warning : wait_fences: failed to receive reply: 10004003

问题

I am getting this warning sometimes " wait_fences: failed to receive reply: 10004003 ", do not know why this is coming,

I do not have viewdidiappear method in my code, i have a UIAlert in my view, the code is

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Start" message:[NSString stringWithFormat:@"Hi %@,",[user objectAtIndex:0] ] delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[alert release];

回答1:

this is due to UI actions on a view controller on which you are not currently,i.e. the screen of which you are accessing UI, not visible currently.

回答2:

if you read my answer in the comment you would understand, but what you need to do is add the above code in the -viewDidAppear method and make sure you add [super viewDidAppear:YES]; and if you want to keep it in your init method you'll have to add a delay like so
[self performSelector:@selector(next) withObject:nil afterDelay:0.5];

来源：https://stackoverflow.com/questions/10892700/warning-wait-fences-failed-to-receive-reply-10004003