Why current scene in cocos2dx has no children when accessed from outside scene class?

Question

I want to access a sprite in a scene, but I cannot get the running scene from outside the scene class.

The scene is created using:

Scene* MyScene::createScene() { auto scene = Scene::create(); auto layer = MyScene::create(); scene->addChild(layer); return scene; } bool MyScene::init() { this->addChild(sprite,100, 1234); }

But if I then access the running scene from outside the class, it has no children.

Director::getInstance()->getRunningScene() //should be the MyScene instance with sprite children, but has no children.

I also tried giving the scene layer a tagname, but with the same result.

scene->addChild(layer,100,TAGNAME); ... Director::getInstance()->getRunningScene()->getChildByTag(TAGNAME) //returns NULL because getRunningScene has no children.

The only way I can access the scene is making a static reference in my AppDelegate, but this doesn't seem a proper way. How can I get the current scene correctly from outside the class?

\$\begingroup\$ I think this question is duplicate of this one. \$\endgroup\$

Emadpres
– Emadpres

2015-05-24 05:19:27 +00:00
Commented May 24, 2015 at 5:19 — Emadpres
– Emadpres, Commented May 24, 2015 at 5:19

Vaillancourt · Accepted Answer · 2016-03-25 13:45:03Z

Your layer is a child of scene.

Try a Director::getInstance()->getRunningScene()->getChildrenCount() and you will find only 1 child: layer

You will have to search the children of layer to find the one you need :)

I would use:

auto scene = Scene::create(); auto layer = HelloWorld::create(); scene->addChild(layer,0,999); // add layer as a child to scene

In the init():

this->addChild(yourNode,100,TAGNAME); //this points to layer!

To find yourNode with tag

auto scene = cocos2d::Director::getInstance()->getRunningScene(); auto layer = scene->getChildByTag( 999 ); auto node = layer->getChildByTag( TAGNAME );

I think this will answer your question.

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