Why does this code crash in iOS 5.1 but not iOS 6?

Question

This code is called from inside my Navigation views inside my Settings tab. It crashes on the last line in iOS 5.1 but NOT iOS 6. Why?

else if (indexPath.section == 0 && [[settingsArray objectAtIndex:indexPath.row] isEqualToString:@"Unlock Premium Features"]) { InAppViewController *inappController = [[InAppViewController alloc] initWithNibName:@"InAppViewController" bundle:nil]; inappController.titleString = @"Upgrade to Pro."; EditNavController *navController = [[EditNavController alloc] initWithRootViewController:inappController]; [self.navigationController presentModalViewController:navController animated:NO]; }

It crashes on:

[self.navigationController presentModalViewController:navController animated:NO];

Here is the crash:

*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstraint'

Are you sure it's not the other way around? 'presentModalViewController' is deprecated in iOS 6. It can be replaced by presentViewController:animated:completion. (stackoverflow.com/questions/12507455/…) — leanne
– leanne, Commented May 13, 2013 at 19:25
@leanne, 'deprecated' doesn't mean 'broken' - it means 'we're gonna break it in the next release' ;-j — foundry
– foundry, Commented May 13, 2013 at 21:26

Glorfindel · Accepted Answer · 2021-08-18 15:55:03Z

13

if you are using autolayout (if you created a new nib its on by default) in the view being presented, it will crash because auto layouts were only introduced in ios 6.
_{(source: raywenderlich.com)}