How do I create a NSTimer on a background thread?
If you need this so timers still run when you scroll your views (or maps), you need to schedule them on different run loop mode. Replace your current timer: [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; With this one: NSTimer *timer = [NSTimer timerWithTimeInterval:0.5 target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; For details, check this … Read more