我正在尝试在一个MKMapView中展示用户的当前位置,mapView
。我已经请求了权限并且认为我已经做好了所有准备工作,但是由于某些原因,当前位置没有显示在地图上。
以下是代码。不要在意分段控件,我只是用它们来改变地图类型。
import UIKit
import MapKit
let annotationId = "annotationID";
class ViewController: UIViewController, CLLocationManagerDelegate {
@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var segControls: UISegmentedControl!
let locationManager = CLLocationManager();
var zoomToUserLocation = false;
// Switch statements for the seg controls.
@IBAction func mapType(sender: UISegmentedControl) {
switch segControls.selectedSegmentIndex {
case 0:
mapView.mapType = MKMapType.Standard
case 1:
mapView.mapType = MKMapType.Satellite
case 2:
mapView.mapType = MKMapType.Hybrid
default:
mapView.mapType = MKMapType.Standard
}
}
override func viewDidLoad() {
super.viewDidLoad()
// We are setting the delegate equal to self here to be able to use the indentifier that deques the annotations.
locationManager.delegate = self
// Status of user is variable that speaks directly to (in this case) authorization status
let status = CLLocationManager.authorizationStatus()
if status == CLAuthorizationStatus.NotDetermined {
locationManager.requestWhenInUseAuthorization()
} else if status != .Denied {
locationManager.startUpdatingLocation()
}
// let annotation = MKPointAnnotation();
}
// If the status changes to authorize when in use or always authorize
// then start updating the location, if not don't do anything.
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == CLAuthorizationStatus.AuthorizedWhenInUse || status == CLAuthorizationStatus.AuthorizedAlways {
locationManager.startUpdatingLocation()
}
}
// If the location failed when trying to get users location execute this function
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
println("Error: \(error)")
}
}
extension ViewController: MKMapViewDelegate {
func mapView(mapView: MKMapView!, didUpdateUserLocation userLocation: MKUserLocation!) {
let coordinate = userLocation.coordinate; // this sets the var coordinates to the location of the user.
println("User Location = (\(coordinate.latitude), \(coordinate.longitude))");
if zoomToUserLocation == true {
let locationOfDevice: CLLocation = userLocation.location // this determines the location of the device using the users location
let deviceCoordinate: CLLocationCoordinate2D = locationOfDevice.coordinate // determines the coordinates of the device using the location device variabel which has in it the user location.
let span = MKCoordinateSpan(latitudeDelta: 1, longitudeDelta: 1) // this determines the span in which its determined that 1 degree is 69 miles.
let region = MKCoordinateRegion(center: deviceCoordinate, span: span) // set the center equal to the device coordinates and the span equal to the span variable we have created this will give you the region.
mapView.setRegion(region, animated: true);
}
}
}