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1. listener->onTouchBegan =CC_CALLBACK_2(HelloWorld::onTouchBegan, this);  
2. ... ...  
3. bool HelloWorld::onTouchBegan(Touch*touch, Event* event) {  
4.     ......  
5.     returnfalse;  
6. }  

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1. listener->onTouchBegan = [](Touch*touch, Event* event){  
2.    ... ...  
3.    return false;  
4. };  

提示 在Lambda表达式中[]表示接下来开始定义Lambda函数，[]之后的()是Lambda函数的参数列表，{}中间就是函数体。

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1. void HelloWorld::onEnter()  
2. {  
3.     Layer::onEnter();  
4.     log("HelloWorldonEnter");  
5.      
6.    auto listener = EventListenerTouchOneByOne::create();  
7.    listener->setSwallowTouches(true);  
8.      
9.    listener->onTouchBegan = [](Touch* touch, Event* event){                                                      ①           
10.        auto target = static_cast<Sprite*>(event->getCurrentTarget());  
11.              PointlocationInNode = target->convertToNodeSpace(touch->getLocation());  
12.        Size s = target->getContentSize();  
13.        Rect rect = Rect(0, 0, s.width, s.height);  
14.    
15.        if (rect.containsPoint(locationInNode))  
16.        {  
17.             log("sprite x = %f, y = %f", locationInNode.x, locationInNode.y);  
18.                        log("spritetag = %d", target->getTag());  
19.                       target->runAction(ScaleBy::create(0.06f,1.06f));  
20.             return true;  
21.        }  
22.        return false;  
23.    };  
24.      
25.    listener->onTouchMoved = [](Touch* touch, Event* event){                                                      ②  
26.        auto target = static_cast<Sprite*>(event->getCurrentTarget());  
27.        // 移动当前按钮精灵的坐标位置  
28.        target->setPosition(target->getPosition() + touch->getDelta());  
29.    };  
30.    
31.    listener->onTouchEnded = [](Touch* touch, Event* event){                                                      ③  
32.        auto target = static_cast<Sprite*>(event->getCurrentTarget());  
33.        log("sprite onTouchesEnded.. ");  
34.    
35.                 PointlocationInNode = target->convertToNodeSpace(touch->getLocation());  
36.        Size s = target->getContentSize();  
37.        Rect rect = Rect(0, 0, s.width, s.height);  
38.         
39.        if (rect.containsPoint(locationInNode))  
40.        {  
41.             log("sprite x = %f, y = %f", locationInNode.x, locationInNode.y);  
42.                       log("sprite tag = %d",target->getTag());  
43.                       target->runAction(ScaleTo::create(0.06f,1.0f));  
44.        }  
45.    };  
46.    
47.     //添加监听器  
48.     EventDispatcher*eventDispatcher = Director::getInstance()->getEventDispatcher();  
49.     eventDispatcher->addEventListenerWithSceneGraphPriority(listener,  
50.                                                                                      getChildByTag(kBoxA_Tag));  
51.     eventDispatcher->addEventListenerWithSceneGraphPriority(listener->clone(),  
52.                                                                                      getChildByTag(kBoxB_Tag));  
53.     eventDispatcher->addEventListenerWithSceneGraphPriority(listener->clone(),  
54.                                                                                      getChildByTag(kBoxC_Tag));  
55. }  

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1. class HelloWorld : public cocos2d::Layer  
2. {  
3. public:  
4.    static cocos2d::Scene* createScene();  
5.   virtual bool init();   
6.     virtualvoid onEnter();  
7.     virtualvoid onExit();  
8.      
9.    CREATE_FUNC(HelloWorld);  
10. };