Does removing a Sprite remove any event listeners attached to it?

amaximov · April 2013

Say I have

 local mySprite = Sprite.new()
stage:addChild(mySprite)
mySprite:addEventListener(Event.ENTER_FRAME, someFunction)
stage:removeChild(mySprite)
mySprite = nil

Is it safe to do this or do I need to manually remove event listeners from a sprite or event dispatcher?

ar2rsawseen · April 2013

@amaximov in most cases (including your example) it is completely enough to only remove sprite object and all events will be removed when the object gets garbage collected.

There is only one specific case found by the @bowerandy that when you add event listener to global object, but pass data as some local object, the local object will not be garbage collected until the global object is not collected.

Here is more information on this topic: http://www.giderosmobile.com/forum/discussion/2818/a-warning-about-memory-management-complacency#Item_1

amaximov · April 2013

Thanks ar2rsawseen! I read the thread and I understood that if I pass on objects to the event listener that are not the object doing the listening, I need to be very careful about keeping references. For example if I have object A and B, I pass on object B to a listener on object A. simply nilling object B will have no effect because somewhere in the event system there is still a reference to object B? In this case I'd need to remove the listener from object A, and only then nil object B. Is this correct understanding?

ar2rsawseen · April 2013

@amaximov yes exactly like that

Howdy, Stranger!

Categories

In this Discussion

Top Posters

Does removing a Sprite remove any event listeners attached to it?

Comments

Howdy, Stranger!

Quick Links

Categories

In this Discussion

Top Posters

Does removing a Sprite remove any event listeners attached to it?

Comments