PopoverController - deallocated instance - objective-c

Question

when I click the popover button in my splitviewcontroller, I receive the message: message sent to deallocated instance 0x6a66ca0
I already found out that this instance has to be the detailviewcontroller I allocate and init. So far so good. But I don't see the problem while the whole thing is not working.
First of all the AppDelegate where I create the Splitview:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// TestViews for SplitViewController
// TestView1 *test1 = [[TestView1 alloc] initWithNibName:#"TestView1" bundle:nil];
// TableView as RootViewController for the Left Hand Pane
RootViewTableViewController *rootViewTableViewController = [[RootViewTableViewController alloc] initWithNibName:#"RootViewTableView" bundle:nil];
UINavigationController *rootNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewTableViewController];
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailView" bundle:nil];
UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
self.splitViewController = [[UISplitViewController alloc] init];
self.splitViewController.delegate = detailViewController;
self.splitViewController.viewControllers = [NSArray arrayWithObjects:rootNavigationController,detailNavigationController, nil];
self.window.rootViewController = self.splitViewController;
[self.window makeKeyAndVisible];
return YES;
}
First I was thinking the code line self.splitviewcontroller.delegate = detailviewcontroller; could be the problem..... but the whole app starts up perfectly. only when i click the button this prob appears.
the RootViewController is this ( I omitted the standard tableview delegate methods for clarity)
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Set Title of the TableView for the RootViewController
self.title = #"Notarzteinsatzprotokoll";
self.clearsSelectionOnViewWillAppear = NO;
self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
}
NSLog(#"INIT %p", self);
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionMiddle];
}
and the detail view controller:
#pragma mark -
#pragma mark Managing the Detail Item
- (void)setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view
[self configureView];
}
if (self.rootPopoverController != nil) {
[self.rootPopoverController dismissPopoverAnimated:YES];
}
}
- (void)configureView
{
// Update the user interface for the detail item
if (self.detailItem) {
self.detailDescriptionLabel.text = [self.detailItem description];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
[self setTitle:#"Notarzteinsatzprotokoll"];
[self configureView];
}
#pragma mark -
#pragma mark Rotation Support
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
return YES;
}
#pragma mark -
#pragma mark SplitView
- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc {
barButtonItem.title = #"Master";
[self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
self.rootPopoverController = pc;
}
- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {
[self.navigationItem setLeftBarButtonItem:nil animated:YES];
self.rootPopoverController = nil;
}
I don't see the point the program flow where the detailviewcontroller objects is released and something else tries to send a message... do I have to interchange some code lines?
Thank you!
Sebastian
#end

Answer 1

the error should tell you what message is being sent to a deallocated instance. Not sure exactly what the issue is, is it a setTitle: message being sent to the left bar button item?
In splitViewController:willShowViewController: you set the left bar button item to nil (which will dealloc it) and in splitViewController:willHideViewController: you attempt to changed its title, which could be your problem.