MLNFeature class interface

The MLNFeature protocol is used to provide details about geographic features contained in an MLNShapeSource or MLNVectorTileSource object. Each concrete subclass of MLNShape in turn has a subclass that conforms to this protocol. A feature object associates a shape with an optional identifier and attributes.

You can add custom data to display on the map by creating feature objects and adding them to an MLNShapeSource using the MLNShapeSource/initWithIdentifier:shape:options: method or MLNShapeSource/shape property.

In addition to adding data to the map, you can also extract data from the map: MLNMapView/visibleFeaturesAtPoint: and related methods return feature objects that correspond to features in the source. This enables you to inspect the properties of features in vector tiles loaded by MLNVectorTileSource objects. You also reuse these feature objects as overlay annotations.

While it is possible to add MLNFeature-conforming objects to the map as annotations using MLNMapView/addAnnotations: and related methods, doing so has trade-offs:

Features added as annotations will not have identifier or attributes properties when used with feature querying.
Features added as annotations become interactive. Taps and selection can be handled in MLNMapViewDelegate/mapView:didSelectAnnotation:.

Implemented types

MLNAnnotation

Implementers

Constructors

MLNFeature.castFrom(ObjCObjectBase other): Constructs a MLNFeature that points to the same underlying object as other.
MLNFeature.castFromPointer(Pointer<ObjCObject> other, {bool retain = false, bool release = false}): Constructs a MLNFeature that wraps the given raw object pointer.

Properties

hashCode → int: The hash code for this object.
no setterinherited
ref → ObjCObjectRef: finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Properties

$protocol → Protocol: Returns the objc.Protocol object for this protocol.
no setter
attributeForKey_ → ObjCProtocolMethod<ObjCObjectBase? Function(NSString)>: Returns the feature attribute for the given attribute name.
final
attributes → ObjCProtocolMethod<NSDictionary Function()>: A dictionary of attributes for this feature.
final
coordinate → ObjCProtocolMethod<CLLocationCoordinate2D Function()>: The center point (specified as a map coordinate) of the annotation. (required) (read-only)
final
geoJSONDictionary → ObjCProtocolMethod<NSDictionary Function()>: Returns a dictionary that can be serialized as a GeoJSON Feature representation of an instance of an MLNFeature subclass.
final
identifier → ObjCProtocolMethod<ObjCObjectBase? Function()>: An object that uniquely identifies the feature in its containing content source.
final
setAttributes_ → ObjCProtocolListenableMethod<void Function(NSDictionary)>: A dictionary of attributes for this feature.
final
setIdentifier_ → ObjCProtocolListenableMethod<void Function(ObjCObjectBase?)>: An object that uniquely identifies the feature in its containing content source.
final
subtitle → ObjCProtocolMethod<NSString? Function()>: The string containing the annotation’s subtitle.
final
title → ObjCProtocolMethod<NSString? Function()>: The string containing the annotation’s title.
final

Static Methods

addToBuilder(ObjCProtocolBuilder builder, {required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → void: Adds the implementation of the MLNFeature protocol to an existing objc.ObjCProtocolBuilder.
override
addToBuilderAsBlocking(ObjCProtocolBuilder builder, {required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → void: Adds the implementation of the MLNFeature protocol to an existing objc.ObjCProtocolBuilder. All methods that can be implemented as blocking listeners will be.
addToBuilderAsListener(ObjCProtocolBuilder builder, {required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → void: Adds the implementation of the MLNFeature protocol to an existing objc.ObjCProtocolBuilder. All methods that can be implemented as listeners will be.
conformsTo(ObjCObjectBase obj) → bool: Returns whether obj is an instance of MLNFeature.
override
implement({required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → MLNFeature: Builds an object that implements the MLNFeature protocol. To implement multiple protocols, use addToBuilder or objc.ObjCProtocolBuilder directly.
override
implementAsBlocking({required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → MLNFeature: Builds an object that implements the MLNFeature protocol. To implement multiple protocols, use addToBuilder or objc.ObjCProtocolBuilder directly. All methods that can be implemented as blocking listeners will be.
implementAsListener({required ObjCObjectBase? identifier(), required void setIdentifier_(ObjCObjectBase?), required NSDictionary attributes(), required void setAttributes_(NSDictionary), required ObjCObjectBase? attributeForKey_(NSString), required NSDictionary geoJSONDictionary(), required CLLocationCoordinate2D coordinate(), NSString? title()?, NSString? subtitle()?, bool $keepIsolateAlive = true}) → MLNFeature: Builds an object that implements the MLNFeature protocol. To implement multiple protocols, use addToBuilder or objc.ObjCProtocolBuilder directly. All methods that can be implemented as listeners will be.