Get User Location Every 5 minutes with background modes in Swift 3 - ios

Question

I want to ;
Get User Location Every 5 minutes with background modes in Swift 3
But my codes don't any action. I need to get and send server ,longitude , latitude , and altitude values every 5 minutes
My codes under below.
AppDelegate.swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
sleep(2)
BackgroundLocationManager.instance.start()
return true
}
BackgroundLocationManager - Class
import Foundation
import CoreLocation
import UIKit
class BackgroundLocationManager :NSObject, CLLocationManagerDelegate {
static let instance = BackgroundLocationManager()
static let BACKGROUND_TIMER = 15.0 // restart location manager every 150 seconds
static let UPDATE_SERVER_INTERVAL = 60 * 5 // 5 minutes server send
let locationManager = CLLocationManager()
var timer:Timer?
var currentBgTaskId : UIBackgroundTaskIdentifier?
var lastLocationDate : NSDate = NSDate()
private override init(){
super.init()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
locationManager.activityType = .other;
locationManager.distanceFilter = kCLDistanceFilterNone;
if #available(iOS 9, *){
locationManager.allowsBackgroundLocationUpdates = true
}
NotificationCenter.default.addObserver(self, selector: #selector(self.applicationEnterBackground), name: NSNotification.Name.UIApplicationDidEnterBackground, object: nil)
}
func applicationEnterBackground(){
// FileLogger.log("applicationEnterBackground")
start()
}
func start(){
if(CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways){
if #available(iOS 9, *){
locationManager.requestLocation()
} else {
locationManager.startUpdatingLocation()
}
} else {
locationManager.requestAlwaysAuthorization()
}
}
func restart (){
timer?.invalidate()
timer = nil
start()
}
private func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
switch status {
case CLAuthorizationStatus.restricted: break
//log("Restricted Access to location")
case CLAuthorizationStatus.denied: break
//log("User denied access to location")
case CLAuthorizationStatus.notDetermined: break
//log("Status not determined")
default:
//log("startUpdatintLocation")
if #available(iOS 9, *){
locationManager.requestLocation()
} else {
locationManager.startUpdatingLocation()
}
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if(timer==nil){
// The locations array is sorted in chronologically ascending order, so the
// last element is the most recent
guard locations.last != nil else {return}
beginNewBackgroundTask()
locationManager.stopUpdatingLocation()
let now = NSDate()
if(isItTime(now: now)){
//TODO: Every n minutes do whatever you want with the new location. Like for example sendLocationToServer(location, now:now)
}
}
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error)
beginNewBackgroundTask()
locationManager.stopUpdatingLocation()
}
func isItTime(now:NSDate) -> Bool {
let timePast = now.timeIntervalSince(lastLocationDate as Date)
let intervalExceeded = Int(timePast) > BackgroundLocationManager.UPDATE_SERVER_INTERVAL
return intervalExceeded;
}
func sendLocationToServer(location:CLLocation, now:NSDate){
//TODO
}
func beginNewBackgroundTask(){
var previousTaskId = currentBgTaskId;
currentBgTaskId = UIApplication.shared.beginBackgroundTask(expirationHandler: {
// FileLogger.log("task expired: ")
})
if let taskId = previousTaskId{
UIApplication.shared.endBackgroundTask(taskId)
previousTaskId = UIBackgroundTaskInvalid
}
timer = Timer.scheduledTimer(timeInterval: BackgroundLocationManager.BACKGROUND_TIMER, target: self, selector: #selector(self.restart),userInfo: nil, repeats: false)
}
}