CODEWITHSUNDEEP
iosobjective-cnstimer
HurkNburkS
HurkNburkS

Reputation: 5510

How to check if device is on every hour using

I am trying to figure out how to initiate a method call ever hour while my app is running.

I have created the following method which is started once the ViewController is loaded but the problem is, is that it runs once but then never again..

This is what my code looks like.

#define kMaxAliveTimeSeconds 5.0

// currently only running the query every 5 seconds for testing
- (void)deviceTimer {
    if (!isAliveTimer) {
        isAliveTimer = [NSTimer scheduledTimerWithTimeInterval:kMaxAliveTimeSeconds
                                                     target:self
                                                   selector:@selector(deviceIsAlive)
                                                   userInfo:nil
                                                    repeats:NO];
    }
    else {
        if (fabs([isAliveTimer.fireDate timeIntervalSinceNow]) < kMaxAliveTimeSeconds-0.5) {
            [isAliveTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:kMaxAliveTimeSeconds]];
        }
    }
}

- (void)deviceIsAlive {
 // do stuff here
}

the only thing is deviceIsAlive is called once but then never again.

Upvotes: 0

Views: 52

Answers (1)

guenis
guenis

Reputation: 2538

Either set repeats:YES in the timer allocation statement (so it repeats automatically, otherwise nstimer invalidates itself after the first time) or in your deviceIsAlive function allocate a new timer.

Upvotes: 2

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