How to release NSTimer? or stop timer. Xcode 5

Question

After the end of our game the NSTimer does not stop.

-(void)StartGame{
Countdown = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(TimeDecrease) userInfo:nil repeats:YES];
}

-(void)TimeDecrease{
    StartTime = StartTime - 1;
    Timer.text = [NSString stringWithFormat:@"%d",StartTime];
    if(StartTime == 0){
        [self EndGame];
    }
}

We tried [Countdown release] and disabled ARC but it throws an error. We are trying to accomplish a timer that resets to 15 at the beginning of every new game.

Answer 1

Try:

[Countdown invalidate];
Countdown = nil;