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POmultiple alert views being sent crashes the application
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copied!<p>I'm trying to send 2 alert views to the main thread but if the first alert view has not been dismissed and the second shows up, the application crashes. how would i avoid this?</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; self.date1 = [NSDate dateWithTimeInterval:[testTask timeInterval] sinceDate:[NSDate date]]; timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerAction:) userInfo:nil repeats:YES]; [timer fire]; } -(void)timerAction:(NSTimer *)t{ NSDate *now = [NSDate date]; NSDateComponents *components = [gregorianCalendar components:NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:now toDate:self.date1 options:0]; NSString *timeRemaining = nil; if([now compare:self.date1] == NSOrderedAscending){ timeRemaining = [NSString stringWithFormat:@"%02d:%02d:%02d", [components hour], [components minute], [components second]]; NSLog(@"works %@", timeRemaining); } else { timeRemaining = [NSString stringWithFormat:@"00:00:00"]; [self.timer invalidate]; self.timer = nil; UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:[testTask taskName] message:@"Time is up!" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil]; [alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES]; NSLog(@"ended"); } timerLabel.text = timeRemaining; [timerLabel setNeedsDisplay]; [self.view setNeedsDisplay]; } </code></pre>

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