clusteringIdentifier
An identifier that determines whether the annotation view participates in clustering.
Declaration
var clusteringIdentifier: String? { get set }Discussion
The default value of this property is nil, which prevents MapKit from clustering the annotation view with other annotation views. Setting the property to a non-nil value enables it to participate in clustering.
Clustering occurs when there’s a collision between multiple annotation views with the same identifier on the map surface. MapKit removes the annotation views involved in the collision from the map view and replaces them with a clustering annotation view, which displays the title from one of the annotations and provides access to the other annotations.