Repeating Standortdaten mit CLLocation

Question

Dies ist ein wirklich grundlegender Aufwand von dem, was ich bin mit ...

import UIKit 
import MapKit 
import CoreLocation 

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate { 
@IBOutlet weak var mapView: MKMapView! 

// Call the locationManager class 
let LocationManager = CLLocationManager() 

// CoreData Delegate 
let appDelegate = UIApplication.shared.delegate as! AppDelegate 

override func viewDidLoad() { 
    super.viewDidLoad() 

    // Conform to Delegate Method 
    self.LocationManager.delegate = self 

    // Set required accuracy 
    self.LocationManager.desiredAccuracy = kCLLocationAccuracyBest 

    // Blue dot 
    self.mapView.showsUserLocation = true 

} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

// check location services active 
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) { 

    // check location services 
    switch CLLocationManager.authorizationStatus() { 
    case .authorizedAlways: 
     self.LocationManager.startUpdatingLocation() 
    case .notDetermined: 
     self.LocationManager.requestAlwaysAuthorization() 
    case .authorizedWhenInUse, .restricted, .denied: 
     let alertController = UIAlertController(
      title: "Background Location Access Disabled", 
      message: "In order to work your location settings need to be set to 'Always'.", 
      preferredStyle: .alert) 

     let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil) 
     alertController.addAction(cancelAction) 

     let openAction = UIAlertAction(title: "Open Settings", style: .default) { (action) in 
      if let url = NSURL(string:UIApplicationOpenSettingsURLString) { 
       UIApplication.shared.open(url as URL) 
      } 
     } 
     alertController.addAction(openAction) 

     self.present(alertController, animated: true, completion: nil) 
    } 

} 

// Location delegate methods 
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 

    print(locations) 

    // get last location 
    let location = locations.last 

    print(location!.coordinate.latitude) 

    // set region 
    let region = MKCoordinateRegion(center: location!.coordinate, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)) 

    // deploy region to map 
    self.mapView.setRegion(region, animated: true) 

    // Map to follow the user 
    self.mapView.setUserTrackingMode(MKUserTrackingMode.follow, animated: true) 

    // Show compass on map 
    self.mapView.showsCompass = true 

    // save the location data to CoreData 
    //self.save(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude) 

    // end Location updating 
    self.LocationManager.stopUpdatingLocation() 


} 

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) { 
    print("Errors: " + error.localizedDescription) 
} 


} 

Mein Problem ist, dass func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation] nennt mich immer und immer wieder (etwa 3-mal auf Anfangslast) .. Ich verwende die .last die AFAIK soll das letzte Ergebnis in diesem Objekt ziehen .. was es wahrscheinlich ist, wie mit Breakpoints eingefügt es nach den ersten 2 Drucke gibt es nur 1 Menge Ergebnisse zurück ...

Nachdem ich hoch und niedrig gesucht habe, hoffe ich, dass ich ein Ergebnis erzielen kann, indem ich die Frage stelle ... Danke!

Console Ausgabe meiner Frage:

Answer 1

Wenn Sie startUpdatingLocation() der Standort-Manager sofort anrufen startet die Bereitstellung von Standortdaten. Die ersten eingehenden Standorte liegen möglicherweise weit entfernt von Ihrem tatsächlichen Standort. Überprüfen Sie daher die Attribute horizontalAccuracy und verticalAccuracy und schließen Sie Orte ab, die zu ungenau sind.

Answer 2

Es sieht aus wie Sie nur ein One-Shot-Standort erhalten wollen, wenn ja diesen Code versuchen:

// Use: 
// at class level: 
// var manager: LocationOneShotManager? 
// in viewDidLoad: 
// manager = LocationOneShotManager() 
// manager!.fetchWithCompletion {location, error in 
//  // fetch location or an error 
//  if let loc = location { 
//   println(location) 
//  } else if let err = error { 
//   println(err.localizedDescription) 
//  } 
//  self.manager = nil 
// } 


import UIKit 
import CoreLocation 

// possible errors 
enum OneShotLocationManagerErrors: Int { 
    case AuthorizationDenied 
    case AuthorizationNotDetermined 
    case InvalidLocation 
} 

class LocationOneShotManager: NSObject, CLLocationManagerDelegate { 

    // location manager 
    private var locationManager: CLLocationManager? 

    // destroy the manager 
    deinit { 
     locationManager?.delegate = nil 
     locationManager = nil 
    } 

    typealias LocationClosure = ((location: CLLocation?, error: NSError?)->()) 
    private var didComplete: LocationClosure? 

    // location manager returned, call didcomplete closure 
    private func _didComplete(location: CLLocation?, error: NSError?) { 
     locationManager?.stopUpdatingLocation() 
     didComplete?(location: location, error: error) 
     locationManager?.delegate = nil 
     locationManager = nil 
    } 

    // location authorization status changed 
    func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) { 

     switch status { 
     case .AuthorizedWhenInUse: 
      self.locationManager!.startUpdatingLocation() 
     case .Denied: 
      _didComplete(nil, error: NSError(domain: self.classForCoder.description(), 
       code: OneShotLocationManagerErrors.AuthorizationDenied.rawValue, 
       userInfo: nil)) 
     default: 
      break 
     } 
    } 

    internal func locationManager(manager: CLLocationManager, didFailWithError error: NSError) { 
     _didComplete(nil, error: error) 
    } 

    internal func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 
     let location = locations[0] 
     _didComplete(location, error: nil) 
    } 

    // ask for location permissions, fetch 1 location, and return 
    func fetchWithCompletion(completion: LocationClosure) { 
     // store the completion closure 
     didComplete = completion 

     // fire the location manager 
     locationManager = CLLocationManager() 
     locationManager!.delegate = self 

     // check for description key and ask permissions 
     if (NSBundle.mainBundle().objectForInfoDictionaryKey("NSLocationWhenInUseUsageDescription") != nil) { 
      locationManager!.requestWhenInUseAuthorization() 
     } else if (NSBundle.mainBundle().objectForInfoDictionaryKey("NSLocationAlwaysUsageDescription") != nil) { 
      locationManager!.requestAlwaysAuthorization() 
     } else { 
      fatalError("To use location in iOS8 you need to define either NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription in the app bundle's Info.plist file") 
     } 
    } 
}