SceneManager transition causing app to crash

jmrmbz · July 2013

Hello all. I'm trying to see about getting a random transition to occur between switching scenes by doing the following:

In main.lua

-- defines the scenemanager's scenes
scenemanager = SceneManager.new({
	["mainmenu"] = mainmenu,
	["gamemode"] = gamemode,
	["game"] = game,
	["contact"] = contact,
	["options"] = options,
})
 
transitions = {
	SceneManager.fade,
	SceneManager.crossFade,
	SceneManager.flip,
	SceneManager.flipWithFade,
	SceneManager.flipWithShade,
	SceneManager.moveFromLeft,
	SceneManager.moveFromRight,
	SceneManager.moveFromBottom,
	SceneManager.moveFromTop,
	SceneManager.moveFromLeftWithFade,
	SceneManager.moveFromRightWithFade,
	SceneManager.moveFromBottomWithFade,
	SceneManager.moveFromTopWithFade,
	SceneManager.overFromLeft,
	SceneManager.overFromRight,
	SceneManager.overFromBottom,
	SceneManager.overFromTop,
	SceneManager.overFromLeftWithFade,
	SceneManager.overFromRightWithFade,
	SceneManager.overFromBottomWithFade,
	SceneManager.overFromTopWithFade,
}
 
-- get a random transition from the transition table
transition = transitions[math.random(#transitions)] CAUSES CRASHING SOMETIMES
 
 
-- adds the manager to the stage
stage:addChild(scenemanager)
 
-- go to the main menu scene
scenemanager:changeScene("mainmenu", 1, transition, easing.outBack)

Sometimes when the scene changes it causes the app to crash with an error:
"classes/scenemanager.lua:327: attempt to call field 'transition' (a nil value)
stack traceback:
classes/scenemanager.lua:327: in function

However if I change the line to "transition = SceneManager.flipWithFade" it seems to run fine. Anyone has any ideas. Sorry about posting the code the way I did. I'm not sure how to post it so it looks correct.

hgvyas123 · July 2013

not sure but most likely from the transitions array one of the value is supposed to be nil
in this case find out that value by

transition = transitions[1] use all the numbers upto #transitions

if you think you are using old version you can get latest version from https://github.com/gideros/Scene-Manager

jmrmbz · July 2013

Thanks @hgvyas123 I'll try out and see which one is coming up as nil. I just checked and I'm an using the latest version.

BTW how do I post a comment and have the code show up properly?

hgvyas123 · July 2013

BTW how do I post a comment and have the code show up properly?

http://giderosmobile.com/forum/discussion/742/problem-with-shape-position#Item_2

jmrmbz · July 2013

@hgvyas123 Thanks!!!

ArtLeeApps · July 2013

@jmrmbz, I'm on a train so i can't test the theory, but take the last comma out of the transitions array, after the last item, i reckon it's counting 1 extra item.

ar2rsawseen · July 2013

Just promoting a new feature

http://members.giderosmobile.com/knowledgebase.php?action=displayarticle&id=41

hgvyas123 · July 2013

alright i had chked which one is nil

this one is found guilty
----------> SceneManager.crossFade it should be SceneManager.crossfade

jmrmbz · July 2013

Thanks @hgvyas123 for finding which one was causing the issue!!

>-

@ar2rsaween I actually got that from the main.lua that's in the sceneManager code on Github. There it shows as "crossFade". In any case can I be forgiven for not using the KB?!!!!

if not kbSearch() then
      self:isPunished()
else
      self:isRewarded()
end

ar2rsawseen · July 2013

@jmrmbz I've just implemented KB, so this time you're forgiven

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