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

The Android API has a very convenient class for this, IconGenerator. Using the IconGenerator in my Android app, I can easily make a marker that:

1. is a simple rectangle with the color of my choosing.
2. resizes to hold text of any length.
3. is NOT an info window - I'd like the marker itself to contain the text as shown in the image below from the android version.

// Android - problem solved with IconGenerator
IconGenerator iconGenerator = new IconGenerator(context);
iconGenerator.setStyle(IconGenerator.STYLE_GREEN); // or any other color
Bitmap iconBitmap = iconGenerator.makeIcon(myString);
Marker m = new MarkerOptions().icon(BitmapDescriptorFactory.fromBitmap(iconBitmap))
                              .position(myLatLng);
map.addMarker(m); // map is a com.google.android.gms.maps.GoogleMap

Is there a way to do something as simple as this in iOS using Swift? There has been a recent release of the iOS api that allows "marker customization", but I don't see how to apply it to this use case.

// iOS (Swift) - I don't know how to create the icon as in code above
let marker = GMSMarker(position: myLatLng)
marker.icon = // How can I set to a rectangle with color/text of my choosing?
marker.map = map // map is a GMSMapView

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!!