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href="Enums/MGLFillExtrusionTranslationAnchor.html">MGLFillExtrusionTranslationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLFillTranslationAnchor" data-url="Enums/MGLFillTranslationAnchor.html"> + <a title="MGLFillTranslationAnchor" class="nav-group-task-link" href="Enums/MGLFillTranslationAnchor.html">MGLFillTranslationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLHillshadeIlluminationAnchor" data-url="Enums/MGLHillshadeIlluminationAnchor.html"> + <a title="MGLHillshadeIlluminationAnchor" class="nav-group-task-link" href="Enums/MGLHillshadeIlluminationAnchor.html">MGLHillshadeIlluminationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLIconAnchor" data-url="Enums/MGLIconAnchor.html"> + <a title="MGLIconAnchor" class="nav-group-task-link" href="Enums/MGLIconAnchor.html">MGLIconAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLIconPitchAlignment" data-url="Enums/MGLIconPitchAlignment.html"> + <a title="MGLIconPitchAlignment" class="nav-group-task-link" href="Enums/MGLIconPitchAlignment.html">MGLIconPitchAlignment</a> + </li> + <li class="nav-group-task" data-name="MGLIconRotationAlignment" data-url="Enums/MGLIconRotationAlignment.html"> + <a title="MGLIconRotationAlignment" class="nav-group-task-link" href="Enums/MGLIconRotationAlignment.html">MGLIconRotationAlignment</a> + </li> + <li class="nav-group-task" data-name="MGLIconTextFit" data-url="Enums/MGLIconTextFit.html"> + <a title="MGLIconTextFit" class="nav-group-task-link" href="Enums/MGLIconTextFit.html">MGLIconTextFit</a> + </li> + <li class="nav-group-task" data-name="MGLIconTranslationAnchor" data-url="Enums/MGLIconTranslationAnchor.html"> + <a title="MGLIconTranslationAnchor" class="nav-group-task-link" href="Enums/MGLIconTranslationAnchor.html">MGLIconTranslationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLLightAnchor" data-url="Enums/MGLLightAnchor.html"> + <a title="MGLLightAnchor" class="nav-group-task-link" href="Enums/MGLLightAnchor.html">MGLLightAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLLineCap" data-url="Enums/MGLLineCap.html"> + <a title="MGLLineCap" class="nav-group-task-link" href="Enums/MGLLineCap.html">MGLLineCap</a> + </li> + <li class="nav-group-task" data-name="MGLLineJoin" data-url="Enums/MGLLineJoin.html"> + <a title="MGLLineJoin" class="nav-group-task-link" href="Enums/MGLLineJoin.html">MGLLineJoin</a> + </li> + <li class="nav-group-task" data-name="MGLLineTranslationAnchor" data-url="Enums/MGLLineTranslationAnchor.html"> + <a title="MGLLineTranslationAnchor" class="nav-group-task-link" href="Enums/MGLLineTranslationAnchor.html">MGLLineTranslationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLMapDebugMaskOptions" data-url="Enums/MGLMapDebugMaskOptions.html"> + <a title="MGLMapDebugMaskOptions" class="nav-group-task-link" href="Enums/MGLMapDebugMaskOptions.html">MGLMapDebugMaskOptions</a> + </li> + <li class="nav-group-task" data-name="MGLRasterResamplingMode" data-url="Enums/MGLRasterResamplingMode.html"> + <a title="MGLRasterResamplingMode" class="nav-group-task-link" href="Enums/MGLRasterResamplingMode.html">MGLRasterResamplingMode</a> + </li> + <li class="nav-group-task" data-name="MGLResourceKind" data-url="Enums/MGLResourceKind.html"> + <a title="MGLResourceKind" class="nav-group-task-link" href="Enums/MGLResourceKind.html">MGLResourceKind</a> + </li> + <li class="nav-group-task" data-name="MGLSymbolPlacement" data-url="Enums/MGLSymbolPlacement.html"> + <a title="MGLSymbolPlacement" class="nav-group-task-link" href="Enums/MGLSymbolPlacement.html">MGLSymbolPlacement</a> + </li> + <li class="nav-group-task" data-name="MGLTextAnchor" data-url="Enums/MGLTextAnchor.html"> + <a title="MGLTextAnchor" class="nav-group-task-link" href="Enums/MGLTextAnchor.html">MGLTextAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLTextJustification" data-url="Enums/MGLTextJustification.html"> + <a title="MGLTextJustification" class="nav-group-task-link" href="Enums/MGLTextJustification.html">MGLTextJustification</a> + </li> + <li class="nav-group-task" data-name="MGLTextPitchAlignment" data-url="Enums/MGLTextPitchAlignment.html"> + <a title="MGLTextPitchAlignment" class="nav-group-task-link" href="Enums/MGLTextPitchAlignment.html">MGLTextPitchAlignment</a> + </li> + <li class="nav-group-task" data-name="MGLTextRotationAlignment" data-url="Enums/MGLTextRotationAlignment.html"> + <a title="MGLTextRotationAlignment" class="nav-group-task-link" href="Enums/MGLTextRotationAlignment.html">MGLTextRotationAlignment</a> + </li> + <li class="nav-group-task" data-name="MGLTextTransform" data-url="Enums/MGLTextTransform.html"> + <a title="MGLTextTransform" class="nav-group-task-link" href="Enums/MGLTextTransform.html">MGLTextTransform</a> + </li> + <li class="nav-group-task" data-name="MGLTextTranslationAnchor" data-url="Enums/MGLTextTranslationAnchor.html"> + <a title="MGLTextTranslationAnchor" class="nav-group-task-link" href="Enums/MGLTextTranslationAnchor.html">MGLTextTranslationAnchor</a> + </li> + <li class="nav-group-task" data-name="MGLTileCoordinateSystem" data-url="Enums/MGLTileCoordinateSystem.html"> + <a title="MGLTileCoordinateSystem" class="nav-group-task-link" href="Enums/MGLTileCoordinateSystem.html">MGLTileCoordinateSystem</a> + </li> + </ul> + </li> + <li class="nav-group-name" data-name="Other Protocols"> + <a class="small-heading" href="Other Protocols.html">Other Protocols<span class="anchor-icon" /></a> + <ul class="nav-group-tasks"> + <li class="nav-group-task" data-name="MGLComputedShapeSourceDataSource" data-url="Protocols/MGLComputedShapeSourceDataSource.html"> + <a title="MGLComputedShapeSourceDataSource" class="nav-group-task-link" href="Protocols/MGLComputedShapeSourceDataSource.html">MGLComputedShapeSourceDataSource</a> + </li> + <li class="nav-group-task" data-name="MGLOfflineStorageDelegate" data-url="Protocols/MGLOfflineStorageDelegate.html"> + <a title="MGLOfflineStorageDelegate" class="nav-group-task-link" href="Protocols/MGLOfflineStorageDelegate.html">MGLOfflineStorageDelegate</a> + </li> + </ul> + </li> + <li class="nav-group-name" data-name="Other Type Definitions"> + <a class="small-heading" href="Other Type Definitions.html">Other Type Definitions<span class="anchor-icon" /></a> + <ul class="nav-group-tasks"> + <li class="nav-group-task" data-name="MGLMapSnapshotCompletionHandler" data-url="Other Type Definitions.html#/c:MGLMapSnapshotter.h@T@MGLMapSnapshotCompletionHandler"> + <a title="MGLMapSnapshotCompletionHandler" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLMapSnapshotter.h@T@MGLMapSnapshotCompletionHandler">MGLMapSnapshotCompletionHandler</a> + </li> + <li