Button to center view to user location using MapKit

Question or problem in the Swift programming language:

Is there a dedicated button in MapKit that centers camera over user location? Or do I have to do it manually creating button and toggle mapView.showsUserLocation = true?

How to solve the problem:

Solution 1:

This way runs well (Swift), and you can customize the button:

class YourViewController{
   ...
   @IBOutlet weak var mapView:MKMapView
   ...

   override func viewDidLoad() {
      super.viewDidLoad()
      ...
      addMapTrackingButton()
   }

   func addMapTrackingButton(){
      let image = UIImage(named: "trackme") as UIImage?
      let button   = UIButton(type: UIButtonType.System) as UIButton
      button.frame = CGRectMake(5, 5, 35, 35)
      button.setImage(image, forState: .Normal)
      button.backgroundColor = .clearColor()
      button.addTarget(self, action: #selector(YourViewController.centerMapOnUserButtonClicked), forControlEvents:.TouchUpInside)
      self.mapView.addSubview(button)
   }

   func centerMapOnUserButtonClicked() {
      self.mapView.setUserTrackingMode( MKUserTrackingMode.Follow, animated: true)
   }
   ...
}

Swift 4:

func addMapTrackingButton(){
    let image = UIImage(named: "trackme") as UIImage?
    let button   = UIButton(type: UIButtonType.custom) as UIButton
    button.frame = CGRect(origin: CGPoint(x:5, y: 25), size: CGSize(width: 35, height: 35))
    button.setImage(image, for: .normal)
    button.backgroundColor = .clear
    button.addTarget(self, action: #selector(ViewController.centerMapOnUserButtonClicked), for:.touchUpInside)
    mapView.addSubview(button)
}

@objc func centerMapOnUserButtonClicked() {
    mapView.setUserTrackingMode(MKUserTrackingMode.follow, animated: true)
}

Solution 2:

Being late, ahah, but I just found the function :

CLLocationManager.requestLocation()

So once you properly set your locationManager (with requestAlwaysAuthorization) you can call it wherever you want to center your map on your own location 🙂

Solution 3:

You need to take the user location coordinate and set the region.

- (IBAction)centerMapOnUserButtonClicked:(id)sender {
MKCoordinateSpan span = MKCoordinateSpanMake(0.0001f, 0.0001f);
    CLLocationCoordinate2D coordinate = self.mapView.userLocation.coordinate;
    MKCoordinateRegion region = {coordinate, span};

    MKCoordinateRegion regionThatFits = [self.mapView regionThatFits:region];
    NSLog(@"Fit Region %f %f", regionThatFits.center.latitude, regionThatFits.center.longitude);

    [self.mapView setRegion:regionThatFits animated:YES];
}

Solution 2:

MKUserTrackingBarButtonItem *trackButton = [[MKUserTrackingBarButtonItem alloc] initWithMapView:mapView];   
[trackButton setTarget:self];
[trackButton setAction:@selector(track:)];

[toolbar setItems:[NSArray arrayWithObjects:trackButton, nil] animated:YES];  

Swift 4:

let trackButton = MKUserTrackingBarButtonItem.init(mapView: mapView)
trackButton.target = self
trackButton.action = #selector(ViewController.track)

toolbar.items?.append(trackButton)

Hope this helps!