Adding a pin annotation to a map view on a long press in swift - ios

Question

I'm trying to make an iPhone app which requires users to be able to long press on a place on a map view to drop a pin there. Does anybody know how this is done?
The behaviour is observable in apple maps when you long press on the screen. It will drop a pin and present an annotation saying "dropped pin"

Answer 1

add UILongPressGestureRecognizer to your MapView
var uilgr = UILongPressGestureRecognizer(target: self, action: "addAnnotation:")
uilgr.minimumPressDuration = 2.0
map.add (uilgr)
//IOS 9
map.addGestureRecognizer(uilgr)
Add annotation on Long press detect - func:
func addAnnotation(gestureRecognizer:UIGestureRecognizer){
if gestureRecognizer.state == UIGestureRecognizerState.Began {
var touchPoint = gestureRecognizer.locationInView(map)
var newCoordinates = map.convertPoint(touchPoint, toCoordinateFromView: map)
let annotation = MKPointAnnotation()
annotation.coordinate = newCoordinates
CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: newCoordinates.latitude, longitude: newCoordinates.longitude), completionHandler: {(placemarks, error) -> Void in
if error != nil {
println("Reverse geocoder failed with error" + error.localizedDescription)
return
}
if placemarks.count > 0 {
let pm = placemarks[0] as! CLPlacemark
// not all places have thoroughfare & subThoroughfare so validate those values
annotation.title = pm.thoroughfare + ", " + pm.subThoroughfare
annotation.subtitle = pm.subLocality
self.map.addAnnotation(annotation)
println(pm)
}
else {
annotation.title = "Unknown Place"
self.map.addAnnotation(annotation)
println("Problem with the data received from geocoder")
}
places.append(["name":annotation.title,"latitude":"\(newCoordinates.latitude)","longitude":"\(newCoordinates.longitude)"])
})
}
}
or you can add annotation without any title:
func action(gestureRecognizer:UIGestureRecognizer){
var touchPoint = gestureRecognizer.locationInView(map)
var newCoordinates = map.convertPoint(touchPoint, toCoordinateFromView: map)
let annotation = MKPointAnnotation()
annotation.coordinate = newCoordinates
map.addAnnotation(annotation)
}

Answer 2

1) Instantiate a UILongPressGestureRecognizer and add it to the MKMapView.
2) When the selector gets called after the user has a long press, call the addAnnotation method in MKMapView with the appropriate title and coordinate.
3) Then make sure you conform to the MKMapViewDelegate and implement viewForAnnotation: which will be called right after you add the annotation and return a MKPinAnnotationView

Answer 3

First declare UIGestureRecognizer in viewDidLoad
let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(addWaypoint(longGesture:)))
mapView.addGestureRecognizer(longGesture)
Second add the function for longPress
#objc func addWaypoint(longGesture: UIGestureRecognizer) {
let touchPoint = longGesture.location(in: mapView)
let wayCoords = mapView.convert(touchPoint, toCoordinateFrom: mapView)
let location = CLLocation(latitude: wayCoords.latitude, longitude: wayCoords.longitude)
myWaypoints.append(location)
let wayAnnotation = MKPointAnnotation()
wayAnnotation.coordinate = wayCoords
wayAnnotation.title = "waypoint"
myAnnotations.append(wayAnnotation)
}
I recommend creating the annotations in an array that will serve you later if you want to delete it, like this...
var myAnnotations = [MKPointAnnotation]()
If you have different annotations, you can delete only the annotations you want, for that when you add a new annotation add to the array. To delete only one group of annotations just do the following
for dots in myAnnotations{
mapView.removeAnnotation(dots)
}
To delete all annotations try
mapView.removeAnnotations(mapView.annotations)
Apologies for the translation....

Answer 4

Update Swift3
func action(gestureRecognizer:UIGestureRecognizer){
let touchPoint = gestureRecognizer.location(in: mapView)
let newCoordinates = mapView.convert(touchPoint, toCoordinateFrom: mapView)
let annotation = MKPointAnnotation()
annotation.coordinate = newCoordinates
mapView.addAnnotation(annotation)
}