CODEWITHSUNDEEP
iosswiftcore-locationcllocationmanager
David
David

Reputation: 3318

App crashes when using locationManager.requestLocation()

I have this code:

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        self.locationManager.requestWhenInUseAuthorization()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        super.viewDidLoad()
    }
    @IBAction func sendLocation() {
        locationManager.startUpdatingLocation()
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let coordinate = locations.last?.coordinate else { return }
        print(String(coordinate.latitude))
        locationManager.stopUpdatingLocation()
    }
}

When clinking on the UIButton, the IBAction gets called and the current users location is shown in the console.

Since I need to get the location only once, I would like to use locationManager.requestLocation().

But when removing locationManager.stopUpdatingLocation() and replacing locationManager.startUpdatingLocation() with locationManager.requestLocation(), the app crashes when pressing the UIButton with following logs in the console:

2019-01-09 15:48:36.585518+0100 GetLocation[1206:248754] *** Assertion failure in -[CLLocationManager requestLocation], /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreLocationFramework/CoreLocation-2245.8.25/Framework/CoreLocation/CLLocationManager.m:897

2019-01-09 15:48:36.586443+0100 GetLocation[1206:248754] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Delegate must respond to locationManager:didFailWithError:'

*** First throw call stack:

(0x1b4e08ec4 0x1b3fd9a50 0x1b4d1eb3c 0x1b580d1d0 0x1bbcd8280 0x104690028 0x10469005c 0x1e20f23f8 0x1e1b7ffb8 0x1e1b802d8 0x1e1b7f2d8 0x1e212bb50 0x1e212cdb4 0x1e210c0b0 0x1e21daf1c 0x1e21dd914 0x1e21d6404 0x1b4d991f0 0x1b4d99170 0x1b4d98a54 0x1b4d93920 0x1b4d931f0 0x1b700c584 0x1e20f0ce4 0x104691564 0x1b4852bb4)

libc++abi.dylib: terminating with uncaught exception of type NSException

(lldb)

Why that? What am I doing wrong?

Upvotes: 1

Views: 2872

Answers (3)

Lal Krishna
Lal Krishna

Reputation: 16160

The reason is clearly described.

reason: 'Delegate must respond to locationManager:didFailWithError:'

You must implement 

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {

}

As the requesting location takes place asynchronously, it will take time. When the location is with Location Manger, it notify user via locationManager:didUpdateLocations:

Upvotes: 0

David Pasztor
David Pasztor

Reputation: 54706

The error message is pretty clear. You need to implement the other delegate method, locationManager(_:, didFailWithError:).

class ViewController: UIViewController, CLLocationManagerDelegate {

    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        self.locationManager.requestWhenInUseAuthorization()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        super.viewDidLoad()
    }

    @IBAction func sendLocation() {
        locationManager.requestLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let coordinate = locations.last?.coordinate else { return }
        print(String(coordinate.latitude))
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        // handle the error
    }
}

Upvotes: 0

Shehata Gamal
Shehata Gamal

Reputation: 100503

You may need to implement

func locationManager(_ manager: CLLocationManager, 
         didFailWithError error: Error) {  --- }

Delegate method of CLLocationManagerDelegate

Upvotes: 3

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