How to show my location and pin in map correctly on Swift?

Question

I'm trying sshow my location in app Swift but this not show anything, the map is all blue..

My code is this form a tutorial on internet:

 var latitude:CLLocationDegrees = location.location.coordinate.latitude
    var longitude:CLLocationDegrees = location.location.coordinate.longitude
    var homeLati: CLLocationDegrees = 40.01540192
    var homeLong: CLLocationDegrees = 20.87901079
    var latDelta:CLLocationDegrees = 0.01
    var longDelta:CLLocationDegrees = 0.01
    var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)

    var myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    var region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
    self.mapKit.setRegion(region, animated: true)

    self.mapKit.showsUserLocation = true
    ///Red Pin
    var myHomePin = MKPointAnnotation()
    myHomePin.coordinate = myHome
    myHomePin.title = "Home"
    myHomePin.subtitle = "Bogdan's home"
    self.mapKit.addAnnotation(myHomePin)

I have imported corresponding configuration in .split.. What is bad on this code?

Thanks!

Solution 1

To display location on map using latitude and longitude.

 var latDelta:CLLocationDegrees = 0.01

 var longDelta:CLLocationDegrees = 0.01

 var theSpan:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
 var pointLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(your latitude, your longitude)

 var region:MKCoordinateRegion = MKCoordinateRegionMake(pointLocation, theSpan)
  mapView.setRegion(region, animated: true)

  var pinLocation : CLLocationCoordinate2D = CLLocationCoordinate2DMake(your latitude, your longitude)
  var objectAnnotation = MKPointAnnotation()
  objectAnnotation.coordinate = pinLocation
  objectAnnotation.title = your title
  self.mapView.addAnnotation(objectAnnotation)

Solution 2

You can do like this:

import UIKit

import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

let locationManager = CLLocationManager()  // Here it is an object to get the user's location.



@IBOutlet weak var mapView: MKMapView!    // It is my map.


override func viewDidLoad() {
    super.viewDidLoad()

    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.requestWhenInUseAuthorization()
    locationManager.requestLocation()
    // To initialize locationManager (). Now it can give you the user's location.        


    map.delegate = self
    map.showsUserLocation = true
    // To initialize the map.

}// Here you should initialize locationManager and your map. I send you the code later.

func dropPinZoomIn(placemark: MKPlacemark){   // This function will "poste" the dialogue bubble of the pin.
    var selectedPin: MKPlacemark?

    // cache the pin
    selectedPin = placemark    // MKPlacemark() give the details like location to the dialogue bubble. Place mark is initialize in the function getLocationAddress (location: ) who call this function.

    // clear existing pins to work with only one dialogue bubble.
    mapView.removeAnnotations(mapView.annotations)
    let annotation = MKPointAnnotation()    // The dialogue bubble object.
    annotation.coordinate = placemark.coordinate   
    annotation.title = placemark.name// Here you should test to understand where the location appear in the dialogue bubble.

    if let city = placemark.locality,
        let state = placemark.administrativeArea {
        annotation.subtitle = String((city))+String((state));
    } // To "post" the user's location in the bubble.

    mapView.addAnnotation(annotation)     // To initialize the bubble.
    let span = MKCoordinateSpanMake(0.05, 0.05)
    let region = MKCoordinateRegionMake(placemark.coordinate, span)
    mapView.setRegion(region, animated: true)   // To update the map with a center and a size.
}

func getLocationAddress(location:CLLocation) {    // This function give you the user's address from a location like locationManager.coordinate (it is usually the user's location).
    let geocoder = CLGeocoder()

    print("-> Finding user address...")

    geocoder.reverseGeocodeLocation(location, completionHandler: {(placemarks, error)->Void in
        var placemark:CLPlacemark!

        if error == nil && placemarks!.count > 0 {
            placemark = placemarks![0] as CLPlacemark


            var addressString : String = ""
            if placemark.ISOcountryCode == "TW" /*Address Format in Chinese*/ {
                if placemark.country != nil {  // To have the country
                    addressString = placemark.country!
                }
                if placemark.subAdministrativeArea != nil {  // To have the subAdministrativeArea.
                    addressString = addressString + placemark.subAdministrativeArea! + ", "
                }
                if placemark.postalCode != nil {   // To ...
                    addressString = addressString + placemark.postalCode! + " "
                }
                if placemark.locality != nil {
                    addressString = addressString + placemark.locality!
                }
                if placemark.thoroughfare != nil {
                    addressString = addressString + placemark.thoroughfare!
                }
                if placemark.subThoroughfare != nil {
                    addressString = addressString + placemark.subThoroughfare!
                }
            } else {
                if placemark.subThoroughfare != nil {
                    addressString = placemark.subThoroughfare! + " "
                }
                if placemark.thoroughfare != nil {
                    addressString = addressString + placemark.thoroughfare! + ", "
                }
                if placemark.postalCode != nil {
                    addressString = addressString + placemark.postalCode! + " "
                }
                if placemark.locality != nil {
                    addressString = addressString + placemark.locality! + ", "
                }
                if placemark.administrativeArea != nil {
                    addressString = addressString + placemark.administrativeArea! + " "
                }
                if placemark.country != nil {
                    addressString = addressString + placemark.country!
                }

                let new_placemark: MKPlacemark = MKPlacemark (placemark: placemark)

                // new_placemark initialize a variable of type MKPlacemark () from geocoder to use the function dropPinZoomIn (placemark:).


                self.dropPinZoomIn (new_placemark)

                print (placemark.description)   // You can see the place mark's details like the country.

            }


        }
    })

}

I give you an easily location systeme where you can have the user's address, the user's location and show it in a map with dialogues bubbles who displays the user's location. You can have more documentation in Thorn web site with dialogue or in apple developer web site.

Comments

[Anthony Kong]

possible duplicate of Swift - Add MKAnnotationView To MKMapView

[user3745888]

I'm using the code in that question.The problem in that post was adding pin annotation, my problem is showing location in map, I can't show anything in the map. the map is clear

[user3745888]

I was forgetting the NSLocationAlwaysUsageDescription in plist, for this reason I can't show never in mapView.. Thanks!! this was said in the other, you were right!

[Werner Henze]

Can you please add an Explanation of what you did and why!?