Do I need to declare my custom setter accessor in my interface/header file

Question

Hi there:
I'm working through a Objective C tutorial. I've got an instance var that is declared in the var section of my @interface (in the header file). It's also declared as a property...all the defaults apply (assign and whatever else).
@property int foo
I also have it synthesized in my @implementation code.
@synthesize foo;
I need a custom setter though that checks out the value being assigned. Do I need to declare this setter function in my @interface section in the header file?
-(void)setFoo:(int)newValue {
if (newValue < minAllowed) {
NSLog(@"Invalid foo: %i is less than the minimum of %i allowed", newValue, minAllowed);
return;
if (newValue > maxAllowed) {
NSLog(@"Invalid foo: %i is greater than the maximum of %i allowed", newValue, maxAllowed);
return;
foo = newValue;
} // setFoo()

Answer 1

The @property statement is the declaration of the accessor methods whether they are synthesized or custom coded.
For a fairly clear, detailed explanation see Accessor Methods in the +Memory Management Programming Guide for Cocoa+.