一、button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。
auto itemNor = Sprite::create("CloseNormal.png");
auto menuItem = MenuItemSprite::create(itemNor,nullptr,nullptr,[](Ref* sender)
{
log("show this msg.");
});
auto menu = Menu::create(menuItem,nullptr);
this->addChild(menu);
2.宏定义bind方式创建回调.
auto itemNor = Sprite::create("CloseNormal.png");
auto menuItem = MenuItemSprite::create(itemNor,nullptr,nullptr,CC_CALLBACK_1(HelloWorld::menuCloseCallback,this));
auto menu = Menu::create(menuItem,nullptr);
this->addChild(menu);
void HelloWorld::menuCloseCallback(Ref* pSender)
{
log("show this msg.");
}
auto toggleSpNor = Label::createWithSystemFont("OPEN_BAME","WRYH",65);
auto toggleSpSel = Label::createWithSystemFont("CLOSE_BAME","WRYH",65);
auto toggleSpDis = Label::createWithSystemFont("DISABLE_BAME","WRYH",65);
auto toggleItemNor = MenuItemLabel::create(toggleSpNor);
auto toggleItemSel = MenuItemLabel::create(toggleSpSel);
auto toggleItemDis = MenuItemLabel::create(toggleSpDis);
auto toggleItem = MenuItemToggle::createWithCallback(CC_CALLBACK_0(HelloWorld::toggleCallBack,this),toggleItemNor,toggleItemSel,nullptr);
auto toggleMenu = Menu::create(toggleItem,nullptr);
this->addChild(toggleMenu);
void HelloWorld::toggleCallBack()
{
log("Do something when toggle did touched..");
}二、定时器回调
/*周期定时调用*/
this->schedule(SEL_SCHEDULE(&HelloWorld::gameStep));
/*倒计是定时调用一次*/
this->scheduleOnce(SEL_SCHEDULE(&HelloWorld::gameStep),3.0f);/*周期定时调用update需重写update方法*/
this->scheduleUpdate();
void HelloWorld::gameStep(float dt)
{
log("on timer...");
}三、触屏事件回调
auto touchEvt = cocos2d::EventListenerTouchOneByOne::create();
touchEvt->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan,this);
touchEvt->onTouchMoved = CC_CALLBACK_2(HelloWorld::onTouchMoved,this);
touchEvt->onTouchEnded = CC_CALLBACK_2(HelloWorld::onTouchEnded,this);
touchEvt->onTouchCancelled = CC_CALLBACK_2(HelloWorld::onTouchCancelled,this);
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchEvt,this);
bool HelloWorld::onTouchBegan(cocos2d::Touch* touch,cocos2d::Event* evt)
{
log("Touch began..");
return true;
}
void HelloWorld::onTouchMoved(cocos2d::Touch* touch,cocos2d::Event* evt)
{
log("Touch moved..");
}
void HelloWorld::onTouchEnded(cocos2d::Touch* touch,cocos2d::Event* evt)
{
log("Touch leave..");
Director::getInstance()->getEventDispatcher()->removeEventListenersForTarget(this);
}
void HelloWorld::onTouchCancelled(cocos2d::Touch* touch,cocos2d::Event* evt)
{
log("Something was happend , touch event is cut..");
}
四、动作回调
auto callBack = CallFunc::create(CC_CALLBACK_0(HelloWorld::actionCallBack,this));
this->runAction(callBack);
void HelloWorld::actionCallBack()
{
log("Do something when action did finished..");
}
五、自己定义事件回调
auto callBack = [](EventCustom* evt)
{
log("catch an custom event!!");
};
cocos2d::EventListenerCustom* customEvt = EventListenerCustom::create("ME_CUSTOM_EVENT_TEST",callBack);
//注冊自己定义事件（处理优先级为12）
Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(customEvt,12);
//抛出自己定义事件
Director::getInstance()->getEventDispatcher()->dispatchCustomEvent("ME_CUSTOM_EVENT_TEST");