Question

据我所知，它不存在。

    CCArray *array = CCArray::create();
    CCArrayEnumerator *enumerator = array->createEnumerator();
    ...

    CCObject *nextObjectOrNull = enumerator->nextObject();
    CCObject *currentObjectOrNull = enumerator->peekCurrentObject();

这个类会使我的代码更简单，如果没有人编码，我会立刻做。但我没有找到任何有关此课程需求的请求或论坛帖子。这很奇怪。

Answer 1

您可以编写自己的代码，但已经有一个可用于此的宏。

这是伪代码：

CCArray *array = this->getChildren();  

CCObject* currentObject = NULL;  
CCARRAY_FOREACH(array , currentObject )  
{  
    CCNode *node = (CCNode*)currentObject;
}

Answer 2

我写了一个简单的类，它完成了这项工作。欢迎提出建议。

CCArrayEnumerator.h：

#include "cocos2d.h"

class CCArrayEnumerator : public cocos2d::CCObject{

public:
    static CCArrayEnumerator* create(cocos2d::CCArray* array);
    cocos2d::CCObject* nextObject();
    cocos2d::CCObject* peekCurrentObject();
private:
    cocos2d::CCArray* _array;
    CCArrayEnumerator();
    ~CCArrayEnumerator();
    virtual bool init(cocos2d::CCArray* array);

    int _currentIndex;
};

CCArrayEnumerator.cpp：

#include "CCArrayEnumerator.h"
USING_NS_CC;

CCArrayEnumerator* CCArrayEnumerator::create(cocos2d::CCArray* array){
    CCArrayEnumerator *pRet = new CCArrayEnumerator();
    if (pRet && pRet->init(array))
    {
        pRet->autorelease();
        return pRet;
    }
    else
    {
        CC_SAFE_DELETE(pRet);
        return NULL;
    }
}

    cocos2d::CCObject* CCArrayEnumerator::nextObject(){
    CCObject *retval = NULL;

    if(_array->count() > _currentIndex + 1){
        _currentIndex++;
        retval = _array->objectAtIndex(_currentIndex);
    }

    return retval;
}

cocos2d::CCObject* CCArrayEnumerator::peekCurrentObject(){
    CCObject *retval = NULL;

    if(_currentIndex != -1 && _array->count() > _currentIndex){
        retval = _array->objectAtIndex(_currentIndex);
    }

    return retval;
}

CCArrayEnumerator::CCArrayEnumerator():
 _array(NULL)
,_currentIndex(-1){

}

CCArrayEnumerator::~CCArrayEnumerator(){
    if(_array){
        _array->release();
        _array = NULL;
    }
}

bool CCArrayEnumerator::init(cocos2d::CCArray* array){

    // Superclass CCObject has no init.

    CCAssert(_array == NULL,"CCArrayEnumerator is already initialized.");

    _array = array;
    _array->retain();

    return true;
}

CCArray枚举器对象

2 个答案: