Keep NSTimer running even application goes in background in ios

Question

I want to perform particular task in background continuously even my application goes in background.

Here is the code which i tried. Timer is firing only once when it enters in background.

- (void)applicationDidEnterBackground:(UIApplication *)application
    {
      NSTimer * timer = [NSTimer timerWithTimeInterval:2.0
                                    target:self
                                  selector:@selector(timerTicked)
                                  userInfo:nil
                                   repeats:YES];
            [[NSRunLoop mainRunLoop] addTimer:timer
                                      forMode:NSDefaultRunLoopMode];
    }

- (void) timerTicked 
{
    NSLog(@"Timer method");
}

Answer 1

- (void)applicationDidEnterBackground:(UIApplication *)application {

    UIBackgroundTaskIdentifier bgTask = UIBackgroundTaskInvalid;
    bgTask = [[UIApplication sharedApplication]
              beginBackgroundTaskWithExpirationHandler:^{
                  [[UIApplication sharedApplication] endBackgroundTask:bgTask];
              }];

   // NotificationTimer  its timer
   // myMethod1 call ur method 

    NotificationTimer = [NSTimer scheduledTimerWithTimeInterval: Interval
                                     target: self
                                   selector:@selector(myMethod1)
                                   userInfo: nil repeats:YES];

}

I think its help to u