How to Cluster Custom Icons Markers in Googlemaps for iOS

How to cluster custom icons markers in GoogleMaps for iOS

You are actually clustering first then adding markers thats why this is happening.

What you should actually do is

class MarkerModel: NSObject, GMUClusterItem {
var position: CLLocationCoordinate2D
var name: String

init(position: CLLocationCoordinate2D, name: String) {
    self.position = position
    self.name = name
}
}

override func viewDidLoad() {
super.viewDidLoad()

mapView = GMSMapView(frame: view.frame)
mapView.camera = GMSCameraPosition.camera(withLatitude: 13.756331, longitude: 100.501765, zoom: 12.0)
mapView.mapType = .normal
mapView.delegate = self
view.addSubview(mapView)

if isClustering {
    var iconGenerator: GMUDefaultClusterIconGenerator!
    if isCustom { // Here's my image if the event are clustered
        var images: [UIImage] = [UIImage(named: "m1.png")!, UIImage(named: "m2.png")!, UIImage(named: "m3.png")!, UIImage(named: "m4.png")!, UIImage(named: "m5.png")!]
        iconGenerator = GMUDefaultClusterIconGenerator(buckets: [5, 10, 15, 20, 25], backgroundImages: images)
    } else {
        iconGenerator = GMUDefaultClusterIconGenerator()
    }

    let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm()
    let renderer = GMUDefaultClusterRenderer(mapView: mapView, clusterIconGenerator: iconGenerator)

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

} else {
}
}

func addMarkers(cameraLatitude : Float, cameraLongitude : Float) {
    let extent = 0.01
    for index in 1...clusterItemCount {
        let lat = cameraLatitude + extent * randomScale()
        let lng = cameraLongitude + extent * randomScale()
        let name = "Item \(index)"

        let position = CLLocationCoordinate2DMake(lat, lng)

        let item = MarkerModel(position: position, name: name)
        item.icon = #imageLiteral(resourceName: "marker")
        clusterManager.add(item)
    }
     clusterManager.cluster()
        clusterManager.setDelegate(self, mapDelegate: self)
}

func randomScale() -> Double {
    return Double(arc4random()) / Double(UINT32_MAX) * 2.0 - 1.0
}

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
}

How to make marker clustering with custom markers in GoogleMaps for iOS?

You can check the following topic :
How to cluster custom icons markers in GoogleMaps for iOS
How to clustered markers from Firebase in GoogleMaps for iOS

You could find a good answer because I had the same issue last week, just follow these advices.
Hope it helps you a lot

Customize the marker on google map with clusters

After creating your GMUDefaultClusterRenderer set its delegate I used the view controller I was working in, and then implement the GMUClusterRendererDelegate

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

After that you implement the func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) from the protocol. This method gives you access to the marker and the data enclosed in the marker.
Use an If let statement to access the data and give the marker the iconView you want if let markerData = marker.userData

How to customize default pin marker using Google Cluster Manager?

marker has a property iconView which is a UIView. Since it's a UIView you can customize however you want.

func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
    marker.iconView = MyView()
}

how can I set custom marker icon with markers cluster in iOS Swift

1 : GO to Poitem class

Add one more element to that class

 let marker = GMSMarker()

add that in init method too

and then simple called

 let myitem = POitem() 
 myitem.marker = GMSMarker(latitude:0,longitude:0)
 self.map.add(myitem)  

google maps iOS SDK: custom icons to be used as markers

Here is what I have done

let marker = GMSMarker()

// I have taken a pin image which is a custom image
let markerImage = UIImage(named: "mapMarker")!.withRenderingMode(.alwaysTemplate)

//creating a marker view
let markerView = UIImageView(image: markerImage)

//changing the tint color of the image
markerView.tintColor = UIColor.red

marker.position = CLLocationCoordinate2D(latitude: 28.7041, longitude: 77.1025)

marker.iconView = markerView
marker.title = "New Delhi"
marker.snippet = "India"
marker.map = mapView

//comment this line if you don't wish to put a callout bubble
mapView.selectedMarker = marker

The output is

And my marker image was

You can change your color as per your need. Also if you want something in rectange, you can just create a simple small rectangular image and use it like I did above and change the color of your need.

Or if you want a rectangle with text within it, you can just create a small UIView with some label and then convert that UIView in UIImage and can do the same thing.

//function to convert the given UIView into a UIImage
func imageWithView(view:UIView) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
    view.layer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}

Hope it helps!!

How to clustered markers from Firebase in GoogleMaps for iOS

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.

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