How do I move marker along with moving of Google Map in iOS?

Question

I am displaying a marker in a particular place, along with displaying the current address in the address label on Google Maps.

Now, I want to change the location by moving the Google Map, but the problem is that when I am moving the map, I should simultaneously move the marker along with the map, and I should display the address of that location in the address label.

How can I do that?

I tried this:

let destinationMarker = GMSMarker(position: self.destinationLocation.coordinate)

let image = UIImage(named:"sourcemarker")
destinationMarker.icon = image
destinationMarker.draggable = true
destinationMarker.map = self.viewMap
//viewMap.selectedMarker = destinationMarker
destinationMarker.title = "hi"
destinationMarker.userData = "changedestination"

func mapView(mapView: GMSMapView, didEndDraggingMarker marker: GMSMarker)
{
    if marker.userData as! String == "changedestination"
    {
        self.destinationLocation = CLLocation(latitude: marker.position.latitude, longitude: marker.position.longitude)
        self.destinationCoordinate = self.destinationLocation.coordinate
        //getAddressFromLatLong(destinationCoordinate)
    }
}

Answer 1

Update for Swift 4:

First you need to conform with the GMSMapViewDelegate:

extension MapsVC: GMSMapViewDelegate{

And then set your VC as the delegate of viewMap in the viewDidLoad()

viewMap.delegate = self

After that you just need to use the following method to get updates from the camera position and set that as the new position for the marker:

func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition) {
    destinationMarker.position = position.target
    print(destinationMarker.position)
}