class="nav-group-task" data-name="MGLOfflinePackAdditionCompletionHandler" data-url="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackAdditionCompletionHandler"> + <a title="MGLOfflinePackAdditionCompletionHandler" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackAdditionCompletionHandler">MGLOfflinePackAdditionCompletionHandler</a> + </li> + <li class="nav-group-task" data-name="MGLOfflinePackRemovalCompletionHandler" data-url="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackRemovalCompletionHandler"> + <a title="MGLOfflinePackRemovalCompletionHandler" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackRemovalCompletionHandler">MGLOfflinePackRemovalCompletionHandler</a> + </li> + <li class="nav-group-task" data-name="MGLOfflinePackUserInfoKey" data-url="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackUserInfoKey"> + <a title="MGLOfflinePackUserInfoKey" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLOfflineStorage.h@T@MGLOfflinePackUserInfoKey">MGLOfflinePackUserInfoKey</a> + </li> + <li class="nav-group-task" data-name="MGLShapeSourceOption" data-url="Other Type Definitions.html#/c:MGLShapeSource.h@T@MGLShapeSourceOption"> + <a title="MGLShapeSourceOption" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLShapeSource.h@T@MGLShapeSourceOption">MGLShapeSourceOption</a> + </li> + <li class="nav-group-task" data-name="MGLTileSourceOption" data-url="Other Type Definitions.html#/c:MGLTileSource.h@T@MGLTileSourceOption"> + <a title="MGLTileSourceOption" class="nav-group-task-link" href="Other Type Definitions.html#/c:MGLTileSource.h@T@MGLTileSourceOption">MGLTileSourceOption</a> + </li> + </ul> + </li> + <li class="nav-group-name" data-name="Other Functions"> + <a class="small-heading" href="Other Functions.html">Other Functions<span class="anchor-icon" /></a> + <ul class="nav-group-tasks"> + <li class="nav-group-task" data-name="MGLCoordinateQuadFromCoordinateBounds" data-url="Other Functions.html#/c:MGLGeometry.h@F@MGLCoordinateQuadFromCoordinateBounds"> + <a title="MGLCoordinateQuadFromCoordinateBounds" class="nav-group-task-link" href="Other Functions.html#/c:MGLGeometry.h@F@MGLCoordinateQuadFromCoordinateBounds">MGLCoordinateQuadFromCoordinateBounds</a> + </li> + <li class="nav-group-task" data-name="MGLCoordinateQuadMake" data-url="Other Functions.html#/c:MGLGeometry.h@F@MGLCoordinateQuadMake"> + <a title="MGLCoordinateQuadMake" class="nav-group-task-link" href="Other Functions.html#/c:MGLGeometry.h@F@MGLCoordinateQuadMake">MGLCoordinateQuadMake</a> + </li> + <li class="nav-group-task" data-name="MGLMapPointForCoordinate" data-url="Other Functions.html#/c:@F@MGLMapPointForCoordinate"> + <a title="MGLMapPointForCoordinate" class="nav-group-task-link" href="Other Functions.html#/c:@F@MGLMapPointForCoordinate">MGLMapPointForCoordinate</a> + </li> + <li class="nav-group-task" data-name="MGLMapPointMake" data-url="Other Functions.html#/c:MGLGeometry.h@F@MGLMapPointMake"> + <a title="MGLMapPointMake" class="nav-group-task-link" href="Other Functions.html#/c:MGLGeometry.h@F@MGLMapPointMake">MGLMapPointMake</a> + </li> + <li class="nav-group-task" data-name="MGLSphericalPositionMake" data-url="Other Functions.html#/c:MGLLight.h@F@MGLSphericalPositionMake"> + <a title="MGLSphericalPositionMake" class="nav-group-task-link" href="Other Functions.html#/c:MGLLight.h@F@MGLSphericalPositionMake">MGLSphericalPositionMake</a> + </li> + <li class="nav-group-task" data-name="MGLStringFromCoordinateQuad" data-url="Other Functions.html#/c:MGLGeometry.h@F@MGLStringFromCoordinateQuad"> + <a title="MGLStringFromCoordinateQuad" class="nav-group-task-link" href="Other Functions.html#/c:MGLGeometry.h@F@MGLStringFromCoordinateQuad">MGLStringFromCoordinateQuad</a> + </li> + <li class="nav-group-task" data-name="MGLTransitionMake" data-url="Other Functions.html#/c:MGLTypes.h@F@MGLTransitionMake"> + <a title="MGLTransitionMake" class="nav-group-task-link" href="Other Functions.html#/c:MGLTypes.h@F@MGLTransitionMake">MGLTransitionMake</a> + </li> + </ul> + </li> + <li class="nav-group-name" data-name="Other Structures"> + <a class="small-heading" href="Other Structures.html">Other Structures<span class="anchor-icon" /></a> + <ul class="nav-group-tasks"> + <li class="nav-group-task" data-name="MGLCoordinateQuad" data-url="Structs/MGLCoordinateQuad.html"> + <a title="MGLCoordinateQuad" class="nav-group-task-link" href="Structs/MGLCoordinateQuad.html">MGLCoordinateQuad</a> + </li> + <li class="nav-group-task" data-name="MGLSphericalPosition" data-url="Structs/MGLSphericalPosition.html"> + <a title="MGLSphericalPosition" class="nav-group-task-link" href="Structs/MGLSphericalPosition.html">MGLSphericalPosition</a> + </li> + <li class="nav-group-task" data-name="MGLTransition" data-url="Structs/MGLTransition.html"> + <a title="MGLTransition" class="nav-group-task-link" href="Structs/MGLTransition.html">MGLTransition</a> + </li> + </ul> + </li> + </ul> + </nav> + <article class="main-content"> + + <section class="section"> + <div class="section-content"> + + <h1 id='predicates-and-expressions' class='heading'>Predicates and expressions</h1> + +<p>Style layers use predicates and expressions to determine what to display and how +to format it. <em>Predicates</em> are represented by the same <code>NSPredicate</code> class that +filters results from Core Data or items in an <code>NSArray</code> in Objective-C. +Predicates are based on <em>expressions</em>, represented by the <code>NSExpression</code> class. +Somewhat unusually, style layers also use expressions on their own.</p> + +<p>This document discusses the specific subset of the predicate and expression +syntax supported by this SDK. For a more general introduction to predicates and +expressions, consult the +<em><a href="https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Predicates/AdditionalChapters/Introduction.html">Predicate Programming Guide</a></em> +in Apple developer documentation.</p> +<h2 id='using-predicates-to-filter-vector-data' class='heading'>Using predicates to filter vector data</h2> + +<p>Most style layer classes display <code><a href="Protocols/MGLFeature.html">MGLFeature</a></code> objects that you can show or hide +based on the feature’s attributes. Use the <code><a href="Classes/MGLVectorStyleLayer.html#/c:objc(cs)MGLVectorStyleLayer(py)predicate">MGLVectorStyleLayer.predicate</a></code> +property to include only the features in the source layer that satisfy a +condition that you define.