在每个循环(cocos2dx)中，类的成员变量已被更改

我在cocos2dx程序中声明了一些类，并为它们的成员变量设置了一些值，但是在每次程序循环(CCDirector的主循环)之后，它们的所有值都被删除了!我希望它类保存下一个场景，当场景应该被替换时，它应该被替换或推送(正如你可以在代码中看到的，2秒后，introPage类调用函数"IntoPageDone"，场景应该被替换)，我为下一个场景设置了一个名为 nextScene的变量，但在每次循环之后，它的值改变为NULL。请帮助我解决这个问题，还有有没有更好的方法处理场景和他们的变化??非常感谢!

StartingPage是一个继承自CCLayerColor的类。以下是CoCoGui.h文件:

#ifndef _COCOGUI_H_
#define _COCOGUI_H_
#include "StartingPage.h"
#include "IntroPage.h"
using namespace cocos2d;
class CoCoGui : public CCLayerColor{
public:
    CoCoGui();
    virtual ~CoCoGui(void);
    virtual bool init();
    static CCScene* scene();
    CREATE_FUNC(CoCoGui);
private:
    IntroPage * introPage;
    StartingPage * startingPage;
    void onEnterTransitionDidFinish();
};
#endif /* COCOGUI_H */

#include "CoCoGui.h"
#include <iostream>
using namespace std;
CCScene* CoCoGui::scene(){
    CCScene *scene = CCScene::create();
    CoCoGui *layer = CoCoGui::create();
    scene->addChild(layer);
    return scene;
}
CoCoGui::CoCoGui ( )
{
    this->startingPage = new StartingPage ( );
    this->introPage = new IntroPage ( );
}
CoCoGui::~CoCoGui(void)
{
    delete introPage;
    delete startingPage;
}
bool CoCoGui::init ( ){
    if ( !CCLayerColor::initWithColor ( ccc4 (100,100,100,255) ) ){
        return false;
    }
    return true;
}
void CoCoGui::onEnterTransitionDidFinish ( ){
    this->introPage->setNextScene ( StartingPage::scene( ) );
    CCScene * scene = NULL;
    scene = IntroPage::scene();
    CCTransitionFade * trans = CCTransitionFade::create( 0.4f, scene , ccBLACK);
    CCDirector::sharedDirector()->pushScene(trans);
    cout << "step" << endl;
}

这是introPage.h文件:

#ifndef INTROPAGE_H_
#define INTROPAGE_H_
#include "cocos2d.h"
#include "StartingPage.h"
using namespace cocos2d;
class IntroPage: public CCLayerColor {
public:
    IntroPage( CCScene * nextScene );
    IntroPage ( );
    virtual ~IntroPage();
    static CCScene* scene();
    bool init();
    void intoPageDone();
    CREATE_FUNC(IntroPage);
    CC_SYNTHESIZE_READONLY(CCLabelTTF*, _label, Label);
    CCScene * getNextScene( );
    void setNextScene ( CCScene * nScene );
private:
    CCScene * nextScene;
};
#endif /* INTROPAGE_H_ */

还有 IntroPage.cpp:

#include "IntroPage.h"
IntroPage::IntroPage( CCScene * nextScene ) {
    this->introPageDone = false;
    this->setNextScene ( nextScene );
}
IntroPage::IntroPage( ){
}
IntroPage::~IntroPage() {
}
void IntroPage::setNextScene ( CCScene * nScene ){
    this->nextScene = nScene;
}
CCScene* IntroPage::scene(){
    CCScene *scene = CCScene::create();
    IntroPage *layer = IntroPage::create();
    scene->addChild(layer);
    return scene;
}
bool IntroPage::init() {
    if (CCLayerColor::initWithColor (ccc4(0, 0, 0, 255) )) {
        this->runAction(
                CCSequence::actions(CCDelayTime::actionWithDuration(2),
                        CCCallFunc::actionWithTarget(this,
                                callfunc_selector(IntroPage::intoPageDone)),
                        NULL));
        return true;
    }
    return false;
}
void IntroPage::intoPageDone() {
    this->introPageDone = true;
    CCDirector::sharedDirector( )->popScene( );
    CCDirector::sharedDirector( )->pushScene( this->nextScene );
}