给敌人精灵创建帧动画

//给精灵创建帧动画
Animation* EnemyBase::createAnimation(std::string prefixName, int framesNum, float delay)  
{  
// 1  
    Vector<SpriteFrame*> animFrames;     
    // 2   
for (int i = 1; i <= framesNum; i++)  
    {  
        char buffer[20] = { 0 };  
        sprintf(buffer, "_%i.png",  i);  
        std::string str =  prefixName + buffer;  
        auto frame = SpriteFrameCache::getInstance()->getSpriteFrameByName(str);  
        animFrames.pushBack(frame);  
    }  
    // 3  
    return Animation::createWithSpriteFrames(animFrames, delay);  
}