</p> +<h3 id='operators' class='heading'>Operators</h3> + +<p>The following comparison operators are supported:</p> + +<table><thead> +<tr> +<th><code>NSPredicateOperatorType</code></th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>NSEqualToPredicateOperatorType</code></td> +<td><code>key = value</code><br /><code>key == value</code></td> +</tr> +<tr> +<td><code>NSGreaterThanOrEqualToPredicateOperatorType</code></td> +<td><code>key >= value</code><br /><code>key => value</code></td> +</tr> +<tr> +<td><code>NSLessThanOrEqualToPredicateOperatorType</code></td> +<td><code>key <= value</code><br /><code>key =< value</code></td> +</tr> +<tr> +<td><code>NSGreaterThanPredicateOperatorType</code></td> +<td><code>key > value</code></td> +</tr> +<tr> +<td><code>NSLessThanPredicateOperatorType</code></td> +<td><code>key < value</code></td> +</tr> +<tr> +<td><code>NSNotEqualToPredicateOperatorType</code></td> +<td><code>key != value</code><br /><code>key <> value</code></td> +</tr> +<tr> +<td><code>NSBetweenPredicateOperatorType</code></td> +<td><code>key BETWEEN { 32, 212 }</code></td> +</tr> +</tbody></table> + +<p>To test whether a feature has or lacks a specific attribute, compare the +attribute to <code>NULL</code> or <code>NIL</code>. Predicates created using the +<code>+[NSPredicate predicateWithValue:]</code> method are also supported. String +operators and custom operators are not supported.</p> + +<p>The following compound operators are supported:</p> + +<table><thead> +<tr> +<th><code>NSCompoundPredicateType</code></th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>NSAndPredicateType</code></td> +<td><code>predicate1 AND predicate2</code><br /><code>predicate1 && predicate2</code></td> +</tr> +<tr> +<td><code>NSOrPredicateType</code></td> +<td><code>predicate1 OR predicate2</code><br /><code>predicate1 || predicate2</code></td> +</tr> +<tr> +<td><code>NSNotPredicateType</code></td> +<td><code>NOT predicate</code><br /><code>!predicate</code></td> +</tr> +</tbody></table> + +<p>The following aggregate operators are supported:</p> + +<table><thead> +<tr> +<th><code>NSPredicateOperatorType</code></th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>NSInPredicateOperatorType</code></td> +<td><code>key IN { 'iOS', 'macOS', 'tvOS', 'watchOS' }</code></td> +</tr> +<tr> +<td><code>NSContainsPredicateOperatorType</code></td> +<td><code>{ 'iOS', 'macOS', 'tvOS', 'watchOS' } CONTAINS key</code></td> +</tr> +</tbody></table> + +<p>The following comparison predicate options are supported for comparison and +aggregate operators that are used in the predicate:</p> + +<table><thead> +<tr> +<th><code>NSComparisonPredicateOptions</code></th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>NSCaseInsensitivePredicateOption</code></td> +<td><code>'QUEBEC' =[c] 'Quebec'</code></td> +</tr> +<tr> +<td><code>NSDiacriticInsensitivePredicateOption</code></td> +<td><code>'Québec' =[d] 'Quebec'</code></td> +</tr> +</tbody></table> + +<p>Other comparison predicate options are unsupported, namely <code>l</code> +(for locale sensitivity) and <code>n</code> (for normalization). A comparison is +locale-sensitive as long as it is case- or diacritic-insensitive.</p> +<h3 id='operands' class='heading'>Operands</h3> + +<p>Operands in predicates can be <a href="#variables">variables</a>, <a href="#key-paths">key paths</a>, +or almost anything else that can appear +<a href="#using-expressions-to-configure-layout-and-paint-attributes">inside an expression</a>.</p> + +<p>Automatic type casting is not performed. Therefore, a feature only matches a +predicate if its value for the attribute in question is of the same type as the +value specified in the predicate. Use the <code>CAST()</code> operator to convert a key +path or variable into a matching type:</p> + +<ul> +<li>To cast a value to a number, use <code>CAST(key, 'NSNumber')</code>.</li> +<li>To cast a value to a string, use <code>CAST(key, 'NSString')</code>.</li> +<li>To cast a value to a color, use <code>CAST(key, 'UIColor')</code> on iOS and <code>CAST(key, 'NSColor')</code> on macOS.</li> +<li>To cast an <code>NSColor</code> or <code>UIColor</code> object to an array, use <code>CAST(noindex(color), 'NSArray')</code>.</li> +</ul> + +<p>For details about the predicate format string syntax, consult the “Predicate +Format String Syntax” chapter of the +<em><a href="https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Predicates/AdditionalChapters/Introduction.html">Predicate Programming Guide</a></em> +in Apple developer documentation.</p> +<h2 id='using-expressions-to-configure-layout-and-paint-attributes' class='heading'>Using expressions to configure layout and paint attributes</h2> + +<p>An expression can contain subexpressions of various types. Each of the supported +types of expressions is discussed below.</p> +<h3 id='constant-values' class='heading'>Constant values</h3> + +<p>A constant value can be of any of the following types:</p> + +<table><thead> +<tr> +<th>In Objective-C</th> +<th>In Swift</th> +</tr> +</thead><tbody> +<tr> +<td><code>NSColor</code> (macOS)<br><code>UIColor</code> (iOS)</td> +<td><code>NSColor</code> (macOS)<br><code>UIColor</code> (iOS)</td> +</tr> +<tr> +<td><code>NSString</code></td> +<td><code>String</code></td> +</tr> +<tr> +<td><code>NSString</code></td> +<td><code>String</code></td> +</tr> +<tr> +<td><code>NSNumber.boolValue</code></td> +<td><code>NSNumber.boolValue</code></td> +</tr> +<tr> +<td><code>NSNumber.doubleValue</code></td> +<td><code>NSNumber.doubleValue</code></td> +</tr> +<tr> +<td><code>NSArray<NSNumber></code></td> +<td><code>[Float]</code></td> +</tr> +<tr> +<td><code>NSArray<NSString></code></td> +<td><code>[String]</code></td> +</tr> +<tr> +<td><code>NSValue.CGVectorValue</code> (iOS)<br><code>NSValue</code> containing <code>CGVector</code> (macOS)</td> +<td><code>NSValue.cgVectorValue</code> (iOS)<br><code>NSValue</code> containing <code>CGVector</code> (macOS)</td> +</tr> +<tr> +<td><code>NSValue.UIEdgeInsetsValue</code> (iOS)<br><code>NSValue.edgeInsetsValue</code> (macOS)</td> +<td><code>NSValue.uiEdgeInsetsValue</code> (iOS)<br><code>NSValue.edgeInsetsValue</code> (macOS)</td> +</tr> +</tbody></table> + +<p>For literal floating-point values, use <code>-[NSNumber numberWithDouble:]</code> instead +of <code>-[NSNumber numberWithFloat:]</code> to avoid precision issues.</p> +<h3 id='key-paths' class='heading'>Key paths</h3> + +<p>A key path expression refers to an attribute of the <code><a href="Protocols/MGLFeature.html">MGLFeature</a></code> object being +evaluated for display. For example, if a polygon’s <code><a href="Protocols/MGLFeature.html#/c:objc(pl)MGLFeature(py)attributes">MGLFeature.attributes</a></code> +dictionary contains the <code>floorCount</code> key, then the key path <code>floorCount</code> refers +to the value of the <code>floorCount</code> attribute when evaluating that particular +polygon.