Weird Behavior: Message Sent to deallocated instance

Question

In my view I have a button, which is hooked to this method:

-(IBAction)showStore:(id)sender
{
    storeSinglePlayer *ssp = [[storeSinglePlayer alloc] init];
    ssp.imageH = self.imageURLH;
    ssp.imageV = self.imageURLV;
    CATransition* transition = [CATransition animation];
    transition.duration = 0.5;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush; 
    transition.subtype = kCATransitionFromTop;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
    [self.navigationController pushViewController:ssp animated:NO];
 }

When I click this button, it shows me the 'store single player' view controller. Also the 'store single player' view controller has a back button which is hooked to the following method:

-(IBAction)didPressBack:(id)sender
{
    CATransition* transition = [CATransition animation];
    transition.duration = 0.5;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionPush; 
    transition.subtype = kCATransitionFromBottom;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
    [self.navigationController popViewControllerAnimated:NO];

}

Clicking the back button also does get me back to my previous view.

But now here is the weird problem. If I repeat this 10 times, i.e. Click the button to show 'storeSinglePlayer' and then click the back button on 'storeSinglePlayer', I get the error:

[storeSinglePlayer respondsToSelector:]: message sent to deallocated instance 0xe5f6160

And, this not just only on my multiple tries, it just randomly crashes. It would work some time and some times it won't.

I have ARC enabled.

Can't get what's wrong with just this simple code. Read a lot of questions on stack overflow, but none solve my problem.

EDIT: Stack Trace

2012-08-11 11:55:56.353 Magic Buzz[2088:707] (
    0   Magic Buzz                          0x000c7e19 -[gameOverScreen showStore:] + 700
    1   CoreFoundation                      0x3769c3fd -[NSObject performSelector:withObject:withObject:] + 52
    2   UIKit                               0x30891e07 -[UIApplication sendAction:to:from:forEvent:] + 62
    3   UIKit                               0x30891dc3 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 30
    4   UIKit                               0x30891da1 -[UIControl sendAction:to:forEvent:] + 44
    5   UIKit                               0x30891b11 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 492
    6   UIKit                               0x30892449 -[UIControl touchesEnded:withEvent:] + 476
    7   UIKit                               0x3089092b -[UIWindow _sendTouchesForEvent:] + 318
    8   UIKit                               0x30890319 -[UIWindow sendEvent:] + 380
    9   UIKit                               0x30876695 -[UIApplication sendEvent:] + 356
    10  UIKit                               0x30875f3b _UIApplicationHandleEvent + 5826
    11  GraphicsServices                    0x3789222b PurpleEventCallback + 882
    12  CoreFoundation                      0x37716523 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 38
    13  CoreFoundation                      0x377164c5 __CFRunLoopDoSource1 + 140
    14  CoreFoundation                      0x37715313 __CFRunLoopRun + 1370
    15  CoreFoundation                      0x376984a5 CFRunLoopRunSpecific + 300
    16  CoreFoundation                      0x3769836d CFRunLoopRunInMode + 104
    17  GraphicsServices                    0x37891439 GSEventRunModal + 136
    18  UIKit                               0x308a4cd5 UIApplicationMain + 1080
    19  Magic Buzz                          0x000b094d main + 96
    20  Magic Buzz                          0x000b08e8 start + 40
)
2012-08-11 11:55:56.554 Magic Buzz[2088:707] *** -[storeSinglePlayer respondsToSelector:]: message sent to deallocated instance 0xf6cde30

Have you tried running with zombies? The easiest way to do that is to profile it on the simulator using the Zombies instrument. — rob mayoff
Also what's the stack trace of the “message sent to deallocated instance” error? — rob mayoff
@robmayoff: Yes I have tried running with the NSZombies. After I enabled NSZombies, I got this 'deallocated instance' message. Earlier I was getting EXC_BAD_ACCESS — mvb

Manish Agrawal Manish Agrawal · Accepted Answer · 2012-08-11T06:25:14

some asynchronous method is calling storeSinglePlayer object after it deallocated, Try removing all the delegates to nil in ViewDidUnload/ViewWillDisappear. If you sending the some query to server and without waiting for it you press the Back button then also it will crash as after completing the request it will call storeSinglePlayer object. Hope this helps

Weird Behavior: Message Sent to deallocated instance

1 Answers