Cocos2d-x中单例的使用

大家都知道一个程序中只有一个导演类，eg:

 CCDirector *pDirectory = CCDirector::sharedDirector();//初始化导演类。

可通过 pDirectory->属性 取得自己想要的值。

我们也可以自己设定一个类用于存储只初始化一次的量，刚开始学2dx，今天为了2个CCLayer之间传值而使用单例，设定A界面的几个参数值，当A场景切换跳转到B界面时，B需要用到A界面的这几个参数值，故单独写了个单例类用于存储数据参数。

.h:

#ifndef __ResultCar__GameData__

#define __ResultCar__GameData__

#include <iostream>

#include "cocos2d.h"

class GameData : public cocos2d::CCObject {

public:

    static GameData* sharedGameData();

    CC_PROPERTY(float, myEngine, MyEngine);

    CC_PROPERTY(float, myG, MyG);

    CC_PROPERTY(float, myFrition, MyFrition);

};

.m:

#include "GameData.h"

GameData *gameData = NULL;

GameData* GameData::sharedGameData()

{

    if(!gameData)

        gameData = new GameData();

    return gameData;

}

float GameData::getMyEngine()

{

    return myEngine;

}

void GameData::setMyEngine(float engine)

{

    myEngine = engine;

}

float GameData::getMyG()

{

    return myG;

}

void GameData::setMyG(float g)

{

    myG = g;

}

float GameData::getMyFrition()

{

    return myFrition;

}

void GameData::setMyFrition(float frition)

{

    myFrition = frition;

}

当我存储数据的时候可通过以下代码存储:

GameData::sharedGameData()->setMyEngine(myEngine); // myEngine是A界面的参数

这里设定了3个参数分别存储:

GameData::sharedGameData()->setMyG(myI);

GameData::sharedGameData()->setMyFrition(myFriction);

当我在B界面用到这几个参数的时候可通过如下代码来获得:

//car_myEngine   car_myI  car_myFrition 为B界面用于接收数据的属性值

　 car_myEngine =  GameData::sharedGameData()->getMyEngine();

    car_myI = GameData::sharedGameData()->getMyG();

    car_myFrition = GameData::sharedGameData()->getMyFrition();