How to display sub view or button on top of Google maps Xcode

Question

I was trying to add a button on top of Google maps. i tried everything i could but no help can anyone help me.. in Xcode preview it shows on top but after running the app it come below google map.

Picture after running app

How it looks in XCODE

CODE OF MAP

import UIKit
import GoogleMaps

class HomeViewController: UIViewController, CLLocationManagerDelegate {
    @IBOutlet weak var scrollView: UIScrollView!
    @IBAction func refreshLocation(sender: AnyObject) {
        locationManager.startUpdatingLocation()

    }
@IBOutlet weak var gMapView: GMSMapView!


let locationManager = CLLocationManager()




override func viewDidLoad() {
    super.viewDidLoad()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
    locationManager.requestAlwaysAuthorization()
  locationManager.startUpdatingLocation()
    self.scrollView.contentSize=CGSizeMake(320, 700)


            let camera = GMSCameraPosition.cameraWithLatitude(15.4989, longitude: 73.8278, zoom: 17)

            gMapView.camera = camera
            gMapView.myLocationEnabled = true

            self.view.addSubview(gMapView)
            let marker = GMSMarker()

            marker.map = self.gMapView

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

}

extension HomeViewController {
    func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        if status == CLAuthorizationStatus.AuthorizedAlways {
            locationManager.startUpdatingLocation()

        gMapView.myLocationEnabled = true

        gMapView.settings.myLocationButton = true
    }
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let location = locations.first {
        gMapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 15, bearing: 0, viewingAngle: 0)

        locationManager.stopUpdatingLocation()

    }
}



}

Answer 1

I found the answer

self.view.bringSubviewToFront(self.view_name)

You need to call bringSubviewToFront on the parent view.