NSTimer Not Stopping When Invalidated

Question

I have the following code in my .h file:

#import 
#import 
#import 

        

Answer 1

You need to call [self.messageTimer invalidate] on the same thread on which you created the timer. Just make sure that the timer is created and invalidated on main thread.

dispatch_async(dispatch_get_main_queue(), ^{
    if ([UserType isEqualToString:@"Owner"]) {
        [self.messageTimer invalidate];
        self.messageTimer = nil;
    } else {
        self.messageTimer = [NSTimer scheduledTimerWithTimeInterval:10.0
                                                             target:self
                                                           selector:@selector(checkForMessages)
                                                           userInfo:nil
                                                            repeats:YES];
    }
});