Send silent push notifications to the app, update location and send to server in background

Question

I want to send a quiet push notification to an application that is in the background, then select the current location of the user and send it to the web service.

I implemented push notification methods, as well as those two:

- (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    NSDate *fetchStart = [NSDate date];

    [self sendLocationToServerWithCompletionHandler:^(UIBackgroundFetchResult result) {
        completionHandler(result);

        NSDate *fetchEnd = [NSDate date];
        NSTimeInterval timeElapsed = [fetchEnd timeIntervalSinceDate:fetchStart];
        NSLog(@"Background Fetch Duration: %f seconds", timeElapsed);

    }];
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{

}

I also created a method that sends the location to the server:

- (void)sendLocationToServerWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    NSDictionary *params = @{
                             @"UserId"      : self.userId,
                             @"Latitude"    : self.latitude,
                             @"Longitude"   : self.longitude
                             }

    ServerManager *manager = [ServerManager sharedManager];
    [manager sendLocationToServerWithCompletion:^(BOOL success) {

        if (success)
        {
            completionHandler(UIBackgroundFetchResultNewData);
        }
        else
        {
            completionHandler(UIBackgroundFetchResultFailed);
        }

    }];
}

I just can’t understand how they all work together, whether Apple will approve it, whether it is possible and where the background image of the location is extracted.

Thanks in advance.

Answer 1

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// App delegate
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    completionHandler(UIBackgroundFetchResultNewData);
    [[YourModel singleton] pushNotificationReceived: userInfo];
}

// Model
- (void)  pushNotificationReceived:(NSDictionary *) userInfo
{
    [self registerBackgroundTaskHandler];
    get the location here, or start getting the location
    [self sendLocationToServerWithCompletionHandler: your completion handler];
}


- (void) registerBackgroundTaskHandler
{
    __block UIApplication *app = [UIApplication sharedApplication];
    self.backgroundTaskId = [app beginBackgroundTaskWithExpirationHandler:^{
        DDLogInfo(@"BACKGROUND  Background task expiration handler called");
        [app endBackgroundTask:self.backgroundTaskId];
        self.backgroundTaskId = 0;
    }];
}


- (void) endBackgroundTask
{
    if (self.backgroundTaskId)
    {
        UIApplication *app = [UIApplication sharedApplication];
        [app endBackgroundTask:self.backgroundTaskId];
        self.backgroundTaskId = 0;
    }
}

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