How can i tell if an object has a key value observer attached

Question

if you tell an objective c object to removeObservers: for a key path and that key path has not been registered, it cracks the sads. like -

\'Cannot remove an observe

Answer 1

In addition to Adam's answer I would like to suggest to use macro like this

#define SafeRemoveObserver(sender, observer, keyPath) \
@try{\
   [sender removeObserver:observer forKeyPath:keyPath];\
}@catch(id anException){\
}

example of usage

- (void)dealloc {
    SafeRemoveObserver(someObject, self, somePath);
}