cocos2dx 顶层layer

如何在cocos2dx里添加顶层layer
所谓顶层layer，是指不会因为scene的切换而切换掉的层！

构造示意图如下：

在director的头文件里添加CCLayer *m_pTopLayer;和

////   set the topLayer

    void setTopLayer(CCLayer *layer);

在.cpp里加上以下代码

voidCCDirector::setTopLayer(CCLayer *layer)
{
    m_pTopLayer = layer;

}

上面的只是设置layer，如果我们要让其显示在设备上，我们还需要添加以下代码，在drawScene(void)方法里加入以下代码

// draw the top layer
    if (m_pTopLayer) {
        m_pTopLayer->visit();

    }

这样了我们的director已经改完了！

之后我们就写TopLayer了

WindyTopLayer.h:

 

#ifndef __HeroLegend__WindyTopLayer__
#define __HeroLegend__WindyTopLayer__

#include "cocos2d.h"

class WindyTopLayer : publiccocos2d::CCLayer
{
    /// @{
    /// @name constructors
public:
    CREATE_FUNC(WindyTopLayer);
    WindyTopLayer();
    virtual ~WindyTopLayer();
    staticWindyTopLayer *getInstace();
    /// @} end constructors
   
    /// @{
    /// @name methods
public:
    bool init();
    void addNode(cocos2d::CCNode* node);
    void showUI();
    void removeUI();
    /// @} end methods
};

#endif /* defined(__HeroLegend__WindyTopLayer__) */

 

WindyTopLayer.cpp:

 

#include "WindyTopLayer.h"

USING_NS_CC;

staticWindyTopLayer* m_topLayer = NULL;

WindyTopLayer::WindyTopLayer()
{
}

WindyTopLayer::~WindyTopLayer()
{
}

WindyTopLayer *WindyTopLayer::getInstace()
{
    if (m_topLayer == NULL) {
        m_topLayer = WindyTopLayer::create();
        m_topLayer->retain();
    }
    returnm_topLayer;
}

boolWindyTopLayer::init()
{
    if (!CCLayer::init()) {
        returnfalse;
    }
    returntrue;
}

voidWindyTopLayer::addNode(cocos2d::CCNode* node)
{
    addChild(node);
    showUI();
}

voidWindyTopLayer::showUI()
{
    if (m_topLayer) {
        m_topLayer->onEnter();
        CCDirector::sharedDirector()->setTopLayer(m_topLayer);
    }
}

voidWindyTopLayer::removeUI()
{
    m_topLayer->removeAllChildren();
    m_topLayer->onExit();
    CCDirector::sharedDirector()->setTopLayer(NULL);
    m_topLayer->removeFromParent();

}

逻辑的话，相信大家都能看得懂，都是些基本东西！