Multiple GMSMarker show/hide consumes time

Question

I have about 4000 markers on the GoogleMap and I am not using clustering. So, at the moment what I do to show/ hide markers on map is below.

marker.map = nil 
marker.map = mapView

There are some cases where I need to filter out some markers and make them visible else should be hidden. So I can achieve it with about code but with a cost to time.

markers.forEach { (marker) in
                if !arrDeviceID.contains(marker.deviceID ?? "") {
                        marker.map = nil
                } else {
                        marker.map = self.googleMapView
                }
            }

Same thing in Android there is a property Visibility which is working perfect and fast. But in iOS there is no such property.

So what can I do to improve performance.

Answer 1

lets say this is your markers array

var markers = [GMSMarker]()

prepare dictionary of markers, lets assume your device id is in Int

func prepareMarkersDict(markers:[GMSMarker]) -> [Int:GMSMarker]{
    var markerDict = [Int:GMSMarker]()
    for marker in markers{
        markerDict[marker. deviceID] = marker
    }
    return markerDict
}

your array of device id which you wants to hide

var arrDeviceIDToHide = [Int]()

now iterate it and hide the marker

let markerDict = prepareMarkersDict(markers:markers)
for deviceId in arrDeviceIDToHide{
   let marker = markerDict[deviceId]
   marker?.map = nil
}