Background Fetch and Local Notification

Question

In my app, I am planning to use Local Notification and not Push Notifications. I need to check whether a transaction update is available, if YES, just notify the user with Local Notification. I have done the below steps.

1. In didFinishLaunchingWithOptions, set fetch interval [[UIApplication sharedApplication]setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum].
2. -(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {

> Added code for POST Request as below with my request data:

NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

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

3. After response parsing, comparing if any update is there and if any update is there, notification is displayed using the below code.

   UILocalNotification* localNotification = [[UILocalNotification alloc] init]; localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:1];
   localNotification.timeZone = [NSTimeZone defaultTimeZone];
   localNotification.alertTitle = @"SIB Mirror";
   localNotification.alertBody = @"You have a new transaction. Go to e-Statements to view it.";
   localNotification.timeZone = [NSTimeZone defaultTimeZone];
   [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
   

The issue is most of the times, when phone is locked, getting error message >Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost."

and hence notification was not getting displayed. But when I connect Phone directly to Phone and in debug mode enable background sync, every thing works properly.

Kindly guide me an easy approach to do this or correct me if anything I am doing wrongly.

Thanks,

Mobile Developer.

Answer 1

Try the below code:

NSURLResponse * response = nil;
            NSError * error = nil;
            NSData * data = [NSURLConnection sendSynchronousRequest:request
                                                  returningResponse:&response
                                                              error:&error];

if (error == nil)
{
 // Parse data here
  completionHandler(UIBackgroundFetchResultNewData);
}
else {
  completionHandler(UIBackgroundFetchResultFailed);

}