selector adding parameters

Question

What I want to do is basically send some form of id with my button so I can calculate which one has been clicked. My buttons get dynamically created and all of them execute the same function that loads a new view, I want to know which button was clicked so I can display the correct data on the new view.

I have an NSMutableArray of annotations that I add a button to the details of the pin. The button works and it loads the next view, but I want to figure out which button was pressed.

I use a singleton with an NSMutableArray called array. The singleton name is Helper

What I did was:

Helper* array = [Helper sharedManager];
int clickedNum = [array.array indexOfObject:annotation];
[myDetailButton setTag:clickedNum];
[myDetailButton addTarget:self action:@selector(moreInfo:event:) forControlEvents:UIControlEventTouchUpInside];

That is where i create the annotations that go unto the map. The next line is my function ID

- (IBAction)moreInfo:(UIButton*)sender

And this is where I want to retrieve the tag

Helper *array = [Helper sharedManager];
array.clicked = sender.tag;

When I run this and click on the button in one of my annotations I get an exception saying NSInvalidArgumentException, reason: -(MapViewController moreInfo:event:]

Any help would be appriciated

Edit:

As requested the interface for helper:

@interface Helper : NSObject {
    NSMutableArray *array;
    int clicked;
}
@property (nonatomic, retain) NSMutableArray *array;
@property (nonatomic) int clicked;

+(id)sharedManager;

@end    

Also I thought it wise to add:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{
static NSString *identifier = @"Events";
MKPinAnnotationView *retval = nil;
if ([annotation isKindOfClass:[Events class]]) 
{

    (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

    if (retval == nil) {
        retval = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier] autorelease];
        Helper *array = [Helper sharedManager];
        int clickedNum = [array.array indexOfObject:annotation];
        // Set up the Left callout
        UIButton *myDetailButton = [UIButton buttonWithType:UIButtonTypeCustom];
        myDetailButton.frame = CGRectMake(0, 0, 23, 23);
        myDetailButton.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
        myDetailButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;
        [myDetailButton setTag:clickedNum];
        NSLog([NSString stringWithFormat:@"Testing tag: %@", clickedNum]);
        [myDetailButton addTarget:self action:@selector(moreInfo:) forControlEvents:UIControlEventTouchUpInside];
        // Set the image for the button
        [myDetailButton setImage:[UIImage imageNamed:@"icon72.png"] forState:UIControlStateNormal];

        // Set the button as the callout view
        retval.leftCalloutAccessoryView = myDetailButton;
    }


    if (retval) {
        [retval setPinColor:MKPinAnnotationColorGreen];
        retval.animatesDrop = YES;
        retval.canShowCallout = YES;
    }
}

return retval;   
}

Answer 1

Your method moreInfo: doesn't match what you have set as the selector in

[myDetailButton addTarget:self action:@selector(moreInfo:event:) forControlEvents:UIControlEventTouchUpInside];

So change that to

[myDetailButton addTarget:self action:@selector(moreInfo:) forControlEvents:UIControlEventTouchUpInside];

Or change the method definition.