如何顺利切换回前一个游戏场景

Cocos2d-x
#1
  • 本帖最后由 googleman 于 2012-11-21 07:12 编辑 *

大家好！
我是一只小小鸟！各位老鸟好！有一个在android平台的“基本”问题想象各位老鸟请救！描述如下：

我使用一个layer制作了一个MODAL对话框。当用户从对话框中作出各种选择后，系统作出相应的响应。我的对话框类如下：
class GameoverDlg : public CCLayer {
private:

    // 模态对话框菜单(containing two buttons)
    CCMenu *m_pMenu;
    // 记录菜单点击
    bool m_bTouchedMenu;

…
bool init(){
if (!CCLayer::init())
{
return false;
}
this->setTouchEnabled(true);
this->setKeypadEnabled(true);
return true;
}
void keyBackClicked()
{
this->removeFromParentAndCleanup(true);
}
void MenuItemCallback(cocos2d::CCObject *pSender)
{
CCDirector::sharedDirector()->sharedDirector()->getRunningScene()->removeChild(this, true);
SoundManager::playPressBtn();

            // get the userdata, it's the index of the menu item clicked
            CCMenuItem* pMenuItem = (CCMenuItem *)(pSender);
            int nIdx = pMenuItem->getZOrder() - 10000;

            switch(nIdx){
            case 0:
                    {................
                    this->removeFromParentAndCleanup(true);
                    CCScene *pScene = FirstInterface::scene();
                    CCTransitionScene *transition = CCTransitionZoomFlipAngular::create(1.0f,pScene, kOrientationRightOver);
                    CCDirector::sharedDirector()->replaceScene(transition);
                    }
                    break;
            case 1:
                    {
                            this->removeFromParentAndCleanup(true);
                            //Not save and exit
                            CCUserDefault::sharedUserDefault()->setBoolForKey("bStored", false);

                            CCScene *pScene = FirstInterface::scene();
                            CCTransitionScene *transition = CCTransitionZoomFlipAngular::create(1.0f,pScene, kOrientationRightOver);
                            CCDirector::sharedDirector()->replaceScene(transition);

                    }
                    break;
            case 2:
                    this->removeFromParentAndCleanup(true);
                    break;
            }
    }
    void onEnter()
    {
            CCLayer::onEnter();
            CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, kCCMenuHandlerPriority - 1, true);

…
}
void onExit()
{
CCLayer::onExit();
…
CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);
}
bool ccTouchBegan(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
m_bTouchedMenu = m_pMenu->ccTouchBegan(pTouch, pEvent);
return true;
}
void ccTouchMoved(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
if (m_bTouchedMenu) {
m_pMenu->ccTouchMoved(pTouch, pEvent);
}
}
void ccTouchEnded(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
if (m_bTouchedMenu) {
m_pMenu->ccTouchEnded(pTouch, pEvent);
m_bTouchedMenu = false;
}
}
void ccTouchCancelled(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
if (m_bTouchedMenu) {
m_pMenu->ccTouchEnded(pTouch, pEvent);
m_bTouchedMenu = false;
}
}
};

在我的游戏主类中，我使用了如下方式调用上面的LAYER：
void GameLayer::showGameoverDlg()
{
SoundManager::playPopupDlg();
CCSize s = CCDirector::sharedDirector()->getWinSize();
CCSprite* backSprite = CCSprite::create(“images/gamelayer/dialog_bg.png”);//???
float layerWidth =backSprite->boundingBox().size.width;
float layerHeight =backSprite->boundingBox().size.height;

    GameoverDlg* l =new GameoverDlg(this,layerWidth,layerHeight, backSprite);
    l->setPosition((s.width - layerWidth) / 2,(s.height - layerHeight) / 2);
    l->autorelease();
    CCDirector::sharedDirector()->sharedDirector()->getRunningScene()->addChild(l,88888);

}
释放资源的代码大致如下：
void GameLayer::onExit()
{
CCLayerColor::onExit();
…
SimpleAudioEngine::sharedEngine()->end();
CCDirector::sharedDirector()->purgeCachedData();
}

现在的问题是：当我点击MODAL中的“保存并退出”或者“不保存并退出”，然后通过上面的replaceScene返回到前一个scene（FirstInterface）时，前一个场景FirstInterface界面只是简单地闪烁一下，便出现系统CRASH。

补充：我从前一个场景FirstInterface切换到上面的游戏主场景GameLayer时感觉比较正常，使用了如下代码：
void FirstInterface::startButtonHandler(CCObject* sender)
{
SimpleAudioEngine::sharedEngine()->playEffect(std::string(CCFileUtils::sharedFileUtils()->fullPathFromRelativePath(EFFECT_FILE)).c_str());

CCScene *pScene = GameLayer::scene();
CCTransitionScene *transition = CCTransitionZoomFlipAngular::create(1.0f,pScene, kOrientationRightOver);
CCDirector::sharedDirector()->replaceScene(transition);

}

怎么往回切换（由GameLayer到FirstInterface)就变得那么复杂了呢？是否是释放GameLayer中数据不当导致的吗？

请问各位老鸟，我上面的设计思路是否存在问题？我这几天都快闷死了！HELP！！！