Example Google map ViewController

GoogleMapViewController.swift

//
//  GoogleMapViewController.swift
//
//  Created by Vasiliy Savchuk on 11/21/16.
//  Copyright © 2016 All rights reserved.
//

import UIKit
import GoogleMaps

class GoogleMapViewController: UIViewController {

    var mapView : GMSMapView?
    var locationManager = CLLocationManager()
    
    //MARK - Lifecicle Object

    override func viewDidLoad() {
        super.viewDidLoad()
        self.createMap()
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
    }
    
    //MARK: Methods
    
    func createMap() {
        self.mapView = GMSMapView.init(frame: CGRect.zero)
        self.view = self.mapView
        self.mapView?.settings.myLocationButton = true  
    }
}

//MARK: CLLocationManagerDelegate

extension GoogleMapViewController: CLLocationManagerDelegate {
    
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            locationManager.startUpdatingLocation()
            mapView?.isMyLocationEnabled = true
            mapView?.settings.myLocationButton = true
        }
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            mapView?.camera = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)
            locationManager.stopUpdatingLocation()
        }
    }
}