iOS Unable to push views to navigation controller

[blueeye]

Hi all,

I'm trying to create an application (navigation based, I might add) which loads different xml data in different views.
The RootViewController loads without problems, but when I select a row I get a variety of errors.
There are two options: "By Room" and "See All". If I select the first option, it loads the RoomMenuController, and the second loads the EveryoneController.

On selecting "By Room" I get the following error:

2009-09-28 13:01:43.901 Assisted Living 2.0[3838:207] *** -[UITouchData setParentViewController:]: unrecognized selector sent to instance 0x382b6a0
2009-09-28 13:01:43.902 Assisted Living 2.0[3838:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UITouchData setParentViewController:]: unrecognized selector sent to instance 0x382b6a0'
2009-09-28 13:01:43.904 Assisted Living 2.0[3838:207] Stack: (
    29291611,
    2523598665,
    29673531,
    29242998,
    29095618,
    3282295,
    3260859,
    11550,
    3037850,
    3021016,
    274874,
    29076160,
    29072456,
    37377965,
    37378162,
    2764803,
    8640,
    8494
)

I have no idea how to interpret the stack and I don't know why the problem is caused. I've set breakpoints in the viewDidLoad methods of all the ViewControllers but these methods are never called, so I don't think the problem is in the ViewControllers.

On selecting the second options I get an EXC_BAD_ACCESS signal which I assume means that it is trying to load something that has already been released. I don't know why this is, however.

I'm loading my ViewControllers in the following manner:

views = [[NSMutableArray array] init];
	[views addObject:[[[RoomMenuController alloc] initWithNibName:@"RoomMenu" bundle:[NSBundle mainBundle]] retain]];
	[views addObject:[[[EveryoneController alloc] initWithNibName:@"Everyone" bundle:[NSBundle mainBundle]] retain]];
	[views addObject:[[[PeopleByRoomController alloc] initWithNibName:@"PeopleByRoom" bundle:[NSBundle mainBundle]] retain]];

(that's from the viewDidLoad method of RootViewController.m)

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
	NSLog(@"navigationController=%@", [self navigationController]);
	NSLog(@"	before push: stack=%@", [[self navigationController] viewControllers]);
	NSLog(@"	pushing: %@", [views objectAtIndex:indexPath.row]);
	UIViewController *ctrl = [views objectAtIndex:indexPath.row];
	[[self navigationController] pushViewController:ctrl animated:YES];
	[ctrl release];
	NSLog(@"	after push : stack=%@", [[self navigationController] viewControllers]);
}

Any help with this would be much appreciated because I'm stumped but that's probably because I've only been doing this for a few days.

 

[blueeye]

The first error has now changed (for some unknown reason) to also be an EXC_BAD_ACCESS signal.

 

[blueeye]

I solved the problem by using class properties instead of objects in an array. I'm curious as to why the first method did not work, however, because I don't see why it shouldn't (and I've seen it used in tutorials).

 

[dejo]

I'm curious as to why the first method did not work...

The EXC_BAD_ACCESS is caused by this line:

[ctrl release];

You don't want to release the controller at this point.

 

[jnic]

views = [[NSMutableArray array] init];

Had you meant to write:

views = [[NSMutableArray [COLOR="Red"]alloc[/COLOR]] init];

?

 

[blueeye]

The EXC_BAD_ACCESS is caused by this line:

[ctrl release];

You don't want to release the controller at this point.

I had it without this before and it did the same thing. The controller can be released because it has been copied already, no?

@jnic: no I hadn't, but maybe I should have done. I suppose that it's possible that the views had released themselves automatically... I really should have allocated it or used retain.