</p> + +<p>The following special attribute is also available on features that are produced +as a result of clustering multiple point features together in a shape source:</p> + +<table> +<thead> +<tr><th>Attribute</th><th>Type</th><th>Meaning</th></tr> +</thead> +<tbody> +<tr> + <td><code>point_count</code></td> + <td>Number</td> + <td>The number of point features in a given cluster.</td> +</tr> +</tbody> +</table> + +<p>Some characters may not be used directly as part of a key path in a format +string. For example, if a feature’s attribute is named <code>ISO 3166-1:2006</code>, an +expression format string of <code>lowercase(ISO 3166-1:2006)</code> or a predicate format +string of <code>ISO 3166-1:2006 == 'US-OH'</code> would raise an exception. Instead, use a +<code>%K</code> placeholder or the <code>+[NSExpression expressionForKeyPath:]</code> initializer:</p> +<pre class="highlight objective_c"><code><span class="p">[</span><span class="n">NSPredicate</span> <span class="nf">predicateWithFormat</span><span class="p">:</span><span class="s">@"%K == 'US-OH'"</span><span class="p">,</span> <span class="s">@"ISO 3166-1:2006"</span><span class="p">];</span> +<span class="p">[</span><span class="n">NSExpression</span> <span class="nf">expressionForFunction</span><span class="p">:</span><span class="s">@"lowercase:"</span> + <span class="nf">arguments</span><span class="p">:@[[</span><span class="n">NSExpression</span> <span class="nf">expressionForKeyPath</span><span class="p">:</span><span class="s">@"ISO 3166-1:2006"</span><span class="p">]]]</span> +</code></pre> +<pre class="highlight swift"><code><span class="kt">NSPredicate</span><span class="p">(</span><span class="nv">format</span><span class="p">:</span> <span class="s">"%K == 'US-OH'"</span><span class="p">,</span> <span class="s">"ISO 3166-1:2006"</span><span class="p">)</span> +<span class="kt">NSExpression</span><span class="p">(</span><span class="nv">forFunction</span><span class="p">:</span> <span class="s">"lowercase:"</span><span class="p">,</span> + <span class="nv">arguments</span><span class="p">:</span> <span class="p">[</span><span class="kt">NSExpression</span><span class="p">(</span><span class="nv">forKeyPath</span><span class="p">:</span> <span class="s">"ISO 3166-1:2006"</span><span class="p">)])</span> +</code></pre> +<h3 id='functions' class='heading'>Functions</h3> + +<p>Of the +<a href="https://developer.apple.com/documentation/foundation/nsexpression/1413747-init#discussion">functions predefined</a> +by the +<a href="https://developer.apple.com/documentation/foundation/nsexpression/1413747-init"><code>+[NSExpression expressionForFunction:arguments:]</code> method</a>, +the following subset is supported in layer attribute values:</p> + +<table><thead> +<tr> +<th>Initializer parameter</th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>average:</code></td> +<td><code>average({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>sum:</code></td> +<td><code>sum({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>count:</code></td> +<td><code>count({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>min:</code></td> +<td><code>min({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>max:</code></td> +<td><code>max({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>add:to:</code></td> +<td><code>1 + 2</code></td> +</tr> +<tr> +<td><code>from:subtract:</code></td> +<td><code>2 - 1</code></td> +</tr> +<tr> +<td><code>multiply:by:</code></td> +<td><code>1 * 2</code></td> +</tr> +<tr> +<td><code>divide:by:</code></td> +<td><code>1 / 2</code></td> +</tr> +<tr> +<td><code>modulus:by:</code></td> +<td><code>modulus:by:(1, 2)</code></td> +</tr> +<tr> +<td><code>sqrt:</code></td> +<td><code>sqrt(2)</code></td> +</tr> +<tr> +<td><code>log:</code></td> +<td><code>log(10)</code></td> +</tr> +<tr> +<td><code>ln:</code></td> +<td><code>ln(2)</code></td> +</tr> +<tr> +<td><code>raise:toPower:</code></td> +<td><code>2 ** 2</code></td> +</tr> +<tr> +<td><code>exp:</code></td> +<td><code>exp(0)</code></td> +</tr> +<tr> +<td><code>ceiling:</code></td> +<td><code>ceiling(0.99999)</code></td> +</tr> +<tr> +<td><code>abs:</code></td> +<td><code>abs(-1)</code></td> +</tr> +<tr> +<td><code>trunc:</code></td> +<td><code>trunc(6378.1370)</code></td> +</tr> +<tr> +<td><code>floor:</code></td> +<td><code>floor(-0.99999)</code></td> +</tr> +<tr> +<td><code>uppercase:</code></td> +<td><code>uppercase('Elysian Fields')</code></td> +</tr> +<tr> +<td><code>lowercase:</code></td> +<td><code>lowercase('DOWNTOWN')</code></td> +</tr> +<tr> +<td><code>noindex:</code></td> +<td><code>noindex(0 + 2 + c)</code></td> +</tr> +<tr> +<td><code>length:</code></td> +<td><code>length('Wapakoneta')</code></td> +</tr> +<tr> +<td><code>castObject:toType:</code></td> +<td><code>CAST(ele, 'NSString')</code><br><code>CAST(ele, 'NSNumber')</code></td> +</tr> +</tbody></table> + +<p>A number of <a href="#mapbox-specific-functions">Mapbox-specific functions</a> are also +available.</p> + +<p>The following predefined functions are <strong>not</strong> supported:</p> + +<table><thead> +<tr> +<th>Initializer parameter</th> +<th>Format string syntax</th> +</tr> +</thead><tbody> +<tr> +<td><code>median:</code></td> +<td><code>median({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>mode:</code></td> +<td><code>mode({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>stddev:</code></td> +<td><code>stddev({1, 2, 2, 3, 4, 7, 9})</code></td> +</tr> +<tr> +<td><code>random</code></td> +<td><code>random()</code></td> +</tr> +<tr> +<td><code>randomn:</code></td> +<td><code>randomn(10)</code></td> +</tr> +<tr> +<td><code>now</code></td> +<td><code>now()</code></td> +</tr> +<tr> +<td><code>bitwiseAnd:with:</code></td> +<td><code>bitwiseAnd:with:(5, 3)</code></td> +</tr> +<tr> +<td><code>bitwiseOr:with:</code></td> +<td><code>bitwiseOr:with:(5, 3)</code></td> +</tr> +<tr> +<td><code>bitwiseXor:with:</code></td> +<td><code>bitwiseXor:with:(5, 3)</code></td> +</tr> +<tr> +<td><code>leftshift:by:</code></td> +<td><code>leftshift:by:(23, 1)</code></td> +</tr> +<tr> +<td><code>rightshift:by:</code></td> +<td><code>rightshift:by:(23, 1)</code></td> +</tr> +<tr> +<td><code>onesComplement:</code></td> +<td><code>onesComplement(255)</code></td> +</tr> +<tr> +<td><code>distanceToLocation:fromLocation:</code></td> +<td><code>distanceToLocation:fromLocation:(there, here)</code></td> +</tr> +</tbody></table> +<h3 id='conditionals' class='heading'>Conditionals</h3> + +<p>Conditionals are supported via the built-in +<code>+[NSExpression expressionForConditional:trueExpression:falseExpression:]</code> +method and <code>TERNARY()</code> operator. If you need to express multiple cases +(“else-if”), you can either nest a conditional within a conditional or use the +<a href="#code-mgl_if-code"><code>MGL_IF()</code></a> or <a href="#code-mgl_match-code"><code>MGL_MATCH()</code></a> function.</p> +<h3 id='aggregates' class='heading'>Aggregates</h3> + +<p>Aggregate expressions can contain arrays of expressions. In some cases, it is +possible to use the array itself instead of wrapping the array in an aggregate +expression.</p> +<h3 id='variables' class='heading'>Variables</h3> + +<p>The following variables are defined by this SDK for use with style layers:</p> + +<table> +<thead> +<tr><th>Variable</th><th>Type</th><th>Meaning</th></tr> +</thead> +<tbody> +<tr> + <td><code>$featureIdentifier</code></td> + <td> + Any + <a href="working-with-geojson-data.html#about-geojson-deserialization">GeoJSON data type</a> + </td> + <td> + A value that uniquely identifies the feature in the containing source. + This variable corresponds to the + <code>NSExpression.featureIdentifierVariableExpression</code> property. + </td> +</tr> +<tr> + <td><code>$geometryType</code></td> + <td>String</td> + <td> + The type of geometry represented by the feature. A feature’s type is one + of the following strings: + <ul> + <li> + <code>Point</code> for point features, corresponding to the + <code><a href="Classes/MGLPointAnnotation.html">MGLPointAnnotation</a></code> class + </li> + <li> + <code>LineString</code> for polyline features, corresponding to + the <code><a href="Classes/MGLPolyline.html">MGLPolyline</a></code> class + </li> + <li> + <code>Polygon</code> for polygon features, corresponding to the + <code><a href="Classes/MGLPolygon.html">MGLPolygon</a></code> class + </li> + </ul> + This variable corresponds to the + <code>NSExpression.geometryTypeVariableExpression</code> property. + </td> +</tr> +<tr> + <td><code>$heatmapDensity</code></td> + <td>Number</td> + <td> + The + <a href="https://en.wikipedia.org/wiki/Kernel_density_estimation">kernel density estimation</a> + of a screen point in a heatmap layer; in other words, a relative measure + of how many data points are crowded around a particular pixel. This + variable can only be used with the <code>heatmapColor</code> property. + This variable corresponds to the + <code>NSExpression.heatmapDensityVariableExpression</code> property. + </td> +</tr> +<tr> + <td><code>$zoomLevel</code></td> + <td>Number</td> + <td> + The current zoom level. In style layout and paint properties, this + variable may only appear as the target of a top-level interpolation or + step expression. This variable corresponds to the + <code>NSExpression.zoomLevelVariableExpression</code> property. + </td> +</tr> +</tbody> +</table> + +<p>In addition to these variables, you can define your own variables and refer to +them elsewhere in the expression. The syntax for defining a variable makes use +of a <a href="#mapbox-specific-functions">Mapbox-specific function</a> that takes an +<code>NSDictionary</code> as an argument:</p> +<pre class="highlight objective_c"><code><span class="p">[</span><span class="n">NSExpression</span> <span class="nf">expressionWithFormat</span><span class="p">:</span><span class="s">@"MGL_LET('floorCount', 2, $floorCount + 1)"</span><span class="p">];</span> +</code></pre> +<pre class="highlight swift"><code><span class="kt">NSExpression</span><span class="p">(</span><span class="nv">format</span><span class="p">:</span> <span class="s">"MGL_LET(floorCount, 2, $floorCount + 1)"</span><span class="p">)</span> +</code></pre> +<h2 id='mapbox-specific-functions' class='heading'>Mapbox-specific functions</h2> + +<p>For compatibility with the Mapbox Style Specification, the following functions +are defined by this SDK. When setting a style layer property, you can call these +functions just like the predefined functions above, using either the +<code>+[NSExpression expressionForFunction:arguments:]</code> method or a convenient format +string syntax:</p> +<h3 id='code-mgl_does-have-code' class='heading'><code>mgl_does:have:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_does:have:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_does:have:(SELF, '🧀🍔')</code> or <code>mgl_does:have:(%@, '🧀🍔')</code></dd> +</dl> + +<p>Returns a Boolean value indicating whether the dictionary has a value for the +key or whether the evaluated object (<code>SELF</code>) has a value for the feature +attribute. Compared to the <a href="#code-mgl_has-code"><code>mgl_has:</code></a> custom function, +that function’s target is instead passed in as the first argument to this +function. Both functions are equivalent to the syntax <code>key != NIL</code> or +<code>%@[key] != NIL</code> but can be used outside of a predicate.</p> +<h3 id='code-mgl_interpolate-withcurvetype-parameters-stops-code' class='heading'><code>mgl_interpolate:withCurveType:parameters:stops:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_interpolate:withCurveType:parameters:stops:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_interpolate:withCurveType:parameters:stops:(x, 'linear', nil, %@)</code></dd> +</dl> + +<p>Produces continuous, smooth results by interpolating between pairs of input and +output values (“stops”). Compared to the +<a href="#code-mgl_interpolatewithcurvetype-parameters-stops-code"><code>mgl_interpolateWithCurveType:parameters:stops:</code></a> +custom function, the input expression (that function’s target) is instead passed +in as the first argument to this function.</p> +<h3 id='code-mgl_step-from-stops-code' class='heading'><code>mgl_step:from:stops:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_step:from:stops:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_step:from:stops:(x, 11, %@)</code></dd> +</dl> + +<p>Produces discrete, stepped results by evaluating a piecewise-constant function +defined by pairs of input and output values (<q>stops</q>). Compared to the +<a href="#code-mgl_stepwithminimum-stops-code"><code>mgl_stepWithMinimum:stops:</code></a> custom +function, the input expression (that function’s target) is instead passed in as +the first argument to this function.</p> +<h3 id='code-mgl_join-code' class='heading'><code>mgl_join:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_join:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_join({'Old', 'MacDonald'})</code></dd> +</dl> + +<p>Returns the result of concatenating together all the elements of an array in +order. Compared to the +<a href="#code-stringbyappendingstring-code"><code>stringByAppendingString:</code></a> custom +function, this function takes only one argument, which is an aggregate +expression containing the strings to concatenate.