EXC_BAD_ACCESS with IBACTION

Question

I have read a lot about this issue but mine still seems to be different somehow. So from what I understood, EXC_BAD_ACCESS occurs with memory management problems. The thing is, mine does not seem (! :)) to be there. The thing is, I simple added a button in IB, rounded rect, no image. The I hooked it up with an IBACTION I defined in my class. This method does nothing (!) by the way. Anyway, as soon as I click the button, the App crashes, with "EXC_BAD_ACCESS". I am surely not overreleasing anything, as far as I can see, that is. What is wrong there? Any clues? This is my console log: ``` Loading program into debugger… sharedlibrary apply-load-rules all Program loaded. target remote-mobile /tmp/.XcodeGDBRemote-148-79 Switching to remote-macosx protocol mem 0x1000 0x3fffffff cache mem 0x40000000 0xffffffff none mem 0x00000000 0x0fff none run Running… [Switching to thread 11779] [Switching to thread 11779] (gdb) continue 2010-01-15 09:16:34.800 FlightControl1[1899:207] Table loaded 2010-0…

Accepted Answer

I was tortured by this for a few hours as well. It turned out to be a memory problem as expected. The controller acting as the target for the button was deallocated. It was the root controller of a navigation controller whose view was added directly to the window. My code looked like this:

```
MyController *myController = [[MyController new] autorelease];
UINavigationController* navController = 
    [[[UINavigationController alloc] initWithRootViewController:myController] autorelease];
[window addSubview:navController.view];
```

My assumption was that `myController` would be retained when it's passed as the root controller of the `UINavigationController`, but that turned out to be wrong. The solution was to assign the controller to a local variable and release it in `dealloc`. The interface of the object containing the above code should have:

```
...
@property (retain, nonatomic) MyController *myController;
...
```

And the implementation:

```
self.myController = [[MyController new] autorelease];
UINavigationController* navController = 
    [[[UINavigationController alloc] initWithRootViewController:myController] autorelease];
[window addSubview:navController.view];

...

- (void)dealloc {
    [self.myController release];
    ...
    [super dealloc];
}
```

EXC_BAD_ACCESS with IBACTION

Solution

Problem