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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auto itemNor = Sprite::create("CloseNormal.png");
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auto menuItem = MenuItemSprite::create(itemNor,nullptr,nullptr,[](Ref* sender)
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{
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log("show this msg.");
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});
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auto menu = Menu::create(menuItem,nullptr);
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this->addChild(menu);
2.宏定义bind方式创建回调.
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auto itemNor = Sprite::create("CloseNormal.png");
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auto menuItem = MenuItemSprite::create(itemNor,nullptr,nullptr,CC_CALLBACK_1(HelloWorld::menuCloseCallback,this));
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auto menu = Menu::create(menuItem,nullptr);
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this->addChild(menu);
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void HelloWorld::menuCloseCallback(Ref* pSender)
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{
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log("show this msg.");
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}
3.MenuToggleItem回事件回调
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auto toggleSpNor = Label::createWithSystemFont("OPEN_BAME","WRYH",65);
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auto toggleSpSel = Label::createWithSystemFont("CLOSE_BAME","WRYH",65);
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auto toggleSpDis = Label::createWithSystemFont("DISABLE_BAME","WRYH",65);
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auto toggleItemNor = MenuItemLabel::create(toggleSpNor);
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auto toggleItemSel = MenuItemLabel::create(toggleSpSel);
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auto toggleItemDis = MenuItemLabel::create(toggleSpDis);
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auto toggleItem = MenuItemToggle::createWithCallback(CC_CALLBACK_0(HelloWorld::toggleCallBack,this),toggleItemNor,toggleItemSel,nullptr);
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auto toggleMenu = Menu::create(toggleItem,nullptr);
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this->addChild(toggleMenu);
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void HelloWorld::toggleCallBack()
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{
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log("Do something when toggle did touched..");
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}
二、定时器回调
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this->schedule(SEL_SCHEDULE(&HelloWorld::gameStep));
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this->scheduleOnce(SEL_SCHEDULE(&HelloWorld::gameStep),3.0f);\
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this->scheduleUpdate();
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void HelloWorld::gameStep(float dt)
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{
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log("on timer...");
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}
三、触屏事件回调
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auto touchEvt = cocos2d::EventListenerTouchOneByOne::create();
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touchEvt->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan,this);
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touchEvt->onTouchMoved = CC_CALLBACK_2(HelloWorld::onTouchMoved,this);
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touchEvt->onTouchEnded = CC_CALLBACK_2(HelloWorld::onTouchEnded,this);
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touchEvt->onTouchCancelled = CC_CALLBACK_2(HelloWorld::onTouchCancelled,this);
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Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchEvt,this);
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bool HelloWorld::onTouchBegan(cocos2d::Touch* touch,cocos2d::Event* evt)
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{
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log("Touch began..");
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return true;
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}
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void HelloWorld::onTouchMoved(cocos2d::Touch* touch,cocos2d::Event* evt)
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{
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log("Touch moved..");
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}
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void HelloWorld::onTouchEnded(cocos2d::Touch* touch,cocos2d::Event* evt)
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{
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log("Touch leave..");
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Director::getInstance()->getEventDispatcher()->removeEventListenersForTarget(this);
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}
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void HelloWorld::onTouchCancelled(cocos2d::Touch* touch,cocos2d::Event* evt)
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{
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log("Something was happend , touch event is cut..");
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}
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auto callBack = CallFunc::create(CC_CALLBACK_0(HelloWorld::actionCallBack,this));
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this->runAction(callBack);
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void HelloWorld::actionCallBack()
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{
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log("Do something when action did finished..");
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}
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auto callBack = [](EventCustom* evt)
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{
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log("catch an custom event!!");
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};
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cocos2d::EventListenerCustom* customEvt = EventListenerCustom::create("ME_CUSTOM_EVENT_TEST",callBack);
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Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(customEvt,12);
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Director::getInstance()->getEventDispatcher()->dispatchCustomEvent("ME_CUSTOM_EVENT_TEST");
Cocos2d-x 3.0 回调函数
原文：http://blog.csdn.net/w174504744/article/details/42873621