</p> +<h3 id='code-mgl_acos-code' class='heading'><code>mgl_acos:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_acos:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_acos(1)</code></dd> +</dl> + +<p>Returns the arccosine of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-acos"><code>acos</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_asin-code' class='heading'><code>mgl_asin:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_asin:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_asin(0)</code></dd> +</dl> + +<p>Returns the arcsine of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-asin"><code>asin</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_atan-code' class='heading'><code>mgl_atan:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_atan:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_atan(20)</code></dd> +</dl> + +<p>Returns the arctangent of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-atan"><code>atan</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_cos-code' class='heading'><code>mgl_cos:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_cos:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_cos(0)</code></dd> +</dl> + +<p>Returns the cosine of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-cos"><code>cos</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_log2-code' class='heading'><code>mgl_log2:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_log2:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_log2(1024)</code></dd> +</dl> + +<p>Returns the base-2 logarithm of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-log2"><code>log2</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_round-code' class='heading'><code>mgl_round:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_round:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_round(1.5)</code></dd> +</dl> + +<p>Returns the number rounded to the nearest integer. If the number is halfway +between two integers, this function rounds it away from zero.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-round"><code>round</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_sin-code' class='heading'><code>mgl_sin:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_sin:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_sin(0)</code></dd> +</dl> + +<p>Returns the sine of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-sin"><code>sin</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_tan-code' class='heading'><code>mgl_tan:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_tan:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_tan(0)</code></dd> +</dl> + +<p>Returns the tangent of the number.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-tan"><code>tan</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_coalesce-code' class='heading'><code>mgl_coalesce:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_coalesce:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>mgl_coalesce({x, y, z})</code></dd> +</dl> + +<p>Returns the first non-<code>nil</code> value from an array of expressions.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-coalesce"><code>coalesce</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_let-code' class='heading'><code>MGL_LET</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>MGL_LET:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>MGL_LET('age', uppercase('old'), 'name', uppercase('MacDonald'), mgl_join({$age, $name}))</code></dd> +<dt>Arguments:</dt> +<dd> + Any number of variable names interspersed with their assigned + <code>NSExpression</code> values, followed by an <code>NSExpression</code> + that may contain references to those variables. +</dd> +</dl> + +<p>Returns the result of evaluating an expression with the given variable values. +Compared to the +<a href="#code-mgl_expressionwithcontext-code"><code>mgl_expressionWithContext:</code></a> custom +function, this function takes the variable names and values inline before the +expression that contains references to those variables.</p> +<h3 id='code-mgl_match-code' class='heading'><code>MGL_MATCH</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>MGL_MATCH:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>MGL_MATCH(x, 0, 'zero match', 1, 'one match', 2, 'two match', 'default')</code></dd> +<dt>Arguments:</dt> +<dd> + An input expression, then any number of argument pairs, followed by a default + expression. Each argument pair consists of a constant value followed by an + expression to produce as a result of matching that constant value. + If the input value is an aggregate expression, then any of the constant values within + that aggregate expression result in the following argument. This is shorthand for + specifying an argument pair for each of the constant values within that aggregate + expression. It is not possible to match the aggregate expression itself. +</dd> +</dl> + +<p>Returns the result of matching the input expression against the given constant +values.</p> + +<p>This function corresponds to the +<code><a href="Categories/NSExpression(MGLAdditions).html#/c:objc(cs)NSExpression(cm)mgl_expressionForMatchingExpression:inDictionary:defaultExpression:">+[NSExpression(MGLAdditions) mgl_expressionForMatchingExpression:inDictionary:defaultExpression:]</a></code> +method and the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-match"><code>match</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_if-code' class='heading'><code>MGL_IF</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>MGL_IF:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>MGL_IF(1 = 2, YES, 2 = 2, YES, NO)</code></dd> +<dt>Arguments:</dt> +<dd> + Alternating <code>NSPredicate</code> conditionals and resulting expressions, + followed by a default expression. +</dd> +</dl> + +<p>Returns the first expression that meets the condition; otherwise, the default +value. Unlike +<code>+[NSExpression expressionForConditional:trueExpression:falseExpression:]</code> or +the <code>TERNARY()</code> syntax, this function can accept multiple “if else” conditions +and is supported on iOS 8.<em>x</em> and macOS 10.10.<em>x</em>; however, each conditional +passed into this function must be wrapped in a constant expression.</p> + +<p>This function corresponds to the +<code><a href="Categories/NSExpression(MGLAdditions).html#/c:objc(cs)NSExpression(cm)mgl_expressionForConditional:trueExpression:falseExpresssion:">+[NSExpression(MGLAdditions) mgl_expressionForConditional:trueExpression:falseExpresssion:]</a></code> +method and the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-case"><code>case</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-mgl_function-code' class='heading'><code>MGL_FUNCTION</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>MGL_FUNCTION:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>MGL_FUNCTION('typeof', mystery)</code></dd> +<dt>Arguments:</dt> +<dd> + Any arguments required by the expression operator. +</dd> +</dl> + +<p>An expression exactly as defined by the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions">Mapbox Style Specification</a>.