Google Maps GMSMapView on custom UIView

If you want to add a mapView after the loading of the view, then you need to create an object of GMSMapView. So break the outlets of your mapView since it will be created dynamically.

import UIKit
import GoogleMaps

class MapViewController: UIViewController {

    //Take a Google Map Object. Don't make outlet from Storyboard, Break the outlet of GMSMapView if you made an outlet
    var mapView:GMSMapView?

    override func viewDidLoad() {

        super.viewDidLoad()

        mapView = GMSMapView.map(withFrame: CGRect(x: 100, y: 100, width: 200, height: 200), camera: GMSCameraPosition.camera(withLatitude: 51.050657, longitude: 10.649514, zoom: 5.5))

        //so the mapView is of width 200, height 200 and its center is same as center of the self.view
        mapView?.center = self.view.center

        self.view.addSubview(mapView!)

    }
}

Here is the output. mapView is of width = 200 and height = 200 with center as same as self.view

I finally figured out how to display the map in a UIView created in Storyboard and center it in a specific location.

Note: After created the UIView outlet, I changed its class to GMSMapView as explained before.

import UIKit
import GoogleMaps

class ViewController: UIViewController {

    @IBOutlet weak var searchBar: UISearchBar!
    @IBOutlet weak var toolBar: UIToolbar!
    @IBOutlet weak var mapView: GMSMapView!

    override func viewDidLoad() {

        super.viewDidLoad()

        let camera = GMSCameraPosition.camera(withLatitude: 52.520736, longitude: 13.409423, zoom: 12)
        self.mapView.camera = camera

        let initialLocation = CLLocationCoordinate2DMake(52.520736, 13.409423)
        let marker = GMSMarker(position: initialLocation)
        marker.title = "Berlin"
        marker.map = mapView

    }

And this is the output: Map centred in Berlin