Click on map pin for detail view gives EXC_BAD_ACCESS - objective-c

Question

I have implemented calloutAccessoryControlTapped like this:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view
calloutAccessoryControlTapped:(UIControl *)control
{
NSLog(#"calloutAccessoryControlTapped: annotation = %#", view.annotation.title);
if([_delegate respondsToSelector:#selector(mapView:didClickPinButton:)])
{
NSString *titleStr = [(DisplayMap *)view.annotation title];
[_delegate performSelector:#selector(mapView:didClickPinButton:)withObject:titleStr];
}
}
When I click on pin's button, it goes to method mapView:didClickPinButton on main view controller and shows an error:
Thread 1:EXC_BAD_ACCESS (Code=1,address=0x......)
This is the mapView:didClickPinButton: method:
- (void) mapView: (MapView *) mapView didClickPinButton:(NSString *) title
{
NSLog(#"bsn name-->%#",title);
for(int i=0;i<[self.categoryListArray count];i++)
{
NSMutableDictionary *couponDetail = [self.categoryListArray objectAtIndex:i];
if([[couponDetail objectForKey:#"category_name"] isEqualToString:title])
{
NSNumber *coupon_type=[couponDetail objectForKey:#"coupon_type"];
int c_type = [coupon_type intValue];
if(c_type == 1)
{
[self callServiceForCouponTypeOneBlock:[couponDetail objectForKey:#"id"] ];
break;
}
else if(c_type == 2)
{
BusinessViewController *businessVC = [[BusinessViewController alloc]initWithNibName:#"BusinessViewController" bundle:nil];
[businessVC setCouponListDetail:couponDetail];
[self.navigationController pushViewController:businessVC animated:YES];
break;
}
}
}

Answer 1

The problem is this line:
[_delegate performSelector:#selector(mapView:didClickPinButton:)withObject:titleStr];
The performSelector:withObject: method can only be used to call methods that have one object argument but your mapView:didClickPinButton: method has two object arguments.
You could instead use performSelector:withObject:withObject: which lets you call a method with two object arguments like this:
[_delegate performSelector:#selector(mapView:didClickPinButton:)
withObject:mapView withObject:titleStr];
However, using performSelector here doesn't seem to be really necessary.
It's much easier and simpler to just call the method directly on the delegate so it won't matter how many arguments the method has:
[_delegate mapView:mapView didClickPinButton:titleStr];