</p> +<h2 id='custom-functions' class='heading'>Custom functions</h2> + +<p>The following custom functions are also available with the +<code>+[NSExpression expressionForFunction:selectorName:arguments:]</code> method or the +<code>FUNCTION()</code> format string syntax.</p> + +<p>Some of these functions are defined as methods on their respective target +classes, but you should not call them directly outside the context of an +expression, because the result may differ from the evaluated expression’s result +or may result in undefined behavior.</p> + +<p>The Mapbox Style Specification defines some operators for which no custom +function is available. To use these operators in an <code>NSExpression</code>, call the +<a href="#code-mgl_function-code"><code>MGL_FUNCTION()</code></a> function with the same arguments +that the operator expects.</p> +<h3 id='code-boolvalue-code' class='heading'><code>boolValue</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>boolValue</code></dd> +<dt>Format string syntax:</dt> +<dd><code>FUNCTION(1, 'boolValue')</code></dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to a number or string. +</dd> +<dt>Arguments:</dt> +<dd>None.</dd> +</dl> + +<p>A Boolean representation of the target: <code>FALSE</code> when then input is an +empty string, 0, <code>FALSE</code>, <code>NIL</code>, or <code>NaN</code>, +otherwise <code>TRUE</code>.</p> +<h3 id='code-mgl_has-code' class='heading'><code>mgl_has:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_has:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>FUNCTION($featureAttributes, 'mgl_has:', '🧀🍔')</code></dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to an <code>NSDictionary</code> + or the evaluated object (<code>SELF</code>). +</dd> +<dt>Arguments:</dt> +<dd> + An <code>NSExpression</code> that evaluates to an <code>NSString</code> + representing the key to look up in the dictionary or the feature attribute to + look up in the evaluated object (see <code><a href="Protocols/MGLFeature.html#/c:objc(pl)MGLFeature(py)attributes">MGLFeature.attributes</a></code>). +</dd> +</dl> + +<p><code>true</code> if the dictionary has a value for the key or if the evaluated +object has a value for the feature attribute.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-has"><code>has</code></a> +operator in the Mapbox Style Specification. See also the +<a href="#code-mgl_does-have-code"><code>mgl_does:have:</code></a> function, which is used on its own +without the <code>FUNCTION()</code> operator. You can also check whether an object has an +attribute by comparing the key path to <code>NIL</code>, for example <code>cheeseburger != NIL</code> +or <code>burger.cheese != NIL</code></p> +<h3 id='code-mgl_expressionwithcontext-code' class='heading'><code>mgl_expressionWithContext:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_expressionWithContext:</code></dd> +<dt>Format string syntax:</dt> +<dd> + <code>FUNCTION($ios + $macos, 'mgl_expressionWithContext:', %@)</code> with + a dictionary containing <code>ios</code> and <code>macos</code> keys +</dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that may contain references to the variables + defined in the context dictionary. +</dd> +<dt>Arguments:</dt> +<dd> + An <code>NSDictionary</code> with <code>NSString</code>s as keys and + <code>NSExpression</code>s as values. Each key is a variable name and each + value is the variable’s value within the target expression. +</dd> +</dl> + +<p>The target expression with variable subexpressions replaced with the values +defined in the context dictionary.</p> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-let"><code>let</code></a> +operator in the Mapbox Style Specification. See also the +<a href="#code-mgl_let-code"><code>MGL_LET</code></a> function, which is used on its own without the +<code>FUNCTION()</code> operator.</p> +<h3 id='code-mgl_interpolatewithcurvetype-parameters-stops-code' class='heading'><code>mgl_interpolateWithCurveType:parameters:stops:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_interpolateWithCurveType:parameters:stops:</code></dd> +<dt>Format string syntax:</dt> +<dd> + <code>FUNCTION($zoomLevel, 'mgl_interpolateWithCurveType:parameters:stops:', 'linear', NIL, %@)</code> + with a dictionary containing zoom levels or other constant values as keys +</dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to a number and contains a + variable or key path expression. +</dd> +<dt>Arguments:</dt> +<dd> + The first argument is one of the following strings denoting curve types: + <code>linear</code>, <code>exponential</code>, or <code>cubic-bezier</code>. + + The second argument is an expression providing parameters for the curve: + + <ul> + <li>If the curve type is <code>linear</code>, the argument is <code>NIL</code>.</li> + <li> + If the curve type is <code>exponential</code>, the argument is an + expression that evaluates to a number, specifying the base of the + exponential interpolation. + </li> + <li> + If the curve type is <code>cubic-bezier</code>, the argument is an + array or aggregate expression containing four expressions, each + evaluating to a number. The four numbers are control points for the + cubic Bézier curve. + </li> + </ul> + + The third argument is an <code>NSDictionary</code> object representing the + interpolation’s stops, with numeric zoom levels as keys and expressions as + values. +</dd> +</dl> + +<p>A value interpolated along the continuous mathematical function defined by the +arguments, with the target as the input to the function.</p> + +<p>The input expression is matched against the keys in the stop dictionary. The +keys may be feature attribute values, zoom levels, or heatmap densities. The +values may be constant values or <code>NSExpression</code> objects. For example, you can +use a stop dictionary with the zoom levels 0, 10, and 20 as keys and the colors +yellow, orange, and red as the values.</p> + +<p>This function corresponds to the +<code><a href="Categories/NSExpression(MGLAdditions).html#/c:objc(cs)NSExpression(cm)mgl_expressionForInterpolatingExpression:withCurveType:parameters:stops:">+[NSExpression(MGLAdditions) mgl_expressionForInterpolatingExpression:withCurveType:parameters:stops:]</a></code> +method and the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-interpolate"><code>interpolate</code></a> +operator in the Mapbox Style Specification. See also the +<a href="#code-mgl_interpolate-withcurvetype-parameters-stops-code"><code>mgl_interpolate:withCurveType:parameters:stops:</code></a> +function, which is used on its own without the <code>FUNCTION()</code> operator.