20d9e1028c
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Bart Louwers <bart@emeel.net>
59 lines
2.0 KiB
Objective-C
59 lines
2.0 KiB
Objective-C
#import <Foundation/Foundation.h>
|
||
|
||
#import "MLNFoundation.h"
|
||
#import "MLNForegroundStyleLayer.h"
|
||
|
||
NS_ASSUME_NONNULL_BEGIN
|
||
|
||
/**
|
||
`MLNVectorStyleLayer` is an abstract superclass for style layers whose content
|
||
is defined by an `MLNShapeSource` or `MLNVectorTileSource` object.
|
||
|
||
Create instances of `MLNCircleStyleLayer`, `MLNFillStyleLayer`,
|
||
`MLNFillExtrusionStyleLayer`, `MLNHeatmapStyleLayer`, `MLNLineStyleLayer`, and
|
||
`MLNSymbolStyleLayer` in order to use `MLNVectorStyleLayer`'s properties and
|
||
methods. Do not create instances of `MLNVectorStyleLayer` directly, and do not
|
||
create your own subclasses of this class.
|
||
*/
|
||
MLN_EXPORT
|
||
@interface MLNVectorStyleLayer : MLNForegroundStyleLayer
|
||
|
||
// MARK: Refining a Style Layer’s Content
|
||
|
||
/**
|
||
Identifier of the layer within the source identified by the `sourceIdentifier`
|
||
property from which the receiver obtains the data to style.
|
||
*/
|
||
@property (nonatomic, nullable) NSString *sourceLayerIdentifier;
|
||
|
||
/**
|
||
The style layer’s predicate.
|
||
|
||
Use the style layer’s predicate to include only the features in the source
|
||
layer that satisfy a condition that you define. If the style layer initially
|
||
comes from the style, its predicate corresponds to the
|
||
<a href="https://maplibre.org/maplibre-style-spec/#layer-filter">`filter`</a>
|
||
property in the style JSON.
|
||
|
||
See the “<a href="../predicates-and-expressions.html">Predicates and Expressions</a>”
|
||
guide for details about the predicate syntax supported by this class.
|
||
|
||
### Example
|
||
|
||
To filter the layer to include only the features whose `index` attribute is 5
|
||
or 10 and whose `ele` attribute is at least 1,500, you could create an
|
||
`NSCompoundPredicate` along these lines:
|
||
|
||
```swift
|
||
let layer = MLNLineStyleLayer(identifier: "contour", source: terrain)
|
||
layer.sourceLayerIdentifier = "contours"
|
||
layer.predicate = NSPredicate(format: "(index == 5 || index == 10) && CAST(ele, 'NSNumber') >= 1500.0")
|
||
mapView.style?.addLayer(layer)
|
||
```
|
||
*/
|
||
@property (nonatomic, nullable) NSPredicate *predicate;
|
||
|
||
@end
|
||
|
||
NS_ASSUME_NONNULL_END
|