DingiVectorStyleLayer

 

@interface DingiVectorStyleLayer : DingiForegroundStyleLayer

DingiVectorStyleLayer is an abstract superclass for style layers whose content is defined by an DingiShapeSource or DingiVectorTileSource object.

Create instances of DingiCircleStyleLayer, DingiFillStyleLayer, DingiFillExtrusionStyleLayer, DingiHeatmapStyleLayer, DingiLineStyleLayer, and DingiSymbolStyleLayer in order to use DingiVectorStyleLayer‘s properties and methods. Do not create instances of DingiVectorStyleLayer directly, and do not create your own subclasses of this class.

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.

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic, nullable)
    NSString *sourceLayerIdentifier;

    Swift

    var sourceLayerIdentifier: String? { get set }

  • 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 filter property in the style JSON.

    See the “Predicates and Expressions” 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:

    let layer = DingiLineStyleLayer(identifier: "contour", source: terrain)
layer.sourceLayerIdentifier = "contours"
layer.predicate = NSPredicate(format: "(index == 5 || index == 10) && CAST(ele, 'NSNumber') >= 1500.0")
mapView.style?.addLayer(layer)

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic, nullable) NSPredicate *predicate;

    Swift

    var predicate: NSPredicate? { get set }