How to get altitude with startMonitoringSignificantLocationChanges in swift 5?

Question

Created Aug ’20

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I am using CoreLocation in my application. I want to track significant changes in location and altitude. So I have used startMonitoringSignificantLocationChanges, but not getting altitude.

Here is my code :

Code Block 
public class MyLocationManager: NSObject {
    public var currentLocation = CLLocation()
    private var locationManager = CLLocationManager()
    public override init() {
        super.init()
        self.configureLocationManager()
    }
    private func configureLocationManager() {
        self.locationManager.delegate = self
        self.locationManager.pausesLocationUpdatesAutomatically = false
        self.locationManager.allowsBackgroundLocationUpdates = true
        self.locationManager.requestAlwaysAuthorization()
    }
    public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        self.currentLocation = locations.last ?? CLLocation()
        let lat: Double = self.currentLocation.coordinate.latitude
        let long: Double = self.currentLocation.coordinate.longitude
        let alt: Double = self.currentLocation.altitude
        let dateTime = self.currentLocation.timestamp
        print("\n\nLatitude :---- \(lat)")
        print("Longitude :---- \(long)")
        print("Altitude :---- \(alt)")
        print("Date :---- \(dateTime)")
    }
}

Then I run app.
Allow location for Always
Check for location update (Location is updating but not getting altitude)
Sent app in background (Location is updating but not getting altitude)
Kill app / Full closed / Remove from background / Terminated (Location is not updating sometime and not getting altitude)

Can anyone help me with this problem?

Boost

Answer 1

Technology Evangelist OP

Apple

Aug ’20

Hmmm...if you have a valid CLLocation object and are outside within range of a GPS satellite, you should have a value for currentLocation.altitude. Perhaps it's a cached value where altitude wasn't available?

You may want to run a test that takes the significant location change API out of the mix by adding a button to trigger an explicit location request via locationManager.requestLocation(), then walk outside, tap the button, and see what you get.

This just worked for me:

Code Block     @IBAction func getCurrentLocationTapped(_ sender: Any) {
	/* request location data for one-off usage */
	self.locationManager.requestLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
	/* the last element is the most recent location */
	if let location = locations.last {
		latitudeLabel.text = "\(location.coordinate.latitude)"
		longitudeLabel.text = "\(location.coordinate.longitude)"
		altitudeLabel.text = "\(location.altitude)"
	}
}

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