How can I show my current location in maps in Xcode? - ios

Question

I watched a few lessons on Youtube and now tried to get hands-on experience. I am pursuing a little project which involves a tabbed app where I tried on the first page to create a map with a button showing the current location. Pretty basic actually. But somehow it just doesn’t work and I don’t know what’s the issue. Someone from CodewithChris told me this “I would suggest breaking up your app into smaller components and making sure each one works before going on to the next. Try outputting your location first before plotting it on a map etc so you can localize bugs easier.” I just don’t understand what she means by smaller components. I really appreciate all the help I can get. Below is the code as good as possible. Thanks in advance for your help.
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet var textFieldForAddress: UITextField!
#IBOutlet var getDirectionsButton: UIButton!
#IBOutlet var map: MKMapView!
var locationManger = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationManger.delegate = self
locationManger.desiredAccuracy = kCLLocationAccuracyBest
locationManger.requestAlwaysAuthorization()
locationManger.requestWhenInUseAuthorization()
locationManger.startUpdatingLocation()
map.delegate = self
}
#IBAction func getDirectionsTapped(_ sender: Any) {
getAddress()
}
func getAddress() {
let geoCoder = CLGeocoder()
geoCoder.geocodeAddressString(textFieldForAddress.text!) { (placemarks, error) in
guard let placemarks = placemarks, let location = placemarks.first?.location
else {
print("No Location Found")
return
}
print(location)
self.mapThis(destinationCord: location.coordinate)
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
print(locations)
}
func mapThis(destinationCord : CLLocationCoordinate2D) {
let souceCordinate = (locationManger.location?.coordinate)!
let soucePlaceMark = MKPlacemark(coordinate: souceCordinate)
let destPlaceMark = MKPlacemark(coordinate: destinationCord)
let sourceItem = MKMapItem(placemark: soucePlaceMark)
let destItem = MKMapItem(placemark: destPlaceMark)
let destinationRequest = MKDirections.Request()
destinationRequest.source = sourceItem
destinationRequest.destination = destItem
destinationRequest.transportType = .automobile
destinationRequest.requestsAlternateRoutes = true
let directions = MKDirections(request: destinationRequest)
directions.calculate { (response, error) in
guard let response = response else {
if let error = error {
print("Something is wrong :(")
}
return
}
let route = response.routes[0]
self.map.addOverlay(route.polyline)
self.map.setVisibleMapRect(route.polyline.boundingMapRect, animated: true)
}
}
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let render = MKPolylineRenderer(overlay: overlay as! MKPolyline)
render.strokeColor = .blue
return render
}
}

Answer 1

If you want to show the user location and have the map track it, you need to set two properties on the map view - showsUserLocation and userTrackingMode. In order for the map to have access to the user location you must receive whenInUse authorisation from the user, using CLocationManager.
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
#IBOutlet var textFieldForAddress: UITextField!
#IBOutlet var getDirectionsButton: UIButton!
#IBOutlet var map: MKMapView!
var locationManger = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationManger.requestWhenInUseAuthorization()
map.showsUserLocation = true
map.userTrackingMode = .follow
}
If you are running on the simulator then you need to simulate a location using the Debug menu in the simulator.

Answer 2

Okay, this information is surprising hard to find (just getting your own location!) — even after watching tutorials I had a hard time. But basically what you're missing is mapView.showsUserLocation = true
Here's the full code, if you need it...
import UIKit
import CoreLocation
import MapKit
class RadiusMapLocationViewController: UIViewController, MKMapViewDelegate {
#IBOutlet weak var mapView: MKMapView!
let coordinate = CLLocationCoordinate2DMake(33.97823607957177, -118.43823725357653)
var locationManager : CLLocationManager = CLLocationManager()
// Authorize use of location
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
mapView.showsUserLocation = (status == .authorizedAlways)
}
// Entering region
func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
showAlert(withTitle: "You've entered \(region.identifier)", message: "Happy hopping!")
}
// Exiting region
func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
showAlert(withTitle: "You've exited \(region.identifier)", message: "")
}
// Creating region and notifying when exit / enter
func region(with geotification: Geotification) -> CLCircularRegion {
let region = CLCircularRegion(center: geotification.coordinate,
radius: geotification.radius,
identifier: geotification.identifier)
region.notifyOnEntry = (geotification.eventType == .onEntry)
region.notifyOnExit = !region.notifyOnEntry
return region
}
// Monitoring region, if not "error"
func startMonitoring(geotification: Geotification) {
if !CLLocationManager.isMonitoringAvailable(for: CLCircularRegion.self) {
showAlert(withTitle:"Error", message: "Geofencing is not supported on this device!")
return
}
}
func stopMonitoring(geotification: Geotification) {
for region in locationManager.monitoredRegions {
guard let circularRegion = region as? CLCircularRegion,
circularRegion.identifier == geotification.identifier else { continue }
locationManager.stopMonitoring(for: circularRegion)
}
}
override func viewDidLoad() {
super.viewDidLoad()
mapView.delegate = self
mapView.userTrackingMode = .follow
mapView.showsUserLocation = true
// Region of coordinate
mapView.region = MKCoordinateRegion(center: coordinate, latitudinalMeters: 800, longitudinalMeters: 800)
mapView.region = MKCoordinateRegion(center: coordinate, latitudinalMeters: 1000, longitudinalMeters: 1000)
let title = "Marina Bar Hop"
let restaurantAnnotation = MKPointAnnotation()
restaurantAnnotation.coordinate = coordinate
restaurantAnnotation.title = title
mapView.addAnnotation(restaurantAnnotation)
let regionRadius = 300.0
let circle = MKCircle(center: coordinate, radius: regionRadius)
mapView.addOverlay(circle)
self.locationManager.requestAlwaysAuthorization()
self.locationManager.delegate = self as? CLLocationManagerDelegate
//Zoom to user location
if let userLocation = locationManager.location?.coordinate {
let viewRegion = MKCoordinateRegion(center: userLocation, latitudinalMeters: 200, longitudinalMeters: 200)
mapView.setRegion(viewRegion, animated: false)
}
}
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let circleRenderer = MKCircleRenderer(overlay: overlay)
circleRenderer.strokeColor = UIColor.red
circleRenderer.lineWidth = 1.0
return circleRenderer
}
}
I have a few additional features on here if you need them. And it sounds like maybe you want to add a pin on the user's current location? It's included in this code too. I hope this helps! :)