UISearchController with Google Maps using Swift - ios

Question

I'm trying to create a screen where there is going to be a Google map covering the whole screen and a button on the top showing the selected address (where the marker is pointing).
And I want when the user clicks on that button to be presented with a UISearchBar where he can search for locations using the Google Places API.
I have been following the following tutorial:
https://www.youtube.com/watch?v=gRQUoHleCGM
Unfortunately, in my case the search bar is not appearing (although the background is dimmed when I press the button).
Here are some screenshots from before I press the button and after.
And this is the code of my view controller.
class ChooseLocationViewController: UIViewController, GMSMapViewDelegate, UISearchBarDelegate, UISearchControllerDelegate {
let geocoder = GMSGeocoder()
var mapView: GMSMapView = GMSMapView.mapWithFrame(CGRectZero, camera:GMSCameraPosition.cameraWithLatitude(51.515339, longitude: -0.141838, zoom: 16))
var addressButton: UIButton = UIButton()
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
let marker = UIImageView(frame: CGRect(x: 20, y: 20, width: 50, height: 50))
marker.image = UIImage(named: "default-marker")
marker.center.x = self.view.center.x
marker.center.y = self.view.center.y - (self.navigationController?.navigationBar.frame.size.height)!
addressButton = UIButton(frame: CGRect(x: 20, y: 20, width: self.view.frame.size.width - 25, height: 47))
addressButton.center.x = self.view.center.x
addressButton.backgroundColor = UIColor(red: 248/255, green: 248/255, blue: 248/255, alpha: 1.0)
addressButton.layer.borderColor = UIColor(red: 178/255, green: 178/255, blue: 178/255, alpha: 1.0).CGColor
addressButton.layer.borderWidth = 1.0
addressButton.layer.cornerRadius = 5
addressButton.setTitleColor(UIColor(red: 68/255, green: 68/255, blue: 68/255, alpha: 1.0), forState: .Normal)
addressButton.titleLabel?.font = UIFont.systemFontOfSize(13)
addressButton.addTarget(self, action: "showLocationSearch", forControlEvents: .TouchDown)
self.view = mapView
self.view.addSubview(marker)
self.view.addSubview(addressButton)
}
func showLocationSearch() {
let searchController = UISearchController(searchResultsController: nil)
searchController.delegate = self
searchController.searchBar.delegate = self
self.presentViewController(searchController, animated: true, completion: nil)
}
func willPresentSearchController(searchController: UISearchController) {
self.navigationController?.extendedLayoutIncludesOpaqueBars = true
}
func willDismissSearchController(searchController: UISearchController) {
self.navigationController?.extendedLayoutIncludesOpaqueBars = false
}
func mapView(mapView: GMSMapView, idleAtCameraPosition position: GMSCameraPosition) {
let coordinate = position.target
geocoder.reverseGeocodeCoordinate(coordinate) { response, error in
if let address = response?.firstResult() {
if let lines = address.lines {
if (lines.count > 0) {
self.addressButton.setTitle(lines[0], forState: .Normal)
}
}
}
}
}
}
Also, the reason I'm changing the extendedLayoutIncludesOpaqueBars is because I noticed that in other views where I have a search bar, this is necessary for it to be presented properly. In this case, I get exactly the same behavior (search bar is not showing) whether I do that or not.
What am I doing wrong? Did anyone have a similar issue?