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[smasher]

The "selector:" parameters expects a selector, which you need to get with the "@selector" directive. Try this:

timer = [NSTimer scheduledTimerWithTimeInterval:1.0
     target:self
     selector:@selector(countDown)  // I added @selector() here
     userInfo:nil repeats:YES];

Also, you want "if (time == 0)" not "if (timer == 0)" . You want to check your counter, not the timer object.