I\'m looking for a way to get a background location update every n minutes in my iOS application. I\'m using iOS 4.3 and the solution should work for non-jailbroken iPhones
Attached is a Swift solution based in:
Define App registers for location updates
in the info.plist
Keep the locationManager running all the time
Switch kCLLocationAccuracy
between BestForNavigation
(for 5 secs to get the location) and ThreeKilometers
for the rest of the wait period to avoid battery drainage
This example updates location every 1 min in Foreground and every 15 mins in Background.
The example works fine with Xcode 6 Beta 6, running in a iOS 7 device.
In the App Delegate (mapView is an Optional pointing to the mapView Controller)
func applicationDidBecomeActive(application: UIApplication!) {
if appLaunched! == false { // Reference to mapView used to limit one location update per timer cycle
appLaunched = true
var appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
var window = appDelegate.window
var tabBar = window?.rootViewController as UITabBarController
var navCon = tabBar.viewControllers[0] as UINavigationController
mapView = navCon.topViewController as? MapViewController
}
self.startInitialPeriodWithTimeInterval(60.0)
}
func applicationDidEnterBackground(application: UIApplication!) {
self.startInitialPeriodWithTimeInterval(15 * 60.0)
}
func startInitialPeriodWithTimeInterval(timeInterval: NSTimeInterval) {
timer?.invalidate() // reset timer
locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
timer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: Selector("getFirstLocationUpdate:"), userInfo: timeInterval, repeats: false)
}
func getFirstLocationUpdate(sender: NSTimer) {
let timeInterval = sender.userInfo as Double
timer?.invalidate()
mapView?.canReportLocation = true
timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval, target: self, selector: Selector("waitForTimer:"), userInfo: timeInterval, repeats: true)
}
func waitForTimer(sender: NSTimer) {
let time = sender.userInfo as Double
locationManager?.desiredAccuracy = kCLLocationAccuracyBestForNavigation
finalTimer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: Selector("getLocationUpdate"), userInfo: nil, repeats: false)
}
func getLocationUpdate() {
finalTimer?.invalidate()
mapView?.canReportLocation = true
}
In the mapView (locationManager points to the object in the AppDelegate)
override func viewDidLoad() {
super.viewDidLoad()
var appDelegate = UIApplication.sharedApplication().delegate! as AppDelegate
locationManager = appDelegate.locationManager!
locationManager.delegate = self
canReportLocation = true
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
if canReportLocation! {
canReportLocation = false
locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
} else {
//println("Ignore location update")
}
}