deselectRowAtIndexPath: failing in iOS5

Question

The following works fine in iOS 4.3 but throws a EXC_BAD_ACCESS in iOS5.

if(mainTable != nil){
    [mainTable deselectRowAtIndexPath:currentIndexPath animated:YES];

mainTable is of type UITableView. It fails on the row with deselectRowAtIndexPath:. The above exception occurs when leaving the main (first) table view. The steps are: Click a row from main table view. Another table view displays. Click top left button to go back to the main table and exception occurs.

Actually, by the time

 - (void)viewDidDisappear:(BOOL)animated

is hit via breakpoint, currentIndexPath is already released in iOS5.

What can I look for here? I know iOS5 does some different things with releasing objects. Perhaps there are some additional checks I can do but I'm not sure where to start.

EDIT: It is defined as

currentCellIndex = indexPath;

and comes from

-(void) displaySubView:(UITableView *)tableView indexPath:(NSIndexPath *)indexPath

I do have zombies enabled in the Run part of my scheme and now get the details. When I hit the above line, I see in the console:

*** -[NSIndexPath isEqual:]: message sent to deallocated instance 0x85a2010

Why does that happen in iOS5 and not in iOS 4.3? I do have a breakpoint in the dealloc on currentIndexPath and it is never hit.

I'm starting to believe this is related to ARC. I still have lots of retains/releases. I don't want to do the auto format for ARC since that is to cause more problems. I did try the flag used to disable ARC on a per file basis. That just threw a compiler error with unknown command.

One place to start would be to enable zombies: http://stackoverflow.com/questions/5386160/how-to-enable-nszombie-on-xcode-4 — bryanmac, Oct 19 '11 at 05:40
better link: http://stackoverflow.com/questions/2190227/how-do-i-set-nszombieenabled-in-xcode-4 — bryanmac, Oct 19 '11 at 05:51
http://stackoverflow.com/questions/4848137/debugging-over-released-objects-problem-with-nszombie/4848483#4848483 — bryanmac, Oct 19 '11 at 23:41

score 3 · Accepted Answer · answered Oct 20 '11 at 07:40

3

This is not an exact answer to your question, but you might want to consider deselecting your row in viewWillAppear:

-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [mainTable deselectRowAtIndexPath:[mainTable indexPathForSelectedRow] animated:YES];
}

You need to implement this in the 'parent' view controller, where mainTable is declared.

Regarding your actual question, can you tell us how does your @property look for currentCellIndex?

answered Oct 20 '11 at 07:40

phi

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I will try what you mentioned but unfortunately, this error is blocking: http://stackoverflow.com/questions/7836849/xcode-looking-in-wrong-folder. This project has really gone south with iOS5. – 4thSpace Oct 21 '11 at 02:30

deselectRowAtIndexPath: failing in iOS5

1 Answers1