Question

I am having problems with stoping NSTimer started on button click. [timer invalidate] and timer = nil; just do nothing neither when I am trying to stop it viewWillDisappear nor in method invoked by method which is being invoked by this timer. However when I start my timer in viewWillAppear and invalidate it in viewWillDisappear everything is fine.

I suppose there might be an issue in thread I am starting the timer from. Can you help with that?

I looked through all answers here regarding NSTimer not stopping, but they didn’t help to solve the problem.

The way I initialize my timer:

timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(oneSecondPassedSinceRoundStarted) userInfo:nil repeats:YES];  

The ways I tried to stop it:

[self.timer invalidate];
[timer invalidate];

Answer 1

It’s funny how quick you can answer your own question after you asked for a help. No matter how long you have been struggling to find the answer before by yourself:

[self performSelectorOnMainThread:@selector(stopTimer) withObject:nil waitUntilDone:YES];

And the selector:

- (void) stopTimer
{
    [timer invalidate];
    timer = nil;
}