How to Show Cluster for Mkpolyline with Geojson Data View in iOS Swift

Mapbox iOS clustering works, but circle style layer and numbers layer aren't appearing/reflecting the marker density of the cluster

So, I feel like an idiot.

The issue was in the MGLShapeSource:

MGLShapeSource(identifier: "clusteredPoints", shape: shapes, options: [.clustered: true, .clusterRadius: 0.5])

For whatever reason, I had been messing around with the clusterRadius, and had it set to 0.5, which I assume is in points. Note that the example was using the marker's width to determine the cluster radius.

let source = MGLShapeSource(identifier: "clusteredPorts",
url: url,
options: [.clustered: true, .clusterRadius: icon.size.width])

I though that, because some of the markers were disappearing whenever they overlapped with another marker, that they were clustering but the cluster layer was not being shown. They weren't clustering, I guess shape sources are just able to know when they are overlapping with another, and will disappear accordingly. Just because they disappear doesn't meant that they are clustered.

Clustering annotations with Mapbox

I did some research on this not too long ago and it didn't seem to be possible on iOS. Here is the suggestion on github that is still open. Here is another issue about how it wasn't mentioned in the documentation but has since been added.

How can i parse a custom marker icon with clustering in iOS Swift

Solution found:Here starts the class in GMUDefaultClusterRenderer.m at clustering folder

 - (GMSMarker *)markerWithPosition:(CLLocationCoordinate2D)position
                         from:(CLLocationCoordinate2D)from
                     userData:(id)userData
                  clusterIcon:(UIImage *)clusterIcon
                     animated:(BOOL)animated {.....

......

I replace the original with this:

  if (clusterIcon != nil) {
marker.icon = clusterIcon;
marker.groundAnchor = CGPointMake(0.5, 0.5);
}else{
marker.icon = [UIImage imageNamed:@"K_Annotation.png"];
}

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