Question

I’m making an app that has a view with UITableView with UISearchDisplayController. Data comes from NSFetchedResultsController. All is working fine: I get the data, table view is being populated, search works great. The only problem is that if I search and then click on “Cancel”(without deleting the text from the UISearchBar) and then go back to previous view controller and then go to that same view with UITableView and UISearchDisplayController it crashes with this being written to the log:

2012-01-06 16:46:37.559 MyApp[9586:207] *** -[SomeRandomViewController
controllerWillChangeContent:]: message sent to deallocated instance
0x778d060

I’ve googled and stackoverflowed for that error, tried to release NSFetchedResultsController variable, did set it and its’ delegate to nil, but nothing helps.

And if I do some search, then delete the text from the search bar and then tap on “Back” and go back to that view it works just fine.

A bit of the code:

- (void)viewDidUnload {
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

  self.fetchedResultsController = nil;
  self.searchFetchedRC = nil;
  [super viewDidUnload];
}

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller {

  self.fetchedResultsController = nil;
  [self fetchedResultsController];
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
  self.searchDisplayController.searchBar.text = @"";
  self.searchDisplayController.active = NO;
  [self searchDisplayControllerWillEndSearch:self.searchDisplayController];
  return YES;
}

Any help will be appreciated

Update

Without zombies the output to the log is:

2012-01-09 09:25:48.128 Butane[17325:207]
-[UITextMagnifierTimeWeightedPoint controllerWillChangeContent:]: unrecognized selector sent to instance 0x8251dc0

Update 2

Dealloc method:

- (void)dealloc {
  [self.mySearchDisplayController release];
  self.mySearchDisplayController.delegate = nil;
  self.mySearchDisplayController = nil;
  [self.fetchedResultsController release];
  self.fetchedResultsController.delegate = nil;
  self.fetchedResultsController = nil;
  [self.searchFetchedRC release];
  self.searchFetchedRC.delegate = nil;
  self.searchFetchedRC = nil;
  [self.tableView release];
  [textView release];
  self.tableView = nil;
  self.tableView.delegate = nil;
  [super dealloc];
}

mySearchDisplayController = UISearchDisplayController

fetchedResultsController and searchFetchedRC = NSFetchedResultsControllers

tableView = UITableView

textView = [HPGrowingTextView][1]

Update 3

Inspired by the answer of Tia I’ve set FRCs and their delegates to nil in searchDisplayControllerWillEndSearch method. Works so far so good

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller {

  self.fetchedResultsController.delegate = nil;
  self.fetchedResultsController = nil;
  self.searchFetchedRC.delegate = nil;
  self.searchFetchedRC = nil;
  [self fetchedResultsController];
}

Answer 1

- (void)dealloc {
  //[self.mySearchDisplayController release];
  self.mySearchDisplayController.delegate = nil;
  self.mySearchDisplayController = nil;
  //[self.fetchedResultsController release];
  self.fetchedResultsController.delegate = nil;
  self.fetchedResultsController = nil;
  //[self.searchFetchedRC release];
  self.searchFetchedRC.delegate = nil;
  self.searchFetchedRC = nil;
  //[self.tableView release];
  [textView release];
  self.tableView.delegate = nil;
  self.tableView = nil;
  [super dealloc];
}

You are over-releasing your properties, as setting it to nil already release it for retained properties. I tried to remove extra releasing code by commenting them out, so please try to replace your dealloc with my code above and see.