Search code examples
iosswiftcllocationmanager

center the map on user's location didn't show the blue dot

I have a tab bar, one is used to display the map. When I switch to this tab bar, it will request permission and get the current location automatically.

I finished the code, set the simulated location to Apple, it will show a blue dot in the center of the screen, but when I chose the custom location, specify a location, the blue dot is not displayed in the center of the map.

I need to drag the map, and will find the blue dot near the center location about 1~2km. I tested on the real device and have the same problem.

use the method to show the current location auto, but not show the blue dot.

 override func viewDidLoad() {
        super.viewDidLoad()
        locationManager = CLLocationManager()
        locationManager!.delegate = self
        
        if CLLocationManager.authorizationStatus() == .authorizedWhenInUse{
            locationManager!.startUpdatingLocation()
            locationManager!.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        }else{
            locationManager!.requestWhenInUseAuthorization()
        }
        
    }
 func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let newLocation = locations.last!
        let coordinateRegion = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 100, 100)
        mapView.setRegion(mapView.regionThatFits(coordinateRegion), animated: true)
        location = newLocation
        locationManager?.stopUpdatingLocation()
        locationManager = nil
}

I added a button - when it not show the blue dot, clicking the button will set the blue dot in the center of the map. The two methods have the same function, but they produce different views. Why?

@IBAction func showUser() {
let region = MKCoordinateRegionMakeWithDistance(mapView.userLocation.coordinate, 100, 100)
        mapView.setRegion(mapView.regionThatFits(region), animated: true)
}

Screenshot

Screenshot

Solution

  • I just use this coding to update to location with center of mapview

    Please add this keys into info.plist file 

        <key>NSLocationWhenInUseUsageDescription</key>
    <string></string>
    <key>NSLocationAlwaysUsageDescription</key>
    <string></string>


override func viewDidLoad() {
  super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        locationManager.delegate = self
        map.delegate = self
        map.showsUserLocation = true
        if CLLocationManager.authorizationStatus() == .authorizedWhenInUse{
            locationManager.startUpdatingLocation()
            locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
        }else{
            locationManager.requestWhenInUseAuthorization()
        }

    }
    func mapView(_ mapView: MKMapView, didUpdate userLocation: MKUserLocation) {
        mapView .setCenter(userLocation.coordinate, animated: true)
    }

    You can download demo from HERE