</p> +<h3 id='code-mgl_numberwithfallbackvalues-code' class='heading'><code>mgl_numberWithFallbackValues:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd> + <code>mgl_numberWithFallbackValues:</code>, + <code>doubleValue</code>, + <code>floatValue</code>, or + <code>decimalValue</code> +</dd> +<dt>Format string syntax:</dt> +<dd><code>FUNCTION(ele, 'mgl_numberWithFallbackValues:', 0)</code></dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to a Boolean value, number, or + string. +</dd> +<dt>Arguments:</dt> +<dd> + Zero or more <code>NSExpression</code>s, each evaluating to a Boolean value + or string. +</dd> +</dl> + +<p>A numeric representation of the target:</p> + +<ul> +<li>If the target is <code>NIL</code> or <code>FALSE</code>, the result is 0.</li> +<li>If the target is true, the result is 1. + +<ul> +<li>If the target is a string, it is converted to a number as specified by the +“<a href="https://tc39.github.io/ecma262/#sec-tonumber-applied-to-the-string-type">ToNumber Applied to the String Type</a>” +algorithm of the ECMAScript Language Specification.</li> +<li>If multiple values are provided, each one is evaluated in order until the +first successful conversion is obtained.</li> +</ul></li> +</ul> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-types-to-number"><code>to-number</code></a> +operator in the Mapbox Style Specification. You can also cast a value to a +number by passing the value and the string <code>NSNumber</code> into the <code>CAST()</code> +operator.</p> +<h3 id='code-mgl_stepwithminimum-stops-code' class='heading'><code>mgl_stepWithMinimum:stops:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>mgl_stepWithMinimum:stops:</code></dd> +<dt>Format string syntax:</dt> +<dd> + <code>FUNCTION($zoomLevel, 'mgl_stepWithMinimum:stops:', 0, %@)</code> with + a dictionary with zoom levels or other constant values as keys +</dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to a number and contains a + variable or key path expression. +</dd> +<dt>Arguments:</dt> +<dd> + The first argument is an expression that evaluates to a number, specifying + the minimum value in case the target is less than any of the stops in the + second argument. + + The second argument is an <code>NSDictionary</code> object representing the + interpolation’s stops, with numeric zoom levels as keys and expressions as + values. +</dd> +</dl> + +<p>The output value of the stop whose key is just less than the evaluated target, +or the minimum value if the target is less than the least of the stops’ keys.</p> + +<p>The input expression is matched against the keys in the stop dictionary. The +keys may be feature attribute values, zoom levels, or heatmap densities. The +values may be constant values or <code>NSExpression</code> objects. For example, you can +use a stop dictionary with the zoom levels 0, 10, and 20 as keys and the colors +yellow, orange, and red as the values.</p> + +<p>This function corresponds to the +<code><a href="Categories/NSExpression(MGLAdditions).html#/c:objc(cs)NSExpression(cm)mgl_expressionForSteppingExpression:fromExpression:stops:">+[NSExpression(MGLAdditions) mgl_expressionForSteppingExpression:fromExpression:stops:]</a></code> +method and the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-step"><code>step</code></a> +operator in the Mapbox Style Specification.</p> +<h3 id='code-stringbyappendingstring-code' class='heading'><code>stringByAppendingString:</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>stringByAppendingString:</code></dd> +<dt>Format string syntax:</dt> +<dd><code>FUNCTION('Old', 'stringByAppendingString:', 'MacDonald')</code></dd> +<dt>Target:</dt> +<dd>An <code>NSExpression</code> that evaluates to a string.</dd> +<dt>Arguments:</dt> +<dd>One or more <code>NSExpression</code>s, each evaluating to a string.</dd> +</dl> + +<p>The target string with each of the argument strings appended in order.</p> + +<p>This function corresponds to the +<code><a href="Categories/NSExpression(MGLAdditions).html#/c:objc(cs)NSExpression(im)mgl_expressionByAppendingExpression:">-[NSExpression(MGLAdditions) mgl_expressionByAppendingExpression:]</a></code> +method and is similar to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-concat"><code>concat</code></a> +operator in the Mapbox Style Specification. See also the +<a href="#code-mgl_join-code"><code>mgl_join:</code></a> function, which concatenates multiple +expressions and is used on its own without the <code>FUNCTION()</code> operator.</p> +<h3 id='code-stringvalue-code' class='heading'><code>stringValue</code></h3> + +<dl> +<dt>Selector:</dt> +<dd><code>stringValue</code></dd> +<dt>Format string syntax:</dt> +<dd><code>FUNCTION(ele, 'stringValue')</code></dd> +<dt>Target:</dt> +<dd> + An <code>NSExpression</code> that evaluates to a Boolean value, number, or + string. +</dd> +<dt>Arguments:</dt> +<dd>None.</dd> +</dl> + +<p>A string representation of the target:</p> + +<ul> +<li>If the target is <code>NIL</code>, the result is the empty string.</li> +<li>If the target is a Boolean value, the result is the string <code>true</code> or <code>false</code>.</li> +<li>If the target is a number, it is converted to a string as specified by the +“<a href="https://tc39.github.io/ecma262/#sec-tostring-applied-to-the-number-type">NumberToString</a>” +algorithm of the ECMAScript Language Specification.</li> +<li>If the target is a color, it is converted to a string of the form +<code>rgba(r,g,b,a)</code>, where <var>r</var>, <var>g</var>, and <var>b</var> are +numerals ranging from 0 to 255 and <var>a</var> ranges from 0 to 1.</li> +<li>Otherwise, the target is converted to a string in the format specified by the +<a href="https://tc39.github.io/ecma262/#sec-json.stringify"><code>JSON.stringify()</code></a> +function of the ECMAScript Language Specification.</li> +</ul> + +<p>This function corresponds to the +<a href="https://www.mapbox.com/mapbox-gl-js/style-spec/#expressions-types-to-string"><code>to-string</code></a> +operator in the Mapbox Style Specification. You can also cast a value to a +string by passing the value and the string <code>NSString</code> into the <code>CAST()</code> +operator.</p> + + </div> + </section> + + + </article> + </div> + <section class="footer limiter"> + <p>© 2014–2018 <a class="link" href="https://www.mapbox.com/" target="_blank" rel="external">Mapbox</a>. See <a class="link" href="https://github.com/mapbox/mapbox-gl-native/blob/master/LICENSE.md" target="_blank" rel="external">license</a> for more details.</p> Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external">jazzy ♪♫ v0.9.3</a>, a <a class="link" href="http://realm.io" target="_blank" rel="external">Realm</a> project. + </section> + </body> +</div> +</html> |