Google Maps zoom out to GPS and markers

Showing All Markers with screen bound:

Here I am trying to provide you one simple example, hope this will help you.Using this, you can show any number of markers on screen.

Example:

let path = GMSMutablePath()for var i in 0 ..< array.count //Here take your "array" which contains lat and long.{    let marker = GMSMarker()    let lat = Double(array.objectAtIndex(i).valueForKey(lattitude) as! String)    let long = Double(arrayr.objectAtIndex(i).valueForKey(longitude) as! String)          marker.position = CLLocationCoordinate2DMake(lat!,long!)    path.addCoordinate(marker.position)    marker.map = self.mapView}let bounds = GMSCoordinateBounds(path: path)self.mapView!.animateWithCameraUpdate(GMSCameraUpdate.fitBounds(bounds, withPadding: 30.0))

Can you try the below code, this is converted from ObjC code here is the documentation of includingCoordinate

let bounds = GMSCoordinateBounds()bounds.includingCoordinate(self.startMarker.position)bounds.includingCoordinate(self.endMarker.position)bounds.includingCoordinate(yourCurrentLocationPosition)self.mapView.animateWithCameraUpdate(GMSCameraUpdate(fitBounds:bounds, padding:20.0f))

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {    showMarkers(locations)    //stop updating location when you find suitable}func showMarkers(userLocation: [CLLocation]){    let location1: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: self.startLatitude, longitude: self.startLongitude)    let location2: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: self.endLatitude, longitude: self.endLongitude)    let location3: CLLocationCoordinate2D = userLocation[0].coordinate    var locationArray = []    locationArray.append(location1)    locationArray.append(location2)    locationArray.append(location3)    var bounds = GMSCoordinateBounds()    for location in locationArray    {        let latitude = location.valueForKey("latitude")        let longitude = location.valueForKey("longitude")        let marker = GMSMarker()        marker.position = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)        marker.map = self.mapView        bounds = bounds.includingCoordinate(marker.position)    }    let update = GMSCameraUpdate.fitBounds(bounds, withPadding: 100)    mapView.animateWithCameraUpdate(update)}

Note:

locationArray contains three locations ie. Marker 1, Marker 2, user location.