cocos2d-x的CCArray用法

概述一.基本用法 1.声明初始化变量 C++ 1 2 3 cocos2d :: CCArray * pArray ; pArray = CCArray :: createWithCapacity ( 100 ) ; pArray -> retain ( ) ; //如果保留成员变量的话,此处必须retain,否则会崩溃,因为标记了autorelease 2.添加元素到数组 C++ 1 2 CCSpri

一.基本用法

1.声明初始化变量

C++

1 2 3

cocos2d :: CCArray * pArray ; pArray = CCArray :: createWithCapacity ( 100 ) ; pArray -> retain ( ; //如果保留成员变量的话,此处必须retain,否则会崩溃,因为标记了autorelease

2.添加元素到数组

C++

1 2	CCSprite * pRet = CCSprite :: create ( "test.png" ) ; pArray -> addobject ( pRet ; //将pRet添加到数组0位置,此处会调用一次pRet的retain

3.删除元素

1 2 3 //下面这两个函数都能够实现删除元素的效果 pArray removeObject ( pRet //第二参数为是否调用release,默认为true pArray removeObjectAtIndex 0 //删除o位置上的元素

4.遍历

1).使用ccarray中的宏进行遍历

1 2 3 4 5 6 7 8 9 10 11 12 13 </td> <td > <span >CCObject</span> <span ></span> <span >pObj</span> <span >;</span> <span >//正向</span> <span >CCARRAY_FOREACH</span> <span >(</span> <span >s_pBulletArray</span> <span >,</span> <span >pObj</span> <span >)</span> <span >{</span> <span ></span> <span >CMapNode</span> <span >pNode</span> <span >=</span> <span >(</span> <span >CMapNode</span> <span >*</span> <span >)</span> <span >pObj</span> <span >;</span> <span ></span> <span >//...</span> <span >}</span> //逆向</span> <span >CCARRAY_FOREACH_REVERSE</span> <span >)</span> {</span> <span >;</span> //...</span> <span >}</span> </td> </tr> </tbody> </table> <p > 2).for循环遍历</p> <textarea wrap="off" data-settings="" readonly > 1 2 3 4 </td> <td > <span >for</span> <span > </span> <span >(</span> <span >unsigned</span> <span > </span> <span >int</span> <span > </span> <span >i</span> <span > </span> <span >=</span> <span > </span> <span >;</span> <span > </span> <span >i</span> <span ><</span> <span >s_pBulletArray</span> <span >count</span> <span >++</span> <span >i</span> <span >)</span> <span > </span> <span >{</span> <span ></span> <span >CCNode</span> <span >pObj</span> <span >=</span> <span >(</span> <span >CCNode</span> <span >*</span> <span >)</span> <span >s_pBulletArray</span> <span >objectAtIndex</span> <span >(</span> <span >i</span> <span >;</span> }</span> </td> </tr> </tbody> </table> <p ></p> <span >二.注意事项</span> <p >1.创建一个CCArray后如果不是立刻使用的话一定要调用retain,增加引用计数,不然会被自动释放!</p> <p >2.删除CCArray中的元素时最好默认内部调用一次release,不然可能会内存泄露!</p> <p >3.遍历时删除元素</p> <textarea wrap="off" data-settings="" readonly > 1 2 3 4 5 6 7 8 9 10 11 </td> <td > <span >//判断条件删除时,最好能够逆向遍历删除,这样不会漏掉任何元素</span> <span >for</span> <span ></span> <span >(</span> <span >int</span> <span >i</span> <span ></span> <span >=</span> <span ></span> <span >arr</span> <span >count</span> <span >(</span> <span >)</span> <span >-</span> <span >1</span> <span >;</span> <span ></span> <span >i</span> <span >>=</span> <span >0</span> <span >--</span> <span >i</span> <span >)</span> <span ></span> <span >{</span> </span> <span >CMonster</span> <span >pObj</span> <span >(</span> <span >CMonster</span> <span >)</span> <span >arr</span> <span >objectAtIndex</span> <span >(</span> <span >i</span> <span >;</span> <span ></span> <span >bool</span> <span >isCollIDe</span> <span >false</span> <span >;</span> rect</span> <span >.</span> <span >intersectsRect</span> <span >(</span> <span >pObj</span> <span >getCollIDeRect</span> <span >;</span> <span ></span> <span >if</span> <span >(</span> <span >isCollIDe</span> <span >)</span> {</span> <span >removeObject</span> <span >(</span> <span >pObj</span> <span >;</span> }</span> <span >}</span> </td> </tr> </tbody> </table> <p > </p> <span >三.什么时候会用到CCArray?</span> <p > 1.每一个CCNode的children本质就是一个CCArray,这样我们就可以通过getChildren()获得array,进行 *** 作!</p> <p > </p> <p > 2.对于CCSequence如果只有到运行时才能知道有个少个动作时,我们就可以声明一个CCArray然后将动作addobject(),最后通过一个array来创建CCSequence,例如下面这段代码:</p> <textarea readonly> 1 2 3 4 5 6 7 8 9 10 11 12 //所有的路径节点 CCArray * array CCArray createWithCapacity ( 20 ; float dt = 1 / ( m_pProperty -> fMoveSpeed ; CCPoint point ( ; ( UINT i 0 ; i < CGlobal getGameMap m_PathNode size ; ++ i ) { array ( CCMoveto ( dt point ; } //移动完毕的回调 CCCallFunc ( this callfunc_selector CMonster :: onArrive ; CCSequence pAct CCSequence array ;

3.对于一个CCSprite,我们肯定需要把它addChild到parent上,这样他才能显示出来,这样的话parent上就会有好多child,但是我们要遍历只是其中的一部分(例:场景的地图上有好多种花,我们都会把它们添加到同一个parent上,这时候策划说其中的一种花会被怪物踩死?纳尼….,这个时候我们就需要唉将能被踩死的花加入到parent上时同时加入到一个CCArray中去….),这样我们用的时候遍历这个数组就可以了,而不是遍历这个children!

4.多谢@子龙山人 大大的添加,CCArray还可以内存预分配，比如预先生成一堆子d，然后加到CCArray中，再从这个CCArray中去重用子d。这样可以提高游戏效率。消失的子d只需要设置为Invisible就可以了。这个在做射击类游戏中会大量使用的!

5.还有其他用法?发评论告诉我!

(全文完)

转载自http://blog.justbilt.com/25/

总结

以上是内存溢出为你收集整理的cocos2d-x的CCArray用法全部内容，希望文章能够帮你解决cocos2d-x的CCArray用法所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。