In Objective C, can you check if an object has a particular property or message?

Question

I wat to do something like this:

if (viewController.mapView) [viewController.mapView someMethod];

However, if mapView is not a class variab

Answer 1

Oops, found it:

if ([vc respondsToSelector:@selector(mapView)]) {

  [[vc mapView] viewWillAppear:YES];

}