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POHow would I make my timer run in the background and then send a local notification?
 

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  1. POHow would I make my timer run in the background and then send a local notification?
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    <p>For some reason my timer only runs in the foreground. I've searched here for solutions but I couldn't find any good ones. My timer uses Core Data and my timeInterval is saved after every decrement. Also, I'm sending a UILocalNotification but that doesn't work. I'm assuming it doesn't send a alert view if its in the foreground..Well this is what I have now:</p> <pre><code>-(IBAction)startTimer:(id)sender{ if (timer == nil) { [startButton setTitle:@"Pause" forState:UIControlStateNormal]; timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerAction:) userInfo:nil repeats:YES]; } else { [startButton setTitle:@"Resume" forState:UIControlStateNormal]; [timer invalidate]; timer = nil; } } -(void)timerAction:(NSTimer *)t { if(testTask.timeInterval == 0) { if (self.timer) { [self timerExpired]; [self.timer invalidate]; self.timer = nil; } } else { testTask.timeInterval--; NSError *error; if (![self.context save:&amp;error]) { NSLog(@"couldn't save: %@", [error localizedDescription]); } } NSUInteger seconds = (NSUInteger)round(testTask.timeInterval); NSString *string = [NSString stringWithFormat:@"%02u:%02u:%02u", seconds / 3600, (seconds / 60) % 60, seconds % 60]; timerLabel.text = string; NSLog(@"%f", testTask.timeInterval); } -(void)timerExpired{ UILocalNotification* localNotification = [[UILocalNotification alloc] init]; localNotification.alertBody = @"Time is up"; localNotification.alertAction = @"Ok"; localNotification.timeZone = [NSTimeZone defaultTimeZone]; [[UIApplication sharedApplication]presentLocalNotificationNow:localNotification]; } </code></pre> <p>I would really appreciate some guidance to making my timer work in the background (just like Apple's timer). I'm not sure how I would use NSDateComponents since I also need the testTask.timeInterval to be updated even when the application in the background..</p>
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    1. COpossible duplicate of [Problem in Background Thread in iPhone](http://stackoverflow.com/questions/7187967/problem-in-background-thread-in-iphone); see also [Problem while working in background and nstimer](http://stackoverflow.com/q/7190919)
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      1. POHow would I make my timer run in the background and then send a local notification?
      1. USJosh Caswell
    2. COYou can't make the timer run while your app is backgrounded. If you're trying to display a countdown, you need to save the time when your app goes into the background and use that when you redisplay on becoming active again. There's multiple posts on this issue on SO.
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      1. POHow would I make my timer run in the background and then send a local notification?
      1. USJosh Caswell
    3. COdid you tried that? `[[UIApplication sharedApplication] performSelector:@selector(presentLocalNotificationNow:) withObject:localNotification afterDelay:1.0];` where 1.0 is the time in seconds you want to wait.
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      1. POHow would I make my timer run in the background and then send a local notification?
      1. USlucaslt89
 

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