drop pin with long touch in google maps

Question

i can't add marker with long touch in google maps in swift i have try lots of codes but it doesn't work for me what should i do !?

override func viewDidLoad() {

    super.viewDidLoad()        
    GMSServices.provideAPIKey("AIzaSyBw95wEhcSiSBmPWuYkiK0_IBnZQK-Lm7I")


    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
}

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    print("Error" + error.description)
}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let userLocation = locations.last
    let center = CLLocationCoordinate2D(latitude: userLocation!.coordinate.latitude, longitude: userLocation!.coordinate.longitude)

    let camera = GMSCameraPosition.cameraWithLatitude(userLocation!.coordinate.latitude,
                                                      longitude: userLocation!.coordinate.longitude, zoom: 16)
    let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)
    mapView.myLocationEnabled = true
    mapView.settings.myLocationButton = true
    view = mapView

   let  position = CLLocationCoordinate2DMake(10, 10)
    let marker = GMSMarker(position: position)


    marker.opacity = 0.6
    marker.position = center
    marker.title = "Current Location"
    marker.snippet = ""
    marker.map = mapView
    //mapView.clear()
}

Ant help would be appreciate

you want to drag existing marker or want to add a new marker on map? — Nirav D, Jun 11 '16 at 07:03
You want to add marker on long press not on single tap on mapview. — Nirav D, Jun 11 '16 at 07:27

score 2 · Answer 1 · edited Aug 30 '19 at 15:02

2

Have you try this. First you need to add long gesture on mapView like this

For Objective C

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
[self.mapView addGestureRecognizer:self.longPress];

Now add this handleLongPress function

- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer
{
    if (recognizer.state == UIGestureRecognizerStateBegan)
    {
        CGPoint longPressPoint = [recognizer locationInView:self.mapView];
        CLLocationCoordinate2D coordinate = [mapView.projection coordinateForPoint: point];
        //Now you have Coordinate of map add marker on that location
     }
}

For swift

let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: Selector(("handleLongPress:")))
self.mapView.addGestureRecognizer(longPressRecognizer)

Now add this handleLongPress function

@objc func handleLongPress(recognizer: UILongPressGestureRecognizer)
 {
    if (recognizer.state == UIGestureRecognizerState.began)
    {
        let longPressPoint = recognizer.location(in: self.mapView);
        let coordinate = mapView.projection.coordinate(for: longPressPoint )
        //Now you have Coordinate of map add marker on that location
        let marker = GMSMarker(position: coordinate)
        marker.opacity = 0.6
        marker.title = "Current Location"
        marker.snippet = ""
        marker.map = mapView
    }
}

Hope this will help you

edited Aug 30 '19 at 15:02

Jeff

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answered Jun 11 '16 at 07:39

Nirav D

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i have to change it to swift first ! – P.Tb Jun 11 '16 at 07:45
Sry i didn't notic you want the code in swift. Let me edit my answer in swift – Nirav D Jun 11 '16 at 07:47
No method declared with Objective-C selector 'handleLongPress:' – P.Tb Jun 11 '16 at 08:27
Is it run time or compile time? – Nirav D Jun 11 '16 at 08:29
Check my answer in this page ! – P.Tb Jun 11 '16 at 08:37
You are doing this wrong way. you need to add gestures 2 lines in viewdidload. And then create a function of that method not inside any other function. Have you got it? – Nirav D Jun 11 '16 at 08:43
let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: "handleLongPress:") self.mapView.addGestureRecognizer(longPressRecognizer) – Nirav D Jun 11 '16 at 08:58
add this two line in viewDidLoad() method. and create that function inside your viewController not inside any other function. – Nirav D Jun 11 '16 at 08:59
fatal error: unexpectedly found nil while unwrapping an Optional value – P.Tb Jun 11 '16 at 09:41
Where you getting that error? On coordinate. Try to print coordinate before use it. – Nirav D Jun 11 '16 at 09:49
Have you try to print the value of coordinate after you get from mapView method. – Nirav D Jun 11 '16 at 10:02
print(coordinate) like that. Can you show me the screen shot of your code? – Nirav D Jun 11 '16 at 10:03
http://stackoverflow.com/questions/37762422/fatal-error-unexpectedly-found-nil-while-unwrapping-an-optional-value-lldb – P.Tb Jun 11 '16 at 10:06
Why you have added gesture in location method i told you put that line in viewDidLoad() – Nirav D Jun 11 '16 at 10:09
check that page again – P.Tb Jun 11 '16 at 10:17
self.View.addGestureRecognizer(longPressRecognizer) – P.Tb Jun 11 '16 at 10:41
Have you write the code of add marker inside that gesture method? – Nirav D Jun 11 '16 at 10:48
Getting crash in this line : CLLocationCoordinate2D coordinate = [mapView.projection coordinateForPoint: longPressPoint]; – Mihir Oza Mar 13 '17 at 10:53
-[MKMapView projection]: unrecognized selector sent to instance 0x7f8ac140b850 2017-03-13 16:19:26.239 geofences[2914:155187] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MKMapView projection]: unrecognized selector sent to instance 0x7f8ac140b850' – Mihir Oza Mar 13 '17 at 10:53
@MihirOza This answer is for google map not for the Apple Mapkit. – Nirav D Mar 14 '17 at 04:21
I used google map but in crash log it showing like that. Anyway thanks I got my answer. – Mihir Oza Mar 14 '17 at 10:14

score 0 · Answer 2 · answered Dec 16 '20 at 07:39

It's not a big deal for now by google map provide an override function with a long press. Here is an example code:

func mapView(_ mapView: GMSMapView, didLongPressAt coordinate: CLLocationCoordinate2D) {
    let marker = GMSMarker(position: coordinate)
   marker.icon = UIImage(named: "ic_pin_marker") // custom your own marker
   marker.map = mapView
}

drop pin with long touch in google maps

2 Answers2