cocos2dx 添加一个新建层的方法。

以Helloworld修改为例。

1. 库文件添加新层类 继承自CCLayer

class NewLayer1 : public cocos2d::CCLayer
{
public:
virtual bool init();


CREATE_FUNC(NewLayer1);
};

2. 场景中添加NewLayer::create()接口

CCScene* HelloWorld::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    HelloWorld *layer = HelloWorld::create();


// masai NewLayer
NewLayer1 *NewLayer_1 = NewLayer1::create();


    // add layer as a child to scene
    scene->addChild(layer);
    scene->addChild(NewLayer_1);


    // return the scene
    return scene;
}

3. NewLayer初始化

bool NewLayer1::init()
{
CCSprite* NLayer = CCSprite::create("NLayer.png");
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
NLayer->setPosition(ccp(visibleSize.width/2, visibleSize.height/2));
//NLayer->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

addChild(NLayer);
return true;
}

==================

全部代码示例：
HelloWorldScene.h

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__


#include "cocos2d.h"


class HelloWorld : public cocos2d::CCLayer
{
public:
    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  


    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::CCScene* scene();
    
    // a selector callback
    void menuCloseCallback(CCObject* pSender);
    
    // implement the "static node()" method manually
    CREATE_FUNC(HelloWorld);
};


class NewLayer1 : public cocos2d::CCLayer
{
public:
virtual bool init();


CREATE_FUNC(NewLayer1);
};


class NewLayer2 : public cocos2d::CCLayer
{
public:
virtual bool init();


CREATE_FUNC(NewLayer2);
};



#endif // __HELLOWORLD_SCENE_H__

=========

HelloWorldScene.cpp

#include "HelloWorldScene.h"


USING_NS_CC;


CCScene* HelloWorld::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    HelloWorld *layer = HelloWorld::create();


// masai NewLayer
NewLayer1 *NewLayer_1 = NewLayer1::create();


    // add layer as a child to scene
    scene->addChild(layer);
scene->addChild(NewLayer_1);


    // return the scene
    return scene;
}


// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !CCLayer::init() )
    {
        return false;
    }
    
    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
    CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();


    /////////////////////////////
    // 2. add a menu item with "X" image, which is clicked to quit the program
    //    you may modify it.


    // add a "close" icon to exit the progress. it's an autorelease object
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                        "CloseNormal.png",
                                        "CloseSelected.png",
                                        this,
                                        menu_selector(HelloWorld::menuCloseCallback));
    
pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 ,
                                origin.y + pCloseItem->getContentSize().height/2));


    // create menu, it's an autorelease object
    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
    pMenu->setPosition(CCPointZero);
    this->addChild(pMenu, 1);


    /////////////////////////////
    // 3. add your codes below...


    // add a label shows "Hello World"
    // create and initialize a label
    
    CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24);
    
    // position the label on the center of the screen
    pLabel->setPosition(ccp(origin.x + visibleSize.width/2,
                            origin.y + visibleSize.height - pLabel->getContentSize().height));


    // add the label as a child to this layer
    this->addChild(pLabel, 1);


    // add "HelloWorld" splash screen"
    CCSprite* pSprite = CCSprite::create("HelloWorld.png");


    // position the sprite on the center of the screen
    pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));


    // add the sprite as a child to this layer
    this->addChild(pSprite, 0);
    
    return true;
}


bool NewLayer1::init()
{
CCSprite* NLayer = CCSprite::create("NLayer.png");
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
NLayer->setPosition(ccp(visibleSize.width/2, visibleSize.height/2));
//NLayer->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

addChild(NLayer);
return true;
}


void HelloWorld::menuCloseCallback(CCObject* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
#else
    CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
#endif
}