@interface MGLShapeSource : MGLAbstractShapeSource

MGLShapeSource is a map content source that supplies vector shapes to be shown on the map. The shapes may be instances of MGLShape or MGLFeature, or they may be defined by local or external GeoJSON code. A shape source is added to an MGLStyle object along with an MGLVectorStyleLayer object. The vector style layer defines the appearance of any content supplied by the shape source. You can update a shape source by setting its shape or URL property.

Each geojson source defined by the style JSON file is represented at runtime by an MGLShapeSource object that you can use to refine the map’s content and initialize new style layers. You can also add and remove sources dynamically using methods such as -[MGLStyle addSource:] and -[MGLStyle sourceWithIdentifier:].

Any vector style layer initialized with a shape source should have a nil value in its sourceLayerIdentifier property.


var coordinates: [CLLocationCoordinate2D] = [
    CLLocationCoordinate2D(latitude: 37.77, longitude: -122.42),
    CLLocationCoordinate2D(latitude: 38.91, longitude: -77.04),
let polyline = MGLPolylineFeature(coordinates: &coordinates, count: UInt(coordinates.count))
let source = MGLShapeSource(identifier: "lines", features: [polyline], options: nil)
  • The contents of the source. A shape can represent a GeoJSON geometry, a feature, or a collection of features.

    If the receiver was initialized using -initWithIdentifier:URL:options:, this property is set to nil. This property is unavailable until the receiver is passed into -[MGLStyle addSource:].

    You can get/set the shapes within a collection via this property. Actions must be performed on the application’s main thread.



    @property (readwrite, copy, nonatomic, nullable) MGLShape *shape;


    @NSCopying var shape: MGLShape? { get set }
  • URL

    The URL to the GeoJSON document that specifies the contents of the source.

    If the receiver was initialized using -initWithIdentifier:shape:options:, this property is set to nil.



    @property (readwrite, copy, nonatomic, nullable) NSURL *URL;


    var url: URL? { get set }
  • Returns an array of map features for this source, filtered by the given predicate.

    Each object in the returned array represents a feature for the current style and provides access to attributes specified via the shape property.

    Features come from tiled GeoJSON data that is converted to tiles internally, so feature geometries are clipped at tile boundaries and features may appear duplicated across tiles. For example, suppose this source contains a long polyline representing a road. The resulting array includes those parts of the road that lie within the map tiles that the source has loaded, even if the road extends into other tiles. The portion of the road within each map tile is included individually.

    Returned features may not necessarily be visible to the user at the time they are loaded: the style may lack a layer that draws the features in question. To obtain only visible features, use the -[MGLMapView visibleFeaturesAtPoint:inStyleLayersWithIdentifiers:predicate:] or -[MGLMapView visibleFeaturesInRect:inStyleLayersWithIdentifiers:predicate:] method.



    - (nonnull NSArray<id<MGLFeature>> *)featuresMatchingPredicate:
        (nullable NSPredicate *)predicate;



    A predicate to filter the returned features. Use nil to include all features in the source.

    Return Value

    An array of objects conforming to the MGLFeature protocol that represent features in the source that match the predicate.