Question

I am trying to subclass UIBarButtonItem to add some special functionality. I need the barButtonItem to toggle its appearance when touched, and am therefore attempting to override performSelector:.

When I use the code below, I get an EXC_BAD_ACCESS (code=2 ...)

-(id)performSelector:(SEL)aSelector withObject:(id)object1 withObject:(id)object2
{
    // Do something

    return [super performSelector:aSelector withObject:object1 withObject:object2];
}

My guess is that I am either wrongly attempting to override performSelector: (is there another way?) or incorrectly calling the method on super.

After searching for a solution for 3+ hours I have found nothing. Any help is greatly appreciated.

Update:
The following works:

@implementation CustomBarButtonItem

- (void)setTarget:(id)target
{
    _realTarget = target;
    super.target = self;
}

- (void)setAction:(SEL)action
{
    _realAction = action;
    super.action = @selector(pressed);
}

- (void)pressed
{
    [self doCustom]; // implement this somewhere
    [_realTarget performSelector:_realAction withObject:nil afterDelay:0];
}

Unfortunately I wanted to toggle between having a customView and the normal UIBarButtonItem look by setting self.customView = nil which only works sometimes. But that is a-whole-nother question. Thanks all.

I will wait a little longer to choose a best answer to see if there are better solutions.

Answer 1

Probably better to implement this functionality using a simple UIView that you can simply modify in any given way.

UIBarButtonItem does provide a way for initializing based on a custom UIView:

- (id)initWithCustomView:(UIView *)customView

You could then tell the UIView to change its appearance based on the touch events fired by the UIBarButtonItem.