Iphone EXC_BAD_ACCESS with NSMutableArray

Question

So, I have a UIViewTable and a UISearchBar with two zoom buttons. The idea is that when I click the area button, the data source for the UIViewTable changes, but I get an EXC_BAD_ACCESS error.

I have the following code in the UIViewController SearchViewController.m:

- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange: (NSInteger) selected scope
{
    MyAppDelegate *delegate = (MyAppDelegate *) [[UIApplicationsharedApplication] delegate];
    if (self.listData != nil) {
        [self.listData release];
    }
    if (selectedScope == 0) {
        self.listData = [delegate.data getListOne];
    }
    else {
        self.listData = [delegate.data getListTwo];
    }
}

- (void) viewDidLoad {
    MyAppDelegate *delegate = (MyAppDelegate*) [[UIApplication sharedApplication] delegate];
    self.listData = [delegate.data getListOne];

    //some other unrelated code
}

in my SearchViewController.h I have:

@property (nonatomic,retain) NSMutableArray *listData;

in my data. I have:

-(NSMutableArray *) getListOne {
     NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:@"test1",
                                                                    @"test2",
                                                                    nil];
     [list autorelease];
     return list;
}

-(NSMutableArray *) getListTwo {
     NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:@"test3",
                                                                    @"test4",
                                                                    nil];
     [list autorelease];
     return list;
}

Failure:

self.listData = [delegate.data getListTwo];

I checked it when I set the property with which it falls. I understand that when I create a new NSMutableArray in Data.m, I assign it auto-advertisement, as it should.

When the view loads, I assign it to my listData, and as I access the saved property, the reference count is incremented (so there are now 2 auto-pending it).

, , , listData ( ), , NSMutableArray 0 ( , ).

NSMutableArray ... ? : (

oh NSMutableArray, tableView - , if, , ?? / , , :)

Answer 1

:

if (self.listData !=nil)
{
    [self.listData release];
}

- , listData retain, release . :

- (void) setListData:(NSMutableArray *)listData
{
    [listData retain];
    [self->listData release];
    self->listData = listData;
}

: , . , : , , . , nil, , Objective-C nil, .

, , , , , - . , , , , , EXC_BAD_ACCESS.