KVO (Key Value Observing)
You can generate KVO code from the main interface or via a utility panel that pops up from the Action Menu or Action Panel
When selecting KVO... from the Action Menu or Action Panel, a utility panel appears where you can enter the values you need.
+ (NSSet *)keyPathsForValuesAffectingPerson {
return [NSSet setWithObjects:@"age", @"weight", @"height", @"firstName", @"lastName", nil];
}
Results