Cocos2d-x 3.4 Action管理(ActionManager)总结

Cocos2d-x Action管理

动作管理类CCActionManager是一个管理所有动作的单例，工作原理是：当CCNode执行runAction时，该函数会把动作通过动作管理类的addAction函数将对象传递给CCActionManager的单例，该实例再把这个动作添加到自己的动作序列中。

动作管理单例通过定时刷新自己的update方法，在这个方法中去调用行为序列中每个动作的step（暂停的行为不会update），这些step方法再根据自身的完成进度去update或是结束行为。

实际上是由动作管理单例驱动的每个动作去更新自己的逻辑，而runAction方法只是将行为对象添加进CCActionManager的待执行队列。当节点被清除或是行为结束时，动作管理类会自动将动作从队列中删除，不需要程序员的管理。

一般情况下，不需要使用这个单例来管理动作，可以使用CCNode类的stopAction、stopActionByTag和stopActions等函数来管理、但是有两种情况需要使用CCActionManager类单例：

<1> 动作的执行者不是同一个节点。 <2> 需要暂停/重启活动时。

一、CC_CALLBACK_0 不带参数

auto child = Sprite::create("Images/grossini.png");

Rect r = Director::getInstance()->getOpenGLView()->getVisibleRect();

Vec2 v2 = Vec2(r.origin.x+300,r.origin.y/2+r.size.height-300);

child->setPosition(v2);

addChild(child,1);

child->runAction(RotateBy::create(1.5f,90));//顺时针旋转 90度

child->runAction(Sequence::create(DelayTime::create(1.4f),FadeOut::create(1.1f),nullptr));//1.4秒后，消失

child->runAction(CallFunc::create(CC_CALLBACK_0(HelloWorld::remove,this)),nullptr));//1.4秒后，执行remove方法

void HelloWorld::remove(){

CCLOG("bbbbbbbbbb");

}

二、CC_CALLBACK_1 带一个参数

auto child1 = "Images/grossini.png");

addChild(child1,2);

Rect r1 = Director::getInstance()->getOpenGLView()->getVisibleRect();

Vec2(r1.origin.x+300,r1.origin.y/2+r1.size.height-300);

child1->setPosition(v2);

child1->runAction(MoveBy::create(1,175); font-family:新宋体; font-size:9.5pt">Vec2(150,0)),175); font-family:新宋体; font-size:9.5pt">CallFuncN::create(CC_CALLBACK_1(HelloWorld::update1,nullptr));

void HelloWorld::update1(Node* node){

node->stopAllActions();

node->runAction(ScaleTo::create(2,2));

//removeChild(node);

}

三、CC_SCHEDULE_SELECTOR先执行一个动作然后定时执行某个动作

auto child2 = "Images/grossini.png");

addChild(child2,121);

Director::getInstance()->getOpenGLView()->getVisibleRect();

Vec2(r1.origin.x + 300,r1.origin.y/2 + r1.size.height -300);

child2->setPosition(v2);

auto action = auto director = Director::getInstance();

director->getActionManager()->addAction(action,child2,true);

schedule(CC_SCHEDULE_SELECTOR(HelloWorld::unpause),3);//3秒后执行unpause方法

void HelloWorld::unpause(float dt){

//unschedule(CC_SCHEDULE_SELECTOR(HelloWorld::unpause));

auto node =getChildByTag(121);

auto director = Director::getInstance();

CCAction* action1 = CCRotateBy::create(1,360);

//director->getActionManager()->resumeTarget(node);

node->runAction(action1);

}

四、执行完某个动作后停止动作

auto child2 = "Images/grossini.png");

Vec2(r1.origin.x +300,r1.origin.y/2 +r1.size.height -300);

child2->setPosition(v2);

addChild(child2,111);

auto pmove = MoveBy::create(2,175); font-family:新宋体; font-size:9.5pt">Vec2(200,0));

auto pCallback = CallFunc::create(CC_CALLBACK_0(HelloWorld::stopAction,this));

auto pSequence = Sequence::create(pmove,pCallback,nullptr);

pSequence->setTag(121);

child2->runAction(pSequence);

void HelloWorld::stopAction(){

auto sprite =getChildByTag(111);

sprite->stopActionByTag(121);

}

五、停止所有动作，但保持某个动作

auto pmove1 = auto pmove2 = auto pSequenceMove = Sequence::createWithTwoActions(pmove1,pmove2);

auto pRepeatMove = RepeatForever::create(pSequenceMove);

pRepeatMove->setTag(111);

auto pScale1 = ScaleBy::create(2,1.5f);

auto pScale2 = auto pSequenceScale = Sequence::createWithTwoActions(pScale1,pScale2);

auto pRepeatScale = RepeatForever::create(pSequenceScale);

pRepeatScale->setTag(111);

auto pRotate = RotateBy::create(2,360);

auto pRepeateRotate = RepeatForever::create(pRotate);

auto pChild = Rect r = Vec2(r.origin.x + 300,r.size.height -300);

pChild->setPosition(v2);

addChild(pChild,1,112);

pChild->runAction(pRepeatMove);

pChild->runAction(pRepeatScale);

pChild->runAction(pRepeateRotate);

this->scheduleOnce((SEL_SCHEDULE)& HelloWorld::stopAction,4);

void HelloWorld::stopAction(float time){

auto sprite =getChildByTag(112);

sprite->stopAllActionsByTag(111);

}

六、一段时间后执行一次某个动作

auto child = "Images/grossini.png");

addChild(child,111);

child->setPosition(v2;

//child->runAction(ScaleBy::create(2,2));

auto director = Director::getInstance();

//director->getActionManager()->pauseTarget(child);//貌似不起作用

//child->runAction(RotateBy::create(2,360));

this->schedule(CC_SCHEDULE_SELECTOR(HelloWorld::resumeChild),8.0f);

void HelloWorld::resumeChild(float time){

//this->unschedule(CC_SCHEDULE_SELECTOR(HelloWorld::resumeChild)); //加上这句只执行一次，否则每8秒调用一次

auto child =getChildByTag(111);

auto director = Director::getInstance();

//director->getActionManager()->resumeTarget(child);//貌似不起作用

child->runAction(}

（编辑：李大同）

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