Question

I have a page with a back button that takes me to an inbox. I do this in viewWillDisappear –

-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
    [inboxToolbar removeFromSuperview ];
[inboxToolbar release];

}

If I do this a few times, the app crashes and the exception thrown is “unrecognized selector sent to instance”. This happens very intermittently. Any thoughts on how to go about fixing / debugging it?

Answer 1

Assuming the crash is accessing your inboxToolbar ivar, change your code to the following:

-(void)viewWillDisappear:(BOOL)animated
{
   [super viewWillDisappear:animated];
   [inboxToolbar removeFromSuperview ];
   [inboxToolbar release];
   inboxToolbar = nil;
}

This will ensure inboxToolbar does not keep a pointer to a deallocated object. You could also have other issues, would need to see the crash log and more of your code to be sure.