How to implement objective-c 's delegates ?

cocos2d-x C++
#1

Hi

I ’m in the process of migrating my game from cocos2d-iphone to cocos2d-x, so I may have a few questions these days :slight_smile:
I was wondering what’s the best way to implement delegates in cocos2d-x ?
In objective-C I have a navigation layer with a delegate like this :

@protocol NavigationDelegate
- (void)back;
- (void)forth;
@end

@interface NavigationLayer : CCLayer
{
    id delegate;
}

And other layers implementation looks like :

@interface MyScene : CCLayer
...
[navigationLayer setDelegate:self];

- (void)back { ... }
- (void)forth { ... }

How can I convert this code to cocos2d-x and c++ ?

Thanks in advance

#2

You can refer to the implementation of CCTouchDelegate.

#3

Thanks Walzer !

#4

blue eur wrote:

Thanks Walzer !

I hate to be dense, but every time I try and declare a CCLayer subclass as CCListViewDelegate as shown in CCLayer with CCTouchDelegate (or any other delegate) the compiler complains at LAYER_CREATE_FUNC(MyLayerClass) saying “Allocating an object of abstract class ‘MyClassName’”. blue eur or anybody else, any chance I can beg a snippet of code as an example?

#5

Hi Chris,

Did you implement the delegate methods in your class ?
Something like that :

class MyDelegate
{
public:
    MyDelegate() {};
    virtual ~MyDelegate() {};

    virtual void method1() {};
    virtual void method2() {};
};


class MyScene : public CCScene, public MyDelegate
{
protected:
    virtual void method1() {};
    virtual void method2() {};
};