GMSOverlay zIndex issue on tap: Swift iOS Google Maps SDK - ios

Question

I have been trying to implement GMSOverlay on map with overlapping overlays. Setting zIndex did work on displaying overlays on top of each other. But when tapping on top overlay, it is not working as it should. The one behind is overtaking tap.
Can someone help me debug and fix this issue:
Here is the code snippet of overlay implementation:
Overlay Custom class
class OrbisMapOverlayMarker: GMSGroundOverlay {
var mapPlaceBaseColor: UIColor!
var mapPlaceId: String!
var placeCoordinate: CLLocationCoordinate2D!
var lastCheckinTimeStamp: Date!
var radius: CLLocationDistance!
var fixedRadius: CLLocationDistance!
var imageView: UIImageView!
private var pulseMaxSize: CLLocationDistance = 100
var increment: CLLocationDistance = 10
private let maxSizeReference: CLLocationDistance = 100
private let referenceRadius: CLLocationDistance = 500
var fixedOpacity: Float = 1
var isProgressing = true
var imageUrlName: String = ""
init(bounds: GMSCoordinateBounds, icon: UIImage?, radius: CLLocationDistance) {
super.init()
self.imageView = UIImageView()
self.bounds = bounds
self.icon = icon
self.radius = radius
self.fixedRadius = radius
pulseMaxSize = (maxSizeReference / referenceRadius) * radius
increment = (maxSizeReference * 0.1 / referenceRadius) * radius
}
}
Implementation:
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let placeSize = orbisPlace.calculatedSize
let clDistance = CLLocationDistance(placeSize)
let coordinate = CLLocationCoordinate2D(latitude: orbisPlace.coordinates?.latitude ?? 0, longitude: orbisPlace.coordinates?.longitude ?? 0)
let topLeftCoordinate = CLHelper.coordinate(from: coordinate, distance: -clDistance)
let bottomRightCoordinate = CLHelper.coordinate(from: coordinate, distance: clDistance)
let circleZIndex = Int32(1600 - placeSize)
var color = UIColor(named: AppColors.appBlue.rawValue)
if let colorHex = orbisPlace.placeDominantGroup?.strokeColorHexString {
color = UIColor.hexStringToUIColor(hex: colorHex)
}
let customMarker = OrbisMapOverlayMarker(bounds: GMSCoordinateBounds(coordinate: topLeftCoordinate, coordinate: bottomRightCoordinate), icon: nil, radius: clDistance)
let mapZoomRadius = mapView.getRadius()
customMarker.mapPlaceId = orbisPlace.placeKey
customMarker.position = CLLocationCoordinate2D(latitude: orbisPlace.coordinates?.latitude ?? 0, longitude: orbisPlace.coordinates?.longitude ?? 0)
let placeOpacity = Float(getPlaceCircleOpacity(forCircle: customMarker, withSize: placeSize, mapRadius: mapZoomRadius))
if let activeMarker = self.activeGlowOverlay {
if activeMarker.mapPlaceId == orbisPlace.placeKey {
customMarker.opacity = 1
customMarker.fixedOpacity = Float(1)
}
else {
customMarker.opacity = 0.1
customMarker.fixedOpacity = Float(0.1)
}
}
else {
customMarker.opacity = placeOpacity
customMarker.fixedOpacity = Float(placeOpacity)
}
customMarker.isTappable = true
mapMarkers.append(customMarker)
customMarker.icon = image
customMarker.zIndex = circleZIndex
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1, qos: .userInteractive, flags: .enforceQoS) {
customMarker.map = mapView
}
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I have also submitted issue on map sdk repo:
https://github.com/googlemaps/maps-sdk-for-ios-samples/issues/118