span class="nv">direction</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="n">andMinimumSeparation</span> <span class="nv">separation</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>direction</em>
</code>
</td>
<td>
<div>
<p>The direction being checked against the reference element.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>separation</em>
</code>
</td>
<td>
<div>
<p>The separation between an element and an edge in the given @c direction.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A GREYLayoutConstraint instance that constrains an element to a particular direction.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(im)init"></a>
<a name="//apple_ref/objc/Method/-init" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(im)init">-init</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>@remark init is not an available initializer. Use the other initializers.</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">instancetype</span><span class="p">)</span><span class="n">init</span><span class="p">;</span></code></pre>
</div>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight"><code><span class="nf">init</span><span class="o">!</span><span class="p">()</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(im)satisfiedByElement:andReferenceElement:"></a>
<a name="//apple_ref/objc/Method/-satisfiedByElement:andReferenceElement:" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(im)satisfiedByElement:andReferenceElement:">-satisfiedByElement:andReferenceElement:</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Checks if the given element satisfies the provided constraints, as shown by a reference element.</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">BOOL</span><span class="p">)</span><span class="nf">satisfiedByElement</span><span class="p">:(</span><span class="n">id</span><span class="p">)</span><span class="nv">element</span> <span class="nf">andReferenceElement</span><span class="p">:(</span><span class="n">id</span><span class="p">)</span><span class="nv">referenceElement</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">satisfied</span><span class="p">(</span><span class="n">byElement</span> <span class="nv">element</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">,</span> <span class="n">andReferenceElement</span> <span class="nv">referenceElement</span><span class="p">:</span> <span class="kt">Any</span><span class="o">!</span><span class="p">)</span> <span class="o">-&gt;</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>element</em>
</code>
</td>
<td>
<div>
<p>The element being checked for the constraints.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>referenceElement</em>
</code>
</td>
<td>
<div>
<p>The reference element to check the @c element against.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>@c YES if the the given elements satisify the constraint, else @NO.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(im)description"></a>
<a name="//apple_ref/objc/Method/-description" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(im)description">-description</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</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">NSString</span> <span class="o">*</span><span class="p">)</span><span class="n">description</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">description</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kt">Any</span><span class="o">!</span></code></pre>
</div>
</div>
<div>
<h4>Return Value</h4>
<p>A description of the GREYLayoutConstraint created.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/c:objc(cs)GREYLayoutConstraint(py)attribute"></a>
<a name="//apple_ref/objc/Property/attribute" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(py)attribute">attribute</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The attribute constraint being checked.</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/GREYLayoutAttribute.html">GREYLayoutAttribute</a></span> <span class="n">attribute</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">attribute</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)GREYLayoutConstraint(py)relation"></a>
<a name="//apple_ref/objc/Property/relation" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(py)relation">relation</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The GREYLayoutRelation between the @c attribute and the @c referenceAttribute.</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/GREYLayoutRelation.html">GREYLayoutRelation</a></span> <span class="n">relation</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">relation</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)GREYLayoutConstraint(py)referenceAttribute"></a>
<a name="//apple_ref/objc/Property/referenceAttribute" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(py)referenceAttribute">referenceAttribute</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The value the @c attribute is being compared to.</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/GREYLayoutAttribute.html">GREYLayoutAttribute</a></span> <span class="n">referenceAttribute</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">referenceAttribute</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)GREYLayoutConstraint(py)multiplier"></a>
<a name="//apple_ref/objc/Property/multiplier" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(py)multiplier">multiplier</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Value to multiply the @c referenceAttribute value with.</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">CGFloat</span> <span class="n">multiplier</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">multiplier</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)GREYLayoutConstraint(py)constant"></a>
<a name="//apple_ref/objc/Property/constant" class="dashAnchor"></a>
<a class="token" href="#/c:objc(cs)GREYLayoutConstraint(py)constant">constant</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Any constant to be added to the relation being checked.</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">CGFloat</span> <span class="n">constant</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">constant</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>
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