Sending Latitude and Longitude to Server When App Is in Background

Sending Latitude and Longitude to Server when app is in background

Ok.

After struggling for 3days, it is working for me for sending latitude and longitude when app is in background even after 3 mins.

I checked my app, continuously sending lat long for more than a hour in background.

It can help some one at least.

First Please add below two keys in your pList.

 1.NSLocationAlwaysUsageDescription
2.NSLocationWhenInUseUsageDescription

Bothe are strings and you can give any value.

Then please turn on background fetch and check location updates under capabilities in project section.

Then import Corelocation framework and add this below code.

locationManager is a global variable.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
//create CLLocationManager variable
locationManager = [[CLLocationManager alloc] init];
//set delegate
locationManager.delegate = self;

app = [UIApplication sharedApplication];
// This is the most important property to set for the manager. It ultimately determines how the manager will
// attempt to acquire location and thus, the amount of power that will be consumed.

if ([locationManager respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) {
[locationManager setAllowsBackgroundLocationUpdates:YES];
}
locationManager.desiredAccuracy = 45;
locationManager.distanceFilter = 100;
// Once configured, the location manager must be "started".
[locationManager startUpdatingLocation];
}

- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

[locationManager stopUpdatingLocation];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
[locationManager setDistanceFilter:kCLDistanceFilterNone];
locationManager.pausesLocationUpdatesAutomatically = NO;
locationManager.activityType = CLActivityTypeAutomotiveNavigation;
[locationManager startUpdatingLocation];
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

[locationManager stopUpdatingLocation];

__block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
bgTask = UIBackgroundTaskInvalid;
}];

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(startTrackingBg)
userInfo:nil
repeats:YES];

}

-(void)startTrackingBg {

[locationManager startUpdatingLocation];
NSLog(@"App is running in background");
}
//starts automatically with locationManager
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
latitude=newLocation.coordinate.latitude;
longitude=newLocation.coordinate.longitude;
NSLog(@"Location: %f, %f",newLocation.coordinate.longitude, newLocation.coordinate.latitude);
}

sending current location to server in background as well as in running app using AFNetworking 3

Check this when your app is running in foreground.

How can I get current location from user in iOS

Check this to send location when your app is in background.

Sending Latitude and Longitude to Server when app is in background

after getting latitude and longitude, send by using AFNetworking framework.

OR

If you need from scratch if you dont know how to get location then follow the below steps to get latitude and longitude.

Add this below two string types in your info.pList

Sample Image

Then add CoreLocation Framework in your project.

Import it to your ViewController.h

 #import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController<CLLocationManagerDelegate>
@property(nonatomic, retain) CLLocationManager *locationManager;

@end

Then do below one in your ViewController.m

 #define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
#ifdef __IPHONE_8_0
if(IS_OS_8_OR_LATER) {
// Use one or the other, not both. Depending on what you put in info.plist
[self.locationManager requestWhenInUseAuthorization];
[self.locationManager requestAlwaysAuthorization];
}
#endif
[self.locationManager startUpdatingLocation];

}

-(void)viewWillAppear:(BOOL)animated {

NSLog(@"latitude: %f, longitude: %f",self.locationManager.location.coordinate.latitude,self.locationManager.location.coordinate.longitude);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

Log will show the latitude and longitude.

Send the location to the server every n minutes in the background in swift

In DidBackground:

  1. stop normalTimer.
  2. start New backgroundTaskTimer

In WillForeground:

  1. stop backgroundTaskTimer.
  2. start normalTimer

Find below sample code:

In Appdelegate:

Declaration:

  var backgroundUpdateTask: UIBackgroundTaskIdentifier!

var backgroundTaskTimer:Timer! = Timer()

Implementation:

func doBackgroundTask() {
DispatchQueue.global(qos: .default).async {
self.beginBackgroundTask()

if self.backgroundTaskTimer != nil {
self.backgroundTaskTimer.invalidate()
self.backgroundTaskTimer = nil
}

//Making the app to run in background forever by calling the API
self.backgroundTaskTimer = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(self.startTracking), userInfo: nil, repeats: true)
RunLoop.current.add(self.backgroundTaskTimer, forMode: RunLoopMode.defaultRunLoopMode)
RunLoop.current.run()

// End the background task.
self.endBackgroundTask()

}
}

func beginBackgroundTask() {
self.backgroundUpdateTask = UIApplication.shared.beginBackgroundTask(withName: "Track trip", expirationHandler: {
self.endBackgroundTask()
})
}

func endBackgroundTask() {
UIApplication.shared.endBackgroundTask(self.backgroundUpdateTask)
self.backgroundUpdateTask = UIBackgroundTaskInvalid
}

In ApplicationDidEnterBackground:

 func applicationDidEnterBackground(_ application: UIApplication) {

//Start the background fetch
self.doBackgroundTask()
}

In ApplicationWillEnterForeground:

func applicationWillEnterForeground(_ application: UIApplication) {

if self.backgroundTaskTimer != nil {
self.backgroundTaskTimer.invalidate()
self.backgroundTaskTimer = nil
}
}


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