NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' when presenting view controller

Question

I have developed an app that in testing has worked fine but when it has could live I have had some issues with crashes when presenting Modal View Controllers. The issue is in here some where:

NSLog(@"Looks like we made it here 1");

UIViewController *mtaViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"mtaViewController"];
NSLog(@"Looks like we made it here 2");

[mtaViewController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
NSLog(@"Looks like we made it here 3");

[self presentModalViewController:mtaViewController animated:YES]; 
NSLog(@"Looks like we made it here 4");

and my output to the console is:

2012-06-14 09:26:24.161 appname[2013:707] Looks like we made it here 1
2012-06-14 09:26:24.165 appname[2013:707] Looks like we made it here 2
2012-06-14 09:26:24.166 appname[2013:707] Looks like we made it here 3
2012-06-14 09:26:28.866 appname[2013:707] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
*** First throw call stack:
(0x343ac8bf 0x345fc1e5 0x342f5b6b 0x6d3fd 0x6e719 0x3778e7ff 0x37798d53 0x37798cc1 0x37838339 0x3783714f 0x37891d97 0x7ce1d 0x7cd47 0x3788eaa5 0x3776a81b 0x3776ffb9 0x34ec1ba7 0x36fe0e8d 0x3437f2dd 0x343024dd 0x343023a5 0x30b86fcd 0x37783743 0x84327 0x6b468)
terminate called throwing an exception

I have set up in a function that I call when wanting to change view controllers and as you can see it makes it all the way down to "Looks like we made it here 3" so I suspect that there is an issue with line

[self presentModalViewController:mtaViewController animated:YES];

Can anyone help?

Answer 1

Are you sure you view controller really gets initialized? Just an idea but this line

[mtaViewController setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];

would do nothing if mtaViewController would be nil. In Cocoa you can send messages to nil without problems. Your app only will crash later when you try to do something specific with them. Does

NSLog(@"%@", mtaViewController);

tell you something useful? Please make also sure you connected everything in IB that has to be connected (if you aren't working everything out in raw code).

By the way. This is deprecated. Use

presentViewController:animated:completion:

instead.

Answer 2

Check any array in mtaViewController, I dont see any array in your code so I'm thinking the issue is within mtaViewController. :)