How to implement GMUClusterRenderer in Swift

Question

I am using Google Maps API for iOS and want to use marker clustering utility. I figured out how to show clustered markers, but I would like to customize markers. Can someone

Answer 1

In Swift 4.2 :

you can use GMUClusterRendererDelegate:

Add this extension to your controller and be sure that your controller is the delegate of GMUClusterRendererDelegate :

willRenderMarker will call each time a marker going to be render (both cluster marker and clusterItemMarker so you can check it by simple if).so you can modify it's icon and etc before showing it to user

extension YourController: GMUClusterRendererDelegate {
    func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
        // if your marker is pointy you can change groundAnchor
        marker.groundAnchor = CGPoint(x: 0.5, y: 1)
        if  let markerData = (marker.userData as? PersonMarker) {
           let icon = markerData.imageURL
           marker.iconView = CustomMarkerView(forUrl: url)
        }
    }
}

And PersonMarker is your marker class that subclass NSObject and GMUClusterItem : (you can use default class of GMUClusterItem but if you need some other properties you can subclass it)

class PersonMarker: NSObject, GMUClusterItem {

  var position: CLLocationCoordinate2D
  var imageURL : String?
  var name: String?
  var userdId: String?
  var lastSeen: String?

  init(position: CLLocationCoordinate2D, url: String?, name: String?, userId: String?, lastSeen: String?) {
      self.position = position
      self.imageURL = url
      self.name = name
      self.userdId = userId
      self.lastSeen = lastSeen
  }

}

You can add PersonMarker to your GMUClusterManager like this :

 let position = CLLocationCoordinate2D(latitude: item.latitude!, longitude: item.longitute!)
 let person = PersonMarker(position: position, url: item.user?.avaterUrl, name: item.user?.name, userId: item.user?.userId, lastSeen: item.lastUpdate)
 clusterManager.add(person)