I'am developing an iOS widget for my weather app, where the user can set the widget to "My location". This means the widget needs to be refreshed on location changes. Since a widget can't run a location manager in the background, apple tech support wrote that you have to setup a location manager in the main app and share the updated location data over App groups to the widget. This part works fine. I also managed to setup a location manager running in the background, but it uses too much battery and shows always the location indicator on top (blue bar) if the app is running, but I don't need this since its not a navigation app or something similar. How to configure a lightweight location manager running in the background?
class WidgetLocationManager: NSObject, CLLocationManagerDelegate {
static let shared: WidgetLocationManager = WidgetLocationManager()
let manager = CLLocationManager()
override init() {
super.init()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyKilometer
manager.distanceFilter = 1000
manager.allowsBackgroundLocationUpdates = true
manager.pausesLocationUpdatesAutomatically = false
manager.activityType = .other
manager.showsBackgroundLocationIndicator = false
}
func setupWidgetLocationManager() {
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
manager.startMonitoringSignificantLocationChanges()
}
func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
if manager.authorizationStatus == .notDetermined || manager.authorizationStatus == .denied || manager.authorizationStatus == .restricted {
manager.stopUpdatingLocation()
manager.stopMonitoringSignificantLocationChanges()
}
if manager.authorizationStatus == .authorizedAlways || manager.authorizationStatus == .authorizedWhenInUse {
manager.startUpdatingLocation()
manager.startMonitoringSignificantLocationChanges()
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let newestLocation = locations.last {
UserDefaults(suiteName: "group.com.***")?.set(Double(newestLocation.coordinate.latitude), forKey: "newest_location_latitude")
UserDefaults(suiteName: "group.com.***")?.set(Double(newestLocation.coordinate.longitude), forKey: "newest_location_longitude")
UserDefaults(suiteName: "group.com.***")?.set(Double(newestLocation.altitude), forKey: "newest_location_altitude")
WidgetCenter.shared.reloadAllTimelines()
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
}
}
Capability for background modes location is set, also mandatory strings in info.plist for location privacy info.
