问题

I have load multiple pins in GoogleMap with clustering and below is my code.

Link : https://github.com/googlemaps/google-maps-ios-utils/issues/235

func initializeClusterItems() {
    let iconGenerator = GMUDefaultClusterIconGenerator()
    let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm()
    let renderer = GMUDefaultClusterRenderer(mapView: mapView, clusterIconGenerator: iconGenerator)
    renderer.delegate = self
    clusterManager = GMUClusterManager(map: mapView, algorithm: algorithm, renderer: renderer)
}

func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
    marker.groundAnchor = CGPoint(x: 0.1, y: 0.45)
    if let markerData = (marker.userData as? POIItem) {
        let infoWindow = Bundle.main.loadNibNamed("InitialMapInfoView", owner: self, options: nil)?.first as! InitialMapInfoView
        infoWindow.imgUser.sd_setImage(with: URL(string: markerData.friend.user_details.user_photo_small), placeholderImage: #imageLiteral(resourceName: "User_profile"), options: .highPriority, completed: nil)

        if let objCurrentMarker = SharedData.sharedInstance.allFriends.first(where: {$0.user_details.user_id == markerData.friend.user_details.user_id}) {
            print("Latitude: \(markerData.position.latitude)")
            print("Longitude: \(markerData.position.longitude)")

            print(objCurrentMarker.user_details.screen_name)

            print("Update Latitude: \(objCurrentMarker.user_details.latitude)")
            print("Update Longitude: \(objCurrentMarker.user_details.longitude)")

            markerData.position = CLLocationCoordinate2D.init(latitude: objCurrentMarker.user_details.latitude, longitude: objCurrentMarker.user_details.longitude)
            markerData.friend.user_details.isUserOnline = objCurrentMarker.user_details.isUserOnline
        }

        if !markerData.friend.user_details.isUserOnline {
            infoWindow.imgCar.image = UIImage.init(named: "small_inactive_" + markerData.friend.user_details.car_personality_name)
        }
        else {
            infoWindow.imgCar.image = UIImage.init(named: "small_" + markerData.friend.user_details.car_personality_name)
        }

        infoWindow.lblName.text = markerData.friend.user_details.name
        infoWindow.btnImgVW.tag = markerData.userIndex
        infoWindow.btnImgVW.addTarget(self, action: #selector(btnUserTapped(_:)), for: .touchUpInside)
        marker.accessibilityHint = String(markerData.userIndex)
        marker.iconView = infoWindow
        marker.tracksViewChanges = false
    }
}

func setMarkers() {
    arrMarkers.removeAll()
    for i in 0..<SharedData.sharedInstance.allFriends.count {
        let marker = MyMarker()
        let friend = SharedData.sharedInstance.allFriends[i]
        marker.id = friend.user_details.user_id
        marker.position = CLLocationCoordinate2D.init(latitude: friend.user_details.latitude , longitude: friend.user_details.longitude)
        marker.accessibilityHint = String(i)

        marker.icon = #imageLiteral(resourceName: "trans")
        marker.tracksViewChanges = true
        marker.map = mapView

        arrMarkers.append(marker)
        self.generatePOIItems(String(format: "%d", i), position: marker.position, icon: nil, friend: friend, userIndex: i)
    }
    clusterManager.cluster()
    clusterManager.setDelegate(self, mapDelegate: self)
}

func updateMarkers() {
    clusterManager.cluster()
}

func generatePOIItems(_ accessibilityLabel: String, position: CLLocationCoordinate2D, icon: UIImage?, friend: WallBeeppClass, userIndex: Int) {
    let name = "Item \(accessibilityLabel)"
    let item = POIItem(position: CLLocationCoordinate2DMake(position.latitude, position.longitude), name: name, friend: friend, userIndex: userIndex)
    clusterManager.add(item)
}

class POIItem: NSObject, GMUClusterItem {
    var position: CLLocationCoordinate2D
    var name: String!
    var friend: WallBeeppClass!
    var userIndex: Int!

    init(position: CLLocationCoordinate2D, name: String, friend: WallBeeppClass, userIndex: Int) {
        self.position = position
        self.name = name
        self.friend = friend
        self.userIndex = userIndex
    }
}

I want to update the users latitude & longitude inside clusterManagerItems.

I tried the below line to change location data inside func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker){} but app crashing with this error

'All items should be mapped to a distance'

markerData.position = CLLocationCoordinate2D.init(latitude: objCurrentMarker.user_details.latitude, longitude: objCurrentMarker.user_details.longitude)

If I add below line then it works but when I zoomIn/ZoomOut the map. clusterManager item load at old position and then it load to new position.

marker.position = CLLocationCoordinate2D.init(latitude: objCurrentMarker.user_details.latitude, longitude: objCurrentMarker.user_details.longitude)

A you can see, I printed markerData.friend.user_details.latitude details which contains old coordinats of user and I also printed user's latest data objCurrentMarker.user_details.latitude which contains the latest coordinates.

EDIT1

I'm able to update the already added GMUClusterItem but the issue is that when i call clusterManager.cluster() again when I receive new data from server then GMUClusterItem is gone when I zoomin the map and come again on map when zoomout the Map.

EDIT 2

Reference Video Link

https://gofile.io/?c=8z0vE5

EDIT 3

Custom Marker disappear because of the below code. when I comment below code then marker wasn't disappear from map.

CATransaction.begin()
CATransaction.setAnimationDuration(1.0)
marker.position = CLLocationCoordinate2D.init(latitude: objCurrentMarker.user_details.latitude, longitude: objCurrentMarker.user_details.longitude)
CATransaction.commit()

Please guide me how to update already added Clustermanager item?

Thanks in advance