cocos2dx中更新函数有两种,一种是默认的,通过scheduleUpdate()开启使用,unscheduleUpdate()关闭。每帧会调用一次。
另一种通过 schedule(schedule_selector(HelloWorld::myUpdate),1.f)开启使用, unschedule(schedule_selector(HelloWorld::myUpdate))关闭。
关闭所有unscheduleAllSelectors() 更新函数
新建工程,testUpdate
修改HelloWorldScene.h
#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__
#include "cocos2d.h"
class HelloWorld : public cocos2d::CCLayer
{
public:
// Method 'init' in cocos2d-x returns bool, instead of 'id' in cocos2d-iphone (an object pointer)
virtual bool init();
// there's no 'id' in cpp, so we recommend to return the class instance pointer
static cocos2d::CCScene* scene();
void update(float dt);
void myUpdate(float dt);
// preprocessor macro for "static create()" constructor ( node() deprecated )
CREATE_FUNC(HelloWorld);
};
#endif // __HELLOWORLD_SCENE_H__
#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"
using namespace cocos2d;
using namespace CocosDenshion;
CCScene* HelloWorld::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();
// 'layer' is an autorelease object
HelloWorld *layer = HelloWorld::create();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
return false;
}
CCSprite *sp=CCSprite::create("Icon.png");
sp->setPosition(ccp(80,200));
addChild(sp,0,922);
//更新
scheduleUpdate();
CCSprite *sp2=CCSprite::create("Icon.png");
sp2->setPosition(ccp(80,50));
addChild(sp2,0,921);
//更新
schedule(schedule_selector(HelloWorld::myUpdate), 1.f);
return true;
}
void HelloWorld::update(float dt)
{
//停止更新
// unscheduleUpdate();
CCSprite*sp =(CCSprite*)this->getChildByTag(922);
if(sp->getPositionX()<260){
sp->setPosition(ccpAdd(sp->getPosition(), ccp(1,1)));
}else{
sp->setPosition(ccpAdd(sp->getPosition(), ccp(1,-1)));
}
}
void HelloWorld::myUpdate(float dt)
{
//停止更新
// unschedule(schedule_selector(HelloWorld::myUpdate));
CCSprite*sp =(CCSprite*)this->getChildByTag(921);
if(sp->getPositionX()<260){
sp->setPosition(ccpAdd(sp->getPosition(), ccp(1,1)));
}else{
sp->setPosition(ccpAdd(sp->getPosition(), ccp(1,-1)));
}
}