title: How to make my application run in background?
body: <p>I am developing an alarm application. I use NSTimer in my application. The timer works just fine. But when I minimize the application, the timer stops working. How to make it work while the application is closed or minimized?</p>
  
  <p>Here is my code  </p>
  
  <pre><code>- (void) alarmSaveButtonAction:(id)sender {
  
  
  timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self
                                         selector:@selector(onTimerEvent)
                                         userInfo:nil repeats:YES];  
  }
  -(void)onTimerEvent
  {
      NSLog(@"saravanan");
      NSDate *now = [NSDate new]; 
  
      NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
      dateFormatter.dateFormat = @"hh:mm:ss a";
      [dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
      NSLog(@"The Current Time is %@",[dateFormatter stringFromDate:now]);
      NSString *string2 = [NSString stringWithFormat:[dateFormatter stringFromDate:now]];
      NSLog(@"currenttime %@", string2);
      [dateFormatter release];
  
  
      Resource *resourceLoader = [[Resource alloc] init];
  
      NSDictionary *prefDic = [resourceLoader getPlistDataAsDictionary:@"preference"];
  
      NSDate *selectedDateTime = [[NSDate alloc]init];
  
      selectedDateTime = [prefDic objectForKey:@"alarmtime"];
  
      NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc] init];
      dateFormatter1.dateFormat = @"hh:mm:ss a";
      [dateFormatter1 setTimeZone:[NSTimeZone systemTimeZone]];
      NSLog(@"saravanan date %@",[dateFormatter1 stringFromDate:selectedDateTime]);
      NSString *string1 = [NSString stringWithFormat:[dateFormatter1 stringFromDate:selectedDateTime]];
      NSLog(@"currenttime %@", string1);
      [dateFormatter1 release];
  
  
      if ([string1 isEqualToString:string2]) 
      {
          NSLog(@"alarm scheduld");
          [self scheduledNotification];
          [timer invalidate];
          timer = nil;
      }
  }
  </code></pre>
  
  <p>Thanks in advance.</p>