Corona Display Groups Creation and Removal in Storyboard

Getting Started Newbie Questions
#1

Hello,

I’m having some trouble with display groups using storyboard. Anyway, I have 1 display group that I create outside of createscene().

local foreground = display.newGroup()
 

In createscene(),  I insert it to the scene’s group so that it becomes a child of it.

group:insert(foreground)
 

In exitscene(), I do foreground:removeSelf(0

This properly removes the foreground and all of its objects. However, because I declared the display group outside of createscene(), I don’t know how to make the scene declare the groups again when I get back to the scene, since I’m declaring it outside of createscene().

I can’t put local foreground = display.newGroup() inside of createscene because existscene() won’t detect it, and I heard it’s bad practice to make it global.

So I was looking for some suggestions on how I could approach this particular problem i have.

Thanks.

#2

Do you need scenes to stay in memory when they’re not being used? 

If not, just call this at the top of each scene, then when you go back to a scene it will load from scratch as before.

[lua]

 storyboard.removeAll()

[/lua]

You don’t need to do foreground:removeSelf() in exitscene() either, it will automatically be removed when you goto another scene.

#3

Unfortunately I need a few oop scenes and variables open for re-using. RemoveAll() removes everything essentially and it causes problems on reload.

#4

I don’t use the “local” prefix for my storyboard sub-groups and I call them all in the create scene. I nest them into my main storyboard scene group, so once that’s disposed of at the end of the scene all the other groups are also automatically removed.

#5

I see. I tend to keep everything in each scene self-contained. If I need variables or functions available throughout the app, I create a functions.lua and globals.lua file to hold those.

i.e.

[lua]

local glo = {}

glo.sound = 0.7

glo.touchAllowed = false

return glo

[/lua]

Then I put this in main.lua:

[lua]

glo = require(“globals”)  

[/lua]

#6

That helped. Thanks.

#7

Do you need scenes to stay in memory when they’re not being used? 

If not, just call this at the top of each scene, then when you go back to a scene it will load from scratch as before.

[lua]

 storyboard.removeAll()

[/lua]

You don’t need to do foreground:removeSelf() in exitscene() either, it will automatically be removed when you goto another scene.

#8

Unfortunately I need a few oop scenes and variables open for re-using. RemoveAll() removes everything essentially and it causes problems on reload.

#9

I don’t use the “local” prefix for my storyboard sub-groups and I call them all in the create scene. I nest them into my main storyboard scene group, so once that’s disposed of at the end of the scene all the other groups are also automatically removed.

#10

I see. I tend to keep everything in each scene self-contained. If I need variables or functions available throughout the app, I create a functions.lua and globals.lua file to hold those.

i.e.

[lua]

local glo = {}

glo.sound = 0.7

glo.touchAllowed = false

return glo

[/lua]

Then I put this in main.lua:

[lua]

glo = require(“globals”)  

[/lua]

#11

That helped. Thanks.