ポジショニングの使用を開始する

<key>UIRequiredDeviceCapabilities</key>
<array>
   <string>location-services</string>
   <string>gps</string>
</array>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
   <string>This app needs to access your current location to display it on the map.</string>
<key>NSLocationWhenInUseUsageDescription</key>
   <string>This app needs to access your current location to display it on the map.</string>
<key>NSMotionUsageDescription</key>
   <string>Motion detection is needed to determine more accurate locations, when no GPS signal is found or used.</string>

import CoreLocation

// ...

private func startLocating() {
    if locationEngine.start(locationAccuracy: .bestAvailable) == .missingPermissions {
        // App is missing location permission, let's request it.
        requestLocationAuthorization()
    }
}

// ...

public func requestLocationAuthorization() {
    // Get current location authorization status.
    let locationAuthorizationStatus = CLLocationManager.authorizationStatus()

    // Check authorization.
    switch locationAuthorizationStatus {
    case .restricted:
        // Access to location services restricted in the system settings.
        let alert = UIAlertController(title: "Location Services are restricted", message: "Please remove Location Services restriction in your device Settings", preferredStyle: .alert)
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        alert.addAction(okAction)
        present(alert, animated: true, completion: nil)
        return

    case .denied:
        // Location access denied for the application.
        let alert = UIAlertController(title: "Location access is denied", message: "Please allow location access for the application in your device Settings", preferredStyle: .alert)
        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        alert.addAction(okAction)
        present(alert, animated: true, completion: nil)
        return

    case .authorizedWhenInUse, .authorizedAlways:
        // Authorization ok.
        break

    case .notDetermined:
        locationManager.requestWhenInUseAuthorization()
        break

    default:
        break
    }
}

// Create instance of location engine.
do {
    try locationEngine = LocationEngine()
} catch let engineInstantiationError {
    fatalError("Failed to initialize LocationEngine. Cause: \(engineInstantiationError)")
}

if let myLastLocation = locationEngine.lastKnownLocation {
    // Log the last known location coordinates.
    print("Last known location: '%f', '%f'", myLastLocation.coordinates.latitude, myLastLocation.coordinates.longitude)
}

class PositioningExample: LocationStatusDelegate {

    func onStatusChanged(locationEngineStatus: LocationEngineStatus) {
        print("LocationEngineStatus: : \(locationEngineStatus)")
    }

    func onFeaturesNotAvailable(features: [LocationFeature]) {
        for feature in features {
            print("Feature not available: '%s'", String(describing: feature))
        }
    }

// ...

    locationEngine.addLocationStatusDelegate(locationStatusDelegate: self)

// ...

}

class PositioningExample: LocationDelegate {

    func onLocationUpdated(location: Location) {
        print("Location updated: \(location.coordinates)")
    }

// ...

    locationEngine.addLocationDelegate(locationDelegate: self)

// ...

}

class PositioningExample: LocationStatusDelegate, LocationDelegate {

// ...

    private func startLocating() {
        locationEngine.addLocationStatusDelegate(locationStatusDelegate: self)
        locationEngine.addLocationDelegate(locationDelegate: self)
        if locationEngine.start(locationAccuracy: .bestAvailable) == .missingPermissions {
            requestLocationAuthorization()
        }
    }

// ...

}

class PositioningExample: LocationStatusDelegate, LocationDelegate {

// ...

    public func stopLocating() {
        locationEngine.removeLocationDelegate(locationDelegate: self)
        locationEngine.removeLocationStatusDelegate(locationStatusDelegate: self)
        locationEngine.stop()
    }

// ...

}

//Default start-up location.
private static let defaultGeoCoordinates = GeoCoordinates(latitude: 52.520798, longitude: 13.409408)

// LocationIndicator object to represent device's current location.
private var locationIndicator: LocationIndicator!

// ...

private func addMyLocationToMap(myLocation: Location) {
    // Setup location indicator.
    locationIndicator = LocationIndicator()
    // Enable a halo to indicate the horizontal accuracy.
    locationIndicator.isAccuracyVisualized = true
    locationIndicator.locationIndicatorStyle = .pedestrian;
    locationIndicator.updateLocation(myLocation)
    locationIndicator.enable(for: mapView)
    // Point camera to current location.
    let distanceInMeters = MapMeasure(kind: .distanceInMeters,
                                      value: PositioningExample.defaultCameraDistance)
    mapCamera.lookAt(point: myLocation.coordinates,
                     zoom: distanceInMeters)
}

private func updateMyLocationOnMap(myLocation: Location) {
    // Update location indicator.
    locationIndicator.updateLocation(myLocation)
    // Point camera to current location.
    mapCamera.lookAt(point: myLocation.coordinates)
}

// ...

if let lastLocation = locationEngine.lastKnownLocation {
    addMyLocationToMap(myLocation: lastLocation)
} else {
    var defaultLocation = Location(coordinates: PositioningExample.defaultGeoCoordinates)
    defaultLocation.time = Date()
    addMyLocationToMap(myLocation: defaultLocation)
}

// ...

func onLocationUpdated(_ location: Location) {
    updateMyLocationOnMap(myLocation: location)
}