Question

Consider the following code:

// MyClass.h
@interface MyClass
    @property NSInteger Value;
@end

//MyClass.m
@implementation MyClass
    @synthesize Value;
@end

What are the minimal code modifications that I’d need to make if I wanted to override only the synthesized setter method for Value?

As a follow-up, what are the minimal modifications that I’d have to make in order to override only the synthesized getter method?

EDIT

Overriding is simple. (See answers below.) In my case, I was getting a nasty warning because I hadn’t included the nonatomic attribute with my property definitions. Adding the attribute has solved my initial problem resulting in this question.

Answer 1

Apparently it’s not possible to override just one or the other for an atomic property. You must change it to have the nonatomic attribute.

@property (nonatomic) NSInteger value;

I didn’t know that five minutes ago, and it’s not noted anywhere in TOCPL as far as I can see.

_{Also change the name to be lower-case. Convention in ObjC is for lower initial letters for ivars.}

Beyond that, just implement whichever you want, and the compiler will do the rest. You can validly override none, one, or both.

Just the getter:

@implementation MyClass

@synthesize value;

- (NSInteger) value {
    return value;
}

@end

Just the setter:

@implementation MyClass

@synthesize value;

- (void) setValue: (NSInteger)newValue {
    value = newValue;
}

@end

The methods for object types (and covering atomicity) are only slightly more complicated; there are several question here on SO, and some info in the Apple docs that will explain.