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Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
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Chapter 11 - Categories and Protocols
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About implement methods in category!
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Topic: About implement methods in category! (Read 1957 times)
diuming
Newbie
Posts: 8
About implement methods in category!
«
on:
May 04, 2010, 06:53:17 AM »
You don't need to implement all the methods in a category (P230).
I just implement an add method in category, But I get two warning messages in Code.
(1)warning: incomplete implementation of category 'Math'
(2)warning: method definition for '-sub:' not found
How about these warning message, Is it important or not?
#import <Cocoa/Cocoa.h>
#import "Fraction.h"
@interface Fraction (Math)
- (Fraction *)add:(Fraction *)f;
- (Fraction *)sub:(Fraction *)f;
@end
#import "FractionMath.h"
@implementation Fraction (Math)
- (Fraction * )add:(Fraction *)f {
Fraction * result = [[Fraction alloc] inti];
[result setTo:(numerator * [f denominator]) + (denominator * [f numerator])
over:denominator * [f denominator]];
return result;
}
@end
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skochan
Administrator
Hero Member
Posts: 3114
Re: About implement methods in category!
«
Reply #1 on:
May 04, 2010, 07:05:50 AM »
They're just warnings. That means the program can still be successfully compiled and run.
Cheers,
Steve Kochan
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