一、按钮回调

1. Lambda 表达式，C++11 Lambda 赋予了Cocos2d-x 3.0创建回调函数的灵活性。

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1. auto itemNor    =   Sprite::create("CloseNormal.png");
2. auto menuItem   =   MenuItemSprite::create(itemNor,nullptr,nullptr,[](Ref* sender)
3. {
4. log("show this msg.");
5. });
6. auto menu   =   Menu::create(menuItem,nullptr);
7. this->addChild(menu);

2.宏定义bind方式创建回调.

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1. auto itemNor    =   Sprite::create("CloseNormal.png");
2. auto menuItem   =   MenuItemSprite::create(itemNor,nullptr,nullptr,CC_CALLBACK_1(HelloWorld::menuCloseCallback,this));
3. auto menu   =   Menu::create(menuItem,nullptr);
4. this->addChild(menu);
5. void HelloWorld::menuCloseCallback(Ref* pSender)
6. {
7. log("show this msg.");
8. }

3.MenuToggleItem回事件回调

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1. auto toggleSpNor    =   Label::createWithSystemFont("OPEN_BAME","WRYH",65);
2. auto toggleSpSel    =   Label::createWithSystemFont("CLOSE_BAME","WRYH",65);
3. auto toggleSpDis    =   Label::createWithSystemFont("DISABLE_BAME","WRYH",65);
4. auto toggleItemNor  =   MenuItemLabel::create(toggleSpNor);
5. auto toggleItemSel  =   MenuItemLabel::create(toggleSpSel);
6. auto toggleItemDis  =   MenuItemLabel::create(toggleSpDis);
7. auto toggleItem     =   MenuItemToggle::createWithCallback(CC_CALLBACK_0(HelloWorld::toggleCallBack,this),toggleItemNor,toggleItemSel,nullptr);
8. auto toggleMenu =   Menu::create(toggleItem,nullptr);
9. this->addChild(toggleMenu);
10. void HelloWorld::toggleCallBack()
11. {
12. log("Do something when toggle did touched..");
13. }

二、定时器回调

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1. /*周期定时调用*/
2. this->schedule(SEL_SCHEDULE(&HelloWorld::gameStep));
3. /*倒计是定时调用一次*/
4. this->scheduleOnce(SEL_SCHEDULE(&HelloWorld::gameStep),3.0f);\
5. /*周期定时调用update需重写update方法*/
6. this->scheduleUpdate();
7. void HelloWorld::gameStep(float dt)
8. {
9. log("on timer...");
10. }

三、触屏事件回调

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1. auto touchEvt           =   cocos2d::EventListenerTouchOneByOne::create();
2. touchEvt->onTouchBegan       =   CC_CALLBACK_2(HelloWorld::onTouchBegan,this);
3. touchEvt->onTouchMoved       =   CC_CALLBACK_2(HelloWorld::onTouchMoved,this);
4. touchEvt->onTouchEnded      =    CC_CALLBACK_2(HelloWorld::onTouchEnded,this);
5. touchEvt->onTouchCancelled     = CC_CALLBACK_2(HelloWorld::onTouchCancelled,this);
6. Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchEvt,this);
7. bool HelloWorld::onTouchBegan(cocos2d::Touch* touch,cocos2d::Event* evt)
8. {
9. log("Touch began..");
10. return true;
11. }
12. void HelloWorld::onTouchMoved(cocos2d::Touch* touch,cocos2d::Event* evt)
13. {
14. log("Touch moved..");
15. }
16. void HelloWorld::onTouchEnded(cocos2d::Touch* touch,cocos2d::Event* evt)
17. {
18. log("Touch leave..");
19. Director::getInstance()->getEventDispatcher()->removeEventListenersForTarget(this);
20. }
21. void HelloWorld::onTouchCancelled(cocos2d::Touch* touch,cocos2d::Event* evt)
22. {
23. log("Something was happend , touch event is cut..");
24. }

四、动作回调

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1. auto callBack       =   CallFunc::create(CC_CALLBACK_0(HelloWorld::actionCallBack,this));
2. this->runAction(callBack);
3. void HelloWorld::actionCallBack()
4. {
5. log("Do something when action did finished..");
6. }

五、自定义事件回调

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1. auto callBack       =   [](EventCustom* evt)
2. {
3. log("catch an custom event!!");
4. };
5. cocos2d::EventListenerCustom* customEvt =   EventListenerCustom::create("ME_CUSTOM_EVENT_TEST",callBack);
6. //注册自定义事件（处理优先级为12）
7. Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(customEvt,12);
8. //抛出自定义事件
9. Director::getInstance()->getEventDispatcher()->dispatchCustomEvent("ME_CUSTOM_EVENT_TEST");