UIButton with NSInvocation

Question

I am trying to add a button programatically in a way that upon pressing it, a certain object is being passed. I keep on getting "unrecognized selector sent" exception. Can you suggest whats wrong with the code:

    // allocate the details button's action
    SEL selector = @selector(showPropertyDetails:forProperty:);
    NSMethodSignature *signature = [[self class] instanceMethodSignatureForSelector:selector];
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
    [invocation setSelector:selector];
    //The invocation object must retain its arguments
    [property retain];      
    //Set the arguments
    [invocation setTarget:self];
    [invocation setArgument:&property atIndex:3];       
    [(UIButton*)[myView viewWithTag:15] addTarget:self action:@selector(selector) forControlEvents:UIControlEventTouchDown];

and further down, the method in the same class looks like:

-(void) showPropertyDetails:(id)something forProperty:(Property *)property {
int i=0;
}

Answer 1

While you build a NSInvocation, you are not using it anywhere - you are just setting the selector as the action for the button. This selector is expected to have a form like - (void)foo:(id)sender, ....

You could instead use a dictionary with e.g. the tag as a key that maps to a certain NSInvocation or stores additional arguments.