How to detect zoom's effect on the map in Swift - swift

Question

I am using regionDidChangeAnimated for my mapView. I want to detect when user zoom's or drag's a map. Drag is being detected, but I can't seem to detect when user zoom's the map. I tried to use:
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
print("region will change")
}
But when I zoom my map it does not work.
Full code:
var locationManager: CLLocationManager = CLLocationManager()
var startLocation: CLLocation!
#IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
//get current location
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
self.mapView.showsUserLocation = true
startLocation = nil
let mapDragRecognizer = UIPanGestureRecognizer(target: self, action: "didDragMap:")
mapDragRecognizer.delegate = self
self.mapView.addGestureRecognizer(mapDragRecognizer)
self.mapView.pitchEnabled = true
self.mapView.showsBuildings = true
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [CLLocation]) {
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05))
mapView.setRegion(region, animated: false)
let currentLocX = String(format: "%.4f", location!.coordinate.latitude)
let currentLocY = String(format: "%.4f", location!.coordinate.longitude)
self.locationManager.stopUpdatingLocation()
}
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
print("Errors: " + error.localizedDescription)
}
func didDragMap(gestureRecognizer: UIGestureRecognizer) {
print("Drag")
}
func mapView(mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
print("Zoom")
}

Answer 1

I have solved it. In the override func viewDidLoad() need to add self.mapView.delegate = self
And add functions for determine zoom's on the map:
private var mapChangedFromUserInteraction = false
private func mapViewRegionDidChangeFromUserInteraction() -> Bool {
let view = self.mapView.subviews[0]
if let gestureRecognizers = view.gestureRecognizers {
for recognizer in gestureRecognizers {
if( recognizer.state == UIGestureRecognizer.State.began || recognizer.state == UIGestureRecognizer.State.ended )) {
return true
}
}
}
return false
}
func mapView(_ mapView: MKMapView, regionWillChangeAnimated animated: Bool) {
mapChangedFromUserInteraction = mapViewRegionDidChangeFromUserInteraction()
}
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
if (mapChangedFromUserInteraction) {
print("ZOOM finished")
}
}