New way to declare private methods

Normally I would put private methods in the header file. But noticed from "Learn Cocos2D 2nd Edition" book a different way been used.

The header file is quite simple:

#import "cocos2d.h"

@interface HelloWorld : CCLayer

{

}

// returns a Scene that contains the HelloWorld as the only child

+(id) scene;

@end

The private methods are however declared in the .m file as shown below with "(PrivateMethods)" added behind "@interface":

#import "HelloWorldScene.h"

// private methods are declared in this manner to avoid "may not respond to ..." compiler warnings

@interface HelloWorld (PrivateMethods)

-(void) onCallFunc;

-(void) onCallFuncN:(id)sender;

-(void) onCallFuncND:(id)sender data:(void*)data;

-(void) onCallFuncO:(id)object;

-(void) createLabelWithOffset:(int)offset;

@end

@implementation HelloWorld

This is completely new to me and indeed quite interesting!

Posted in: things learned