Timer1.m

- (void) startTimer {
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 target:self selector:@selector(fireMe) userInfo:nil repeats:YES];
}

- (void) fireMe {
    NSLog(@"I'm fired!");
}

// By setting the repeats on YES, makes the timer execute every 0.1 sec which is 100 ms.
// By setting it to NO, will execute the timer just once.