Question

I’ve got a program in which I want to code a timer which checks wether the user is idle or not. For that I wrote following code:

    if (!idleTimer) {
      NSLog(@"make");
      idleTimer=[[NSTimer alloc]initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:10.0]interval:10 target:self selector:@selector(idleTimerExceeded) userInfo:nil repeats:NO];
      NSLog(@"madetimer with: %f, %@", idleTimer.timeInterval, idleTimer.fireDate);
}else {
      NSLog(@"no reset timer: %f", idleTimer.timeInterval);
      if (fabs([idleTimer.fireDate timeIntervalSinceNow]) < 9) {
         NSLog(@"reset");
         [idleTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:10]];
    }
}

But somehow my logs show that the interval is always 0.0000 . Which means that something is wrong here. Can anybody help me?

Answer 1

ive never seen a timer look so complicated. try this:

write a method that checks if the user is idle (lets say idleChecker)

then make the timer repeatable and calls that method idleChecker

[NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:@selector(idleChecker) userInfo:nil repeats:YES];

remember to declare the idleChecker method in the .h file

take note if u want to stop the timer event then you need to maintain a reference to it

NSTimer aTimer = [NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:@selector(idleChecker) userInfo:nil repeats:YES];

then to stop it

[aTimer invalidate];

as for checking if its running i would just stick a nslog message in there stating something like “check for idle user”