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POiOS app Stopwatch and Timer stop counting when in background
 

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    <p>I have an iPhone app which is basically a clock, stopwatch, and timer. Everything works fine, until you leave the app, and the stopwatch and timer stop counting. I think the way to solve this would be to start a counter when the app is put into the background, and add/subtract that from the stopwatch/timer when the app starts up again. Is this the best thing to do, and if so, how would I do this?</p> <p><strong>UPDATE</strong>: The timer, stopwatch, and clock are all in different view controllers. Here is the code for my stopwatch in StopwatchViewController.m:</p> <pre><code>- (void)stopwatch // Start counting the stopwatch { hourInt = [hourLabel.text intValue]; // Store integer values of time minuteInt = [minuteLabel.text intValue]; secondInt = [secondLabel.text intValue]; if (secondInt == 59) { // Add on one second secondInt = 0; if (minuteInt == 59) { minuteInt = 0; if (hourInt == 23) { hourInt = 0; } else { hourInt += 1; } } else { minuteInt += 1; } } else { secondInt += 1; } NSString *hourString = [NSString stringWithFormat:@"%02d", hourInt]; // Update text to show time NSString *minuteString = [NSString stringWithFormat:@"%02d", minuteInt]; NSString *secondString = [NSString stringWithFormat:@"%02d", secondInt]; hourLabel.text = hourString; minuteLabel.text = minuteString; secondLabel.text = secondString; [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(stopwatch) userInfo:nil repeats:NO]; // Repeat every second } </code></pre> <p>How do I get it to add on the elapsed time the app was in the background?</p>
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