Invalid Native Object reported when creating CCSprite in CCLayer::init and accessing it in CCLayer::update

cocos2d-x JavaScript
#1

I have a CCLayer with CCSprites in it. When I create and add sprites to the layer in init, everything works fine. If I create sprites in init and access them in update, without adding them to the layer, I get an error: “Cocos2d: JS: Invalid Native Object”. The error is reported for the line accessing the given sprite.

Below is example code giving the error:

var SpriteLayer = cc.Layer.extend({

ctor: function() {
this.*super;
cc.associateWithNative;
this.init;
},
init: function {
this.*super();

cc.SpriteFrameCache.getInstance().addSpriteFrames(“spriteSheet.plist”);
this.*sprite = cc.Sprite.createWithSpriteFrameName;
// When this is uncommented this works
//this.addChild;
this.scheduleUpdate;
},
update: function {
this.*sprite.setPosition(cc.p(120,120));
}
});

I am using XCode and the problem appears in simulators and on device. I am using Cocos2d-x v2.1rc0-x-2.1.2 with the hotfix. This works with the HTML5 version.

#2

If you only want to save node after it’s created, you should invoke this._sprite.retain; and when you don’t need it, please call this._sprite.release;.
This is because we are using the lifecycle of cpp to control the lifecycle of js.
When a cocos2d object is created, it’ll be an autorelease object. If you don’t add it to any nodes, it will be released at the end of current mainloop.

#3

Thank you for your reply!

I thought it sounds like an autorelease issue, but I didn’t realize it actually is a feature. I am still new to Cocos2D-X, and haven’t seen this in the documentation. Looking forward to seeing C2DX evolve, it’s an awesome platform!