cocos2d-x添加触摸层阻止后端事件

        由于cocos2d-x中的优先级小的，先响应触摸事件，这是，我们只需要设置新添加的cclayer层的优先级即可，但由于ccmenu的优先级较高，所以，很有可能透过我们添加的触摸层，响应之前的绑定的button事件，而如果我们设置此触摸层优先级比button的低时，又导致在这层添加的button按钮的触摸事件不能触发，导致本层应该触摸的事件也不能响应，这样也达不到我们理想的效果：弹出一个层，屏蔽后面的事件，在当层可以有一些按钮，让我们进行不同的选择，比如确定，or 取消。

         自从cocos2d-x2.0版本后，添加了一个CCControlButton，这个优先级为0，比默认的button高，因此，我们可以在当前层添加CCControlButton，在弹出的层设置layer的优先级比0小，这样，在弹出的层添加menu就能够响应，也不会影响后面的事件。当然，由于CCControlButton的优先级是可以自动设置的，所以，我们也可以设置弹出的层为-128（或者更小），然后设置CCControlButton的优先级更小就可以了。

      具体代码如下：

BlockTouchLayer *block = BlockTouchLayer::create();
this->addChild(block);

BlockTouchLayer的声明文件：

#ifndef __test__BlockTouchLayer__
#define __test__BlockTouchLayer__

#include 
#include "cocos2d.h"
#include "cocos-ext.h"
using namespace cocos2d;
class BlockTouchLayer :public CCLayerColor
{
public:
    virtual bool init();
    void initData();
    
    virtual void registerWithTouchDispatcher();  //重写触摸事件，阻止后端事件响应
    virtual bool ccTouchBegan(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);
    virtual void ccTouchMoved(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);
    virtual void ccTouchEnded(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent);
    
    void callBack(CCObject *pSender,CCControlEvent event);
    
    CREATE_FUNC(BlockTouchLayer);
    
};
#endif

BlockTouchLayer的具体实现文件：

#include "BlockTouchLayer.h"
USING_NS_CC_EXT;

bool BlockTouchLayer::init()
{
    ccColor4B color = {100,0,0,125};  //设置面板颜色及透明度
    if (!CCLayerColor::initWithColor(color))
    {
        return false;
    }
    initData();
    setTouchEnabled(true);   //开启触摸事件
    return true;
}
void BlockTouchLayer::initData()
{
    CCSize winsize = CCDirector::sharedDirector()->getWinSize();
    CCSprite *sp = CCSprite::create("Icon.png");
    this->addChild(sp);
    sp->setPosition(ccp(winsize.width/2,winsize.height/2));
    
    CCSpriteFrameCache *cache = CCSpriteFrameCache::sharedSpriteFrameCache();
    cache->addSpriteFramesWithFile("load.plist", "load.png");
    
    CCSprite *sprite1 = CCSprite::createWithSpriteFrameName("loading1.png");
    sprite1->setPosition(ccp(winsize.width/2, winsize.height/2));
    //this->addChild(sprite1);
    
    CCSpriteBatchNode *batchNode = CCSpriteBatchNode::create("load.png");
    batchNode->addChild(sprite1);
    this->addChild(batchNode);   // 可以起到一定的优化作用，最好不要直接添加精灵
    
    CCArray *spriteArray = CCArray::create();
    char str[100] = {0};
    for (int i=1; i <= 14; i++)
    {
        sprintf(str, "loading%d.png", i);
        CCSpriteFrame *frame = cache->spriteFrameByName(str);
        spriteArray->addObject(frame);
    }
    CCAnimation *animation = CCAnimation::createWithSpriteFrames(spriteArray,0.5);
    sprite1->runAction(CCRepeatForever::create(CCAnimate::create(animation)));
    
    cocos2d::extension::CCScale9Sprite *sprite9 = cocos2d::extension::CCScale9Sprite::create("btn_blackblue.png");
    CCLabelTTF *label = CCLabelTTF::create("click me", "", 22);
    cocos2d::extension::CCControlButton *controlButton = cocos2d::extension::CCControlButton::create(label, sprite9);
    controlButton->addTargetWithActionForControlEvents(this, cccontrol_selector(BlockTouchLayer::callBack), cocos2d::extension::CCControlEventTouchDown);
    this->addChild(controlButton);
    controlButton->setPosition(ccp(winsize.width/3, winsize.height/2));
    controlButton->setTouchPriority(-200);   //设置CCControlButton的优先级
    //controlButton->setZoomOnTouchDown(true);
    
    
    
}
void BlockTouchLayer::callBack(cocos2d::CCObject *pSender,CCControlEvent event)
{
    //CCNotificationCenter::sharedNotificationCenter()->postNotification("click",this);
    BlockTouchLayer *tmplayer = (BlockTouchLayer *)((CCMenu *)(pSender))->getParent();
    tmplayer->removeFromParentAndCleanup(true);    //点击按钮后，移除弹出的面板
}
void BlockTouchLayer::registerWithTouchDispatcher()
{
    CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, -128, true);  //注册并设置当前面板触摸的优先级
}
bool BlockTouchLayer::ccTouchBegan(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
    return true;       // 吞噬掉后面的响应
}
void BlockTouchLayer::ccTouchEnded(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
    
}
void BlockTouchLayer::ccTouchMoved(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
    
}

最终实现页面：

第一张图片点击右下角的退出按钮，没有反应，点击click me按钮，取消当前层显示原来的hello world层，此时退出按钮有效。