MapKit zoom to user current location

Question

I am trying to simply show user\'s location on the map, but I need to when app launches, the map should zoom to current location ,but I don\'t know why map doesn\'t zoom at all

Answer 1

Code:

import UIKit
import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

@IBOutlet weak var mapview: MKMapView!

let locationmanager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    mapview.mapType = MKMapType.standard

    let location = CLLocationCoordinate2DMake(22.4651, 70.0771)

    let span = MKCoordinateSpanMake(0.5, 0.5)
    let region =  MKCoordinateRegionMake(location, span)
    mapview.setRegion(region, animated: true)

    let annonation = MKPointAnnotation()
    annonation.coordinate = location
    annonation.title = "Chandi Bazar"
    annonation.subtitle = "Jamnagar"
    //
    mapview.addAnnotation(annonation)

    self.locationmanager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled()
    {
        locationmanager.delegate = self
        locationmanager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationmanager.startUpdatingLocation()
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
    let locValue:CLLocationCoordinate2D = manager.location!.coordinate
    print("locations = \(locValue.latitude) \(locValue.longitude)")

    locationmanager.stopUpdatingLocation()
}

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?
{
    if (annotation is MKUserLocation)
    {
        return nil
    }

    let annotationidentifier = "Annotationidentifier"

    var annotationview:MKAnnotationView
    annotationview = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationidentifier)

    let btn = UIButton(type: .detailDisclosure)

    btn.addTarget(self, action: #selector(ViewController.hirenagravat(sender:)), for: .touchUpInside)

    annotationview.rightCalloutAccessoryView = btn

    annotationview.image = UIImage(named: "images (4).jpeg")

    annotationview.canShowCallout = true

    return annotationview
}

func hirenagravat(sender:UIButton)
{
    let fvc = storyboard?.instantiateViewController(withIdentifier: "secondViewController") as? secondViewController
    self.navigationController?.pushViewController(fvc!, animated: true)
}

Answer 2

when you set region -> you cannot zoom the map anymore. below to fix that

func yourFuncName() {
//this is global var
regionHasBeenCentered = false
if !self.regionHasBeenCentered {
    let span: MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
    let userLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(_cllocationOfUserCurrentLocation!.coordinate.latitude, _cllocationOfUserCurrentLocation!.coordinate.longitude)
    let region: MKCoordinateRegion = MKCoordinateRegionMake(userLocation, span)

    self.mapView.setRegion(region, animated: true)
    self.regionHasBeenCentered = true
    }

    self.mapView.showsUserLocation = true
}

Answer 3

func animateToUserLocation() {
    if let annoation = mapView.annotations.filter ({ $0 is MKUserLocation }).first {
        let coordinate = annoation.coordinate
        let viewRegion = MKCoordinateRegion(center: coordinate, latitudinalMeters: 200, longitudinalMeters: 200)
        mapView.setRegion(viewRegion, animated: true)
    }
}

Answer 4

In swift 4.1. To change the Zoom level you need to change the span value i.e MKCoordinateSpan(latitudeDelta: 0.95, longitudeDelta: 0.95)

 let lat =  "33.847105"
    let long = "-118.2673272"
    let region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: Double(lat)!, longitude: Double(long)!), span: MKCoordinateSpan(latitudeDelta: 0.95, longitudeDelta: 0.95))
    DispatchQueue.main.async {
        self.mapView.setRegion(region, animated: true)
    }

Swift 5.0

let span = MKCoordinateSpan.init(latitudeDelta: 0.01, longitudeDelta:
0.01)
let coordinate = CLLocationCoordinate2D.init(latitude: 21.282778, longitude: -157.829444) // provide you lat and long 
let region = MKCoordinateRegion.init(center: coordinate, span: span)
mapView.setRegion(region, animated: true)

Answer 5

Here's another approach for Swift 3, XCode 8.2. First, write out a helper function:

let homeLocation = CLLocation(latitude: 37.6213, longitude: -122.3790)
let regionRadius: CLLocationDistance = 200
func centerMapOnLocation(location: CLLocation)
{
    let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
                                           regionRadius * 2.0, regionRadius * 2.0)
    mapView.setRegion(coordinateRegion, animated: true)
}

Then, call in in viewDidLoad()

mapView.showsUserLocation = true
centerMapOnLocation(location: homeLocation)

This will start the app with the location specified in the variable zoomed in.

Answer 6

I faced similar issue and wasted 4 days thinking whats going wrong. Finally resolved with creating these lines of code in viewDidLoad Method :

    //Zoom to user location
    let noLocation = CLLocationCoordinate2D()
    let viewRegion = MKCoordinateRegionMakeWithDistance(noLocation, 200, 200)
    mapView.setRegion(viewRegion, animated: false)
    mapView.showsUserLocation = true

In ViewDidLoad Method add these new changes code :

override func viewDidLoad() {

    super.viewDidLoad()

    let locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest

    // Check for Location Services
    if (CLLocationManager.locationServicesEnabled()) {
        locationManager.requestAlwaysAuthorization()
        locationManager.requestWhenInUseAuthorization()
    }

    //Zoom to user location
    if let userLocation = locationManager.location?.coordinate {
        let viewRegion = MKCoordinateRegionMakeWithDistance(userLocation, 200, 200)
        mapView.setRegion(viewRegion, animated: false)
    }

    self.locationManager = locationManager

    DispatchQueue.main.async {
        self.locationManager.startUpdatingLocation()
    }

}

Hope this helps to resolve your issue. Feel free to post comment if any further issue. Thanks