62dd097328
* [ios, macos] Add NSAndPredicateType predicate expression filter. * [ios, macos] Add type to NSPredicate expressions. * [ios, macos] Add Expression filter support. * [ios, macos] Update NSPredicate expression based tests. * [ios, macos] Refactor ExpressionFilters. * [ios, macos] Add symmetric test to ExpressionFilters. * [ios, macos] Update NSPredicate test to ExpressionFilters. * [ios, macos] Re-introduce Filter tests. * [ios, macos] Remove typed NSComparisonPredicate's comparable values. * [ios, macos] Update style layers predicate tests. * [ios, macos] Remove unused predicate conversion code. * [ios, macos] Update documentation exaple's test. * [ios, macos] Update Predicate and Expressions guide.. * [ios, macos] Remove mgl_ prefix from variable expressions. * [ios, macos] Update predicates and expressions documentation. * [ios, macos] Update changelogs.
59 lines
2.0 KiB
Objective-C
59 lines
2.0 KiB
Objective-C
#import <Foundation/Foundation.h>
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#import "MGLFoundation.h"
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#import "MGLForegroundStyleLayer.h"
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NS_ASSUME_NONNULL_BEGIN
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/**
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`MGLVectorStyleLayer` is an abstract superclass for style layers whose content
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is defined by an `MGLShapeSource` or `MGLVectorTileSource` object.
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Create instances of `MGLCircleStyleLayer`, `MGLFillStyleLayer`,
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`MGLFillExtrusionStyleLayer`, `MGLHeatmapStyleLayer`, `MGLLineStyleLayer`, and
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`MGLSymbolStyleLayer` in order to use `MGLVectorStyleLayer`'s properties and
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methods. Do not create instances of `MGLVectorStyleLayer` directly, and do not
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create your own subclasses of this class.
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*/
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MGL_EXPORT
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@interface MGLVectorStyleLayer : MGLForegroundStyleLayer
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#pragma mark Refining a Style Layer’s Content
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/**
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Identifier of the layer within the source identified by the `sourceIdentifier`
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property from which the receiver obtains the data to style.
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*/
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@property (nonatomic, nullable) NSString *sourceLayerIdentifier;
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/**
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The style layer’s predicate.
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Use the style layer’s predicate to include only the features in the source
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layer that satisfy a condition that you define. If the style layer initially
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comes from the style, its predicate corresponds to the
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<a href="https://www.mapbox.com/mapbox-gl-style-spec/#layer-filter">`filter`</a>
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property in the style JSON.
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See the “<a href="../predicates-and-expressions.html">Predicates and Expressions</a>”
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guide for details about the predicate syntax supported by this class.
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### Example
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To filter the layer to include only the features whose `index` attribute is 5
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or 10 and whose `ele` attribute is at least 1,500, you could create an
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`NSCompoundPredicate` along these lines:
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```swift
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let layer = MGLLineStyleLayer(identifier: "contour", source: terrain)
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layer.sourceLayerIdentifier = "contours"
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layer.predicate = NSPredicate(format: "(index == 5 || index == 10) && CAST(ele, 'NSNumber') >= 1500.0")
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mapView.style?.addLayer(layer)
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```
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*/
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@property (nonatomic, nullable) NSPredicate *predicate;
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@end
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NS_ASSUME_NONNULL_END
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