Fun with Sprites – Sky Defense - Cocos2d-x by Example Beginner's Guide - page 125

String::createWithFormat("explosion_small%i.png", i);
auto frame =
SpriteFrameCache::getInstance()->getSpriteFrameByName(name->getCString());
animation->addSpriteFrame(frame);
}
animation->setDelayPerUnit(0.5 / 7.0f);
animation->setRestoreOriginalFrame(true);
_explosion = Sequence::create(
Animate::create(animation),
CallFuncN::create(CC_CALLBACK_1(GameLayer::animationDone,
this)), nullptr);
_explosion->retain();