How to clustered markers from Firebase in GoogleMaps for iOS

Question

I\'m developing an app on which I want to show a lot of events on the map. The user can click on an event and see a lot of informations about it. In another view, a user can

Answer 1

Firstly loadMarker() should be called after the clusterManager is initialized i.e

clusterManager = GMUClusterManager(map: maMap, algorithm: algorithm, renderer: renderer)

then

clusterManager.cluster()
clusterManager.setDelegate(self, mapDelegate: self)

should be placed in loadMarker() after for loop ends.

Your viewcontroller should conform to this protocol GMUClusterManagerDelegate then add these 2 methods in viewcontroller.

func renderer(_ renderer: GMUClusterRenderer, markerFor object: Any) -> GMSMarker? {

    let marker = GMSMarker()
    if let model = object as? MarkerModel {
         // set image view for gmsmarker
    }

    return marker
}

func clusterManager(_ clusterManager: GMUClusterManager, didTap cluster: GMUCluster) -> Bool {
    let newCamera = GMSCameraPosition.camera(withTarget: cluster.position, zoom: mapView.camera.zoom + 1)
    let update = GMSCameraUpdate.setCamera(newCamera)
    mapView.moveCamera(update)
    return false
}

Try this and let me know if this works else we will try something else.