I’m having a problem removing native objects from the screen when using storyboard to change scenes. All other objects (e.g. display objects) are removed from the screen, but the native text fields that I am using remain on the screen after the new scene has been loaded. I have inserted these objects in the screenGroup, but they still persist.
Any suggestions?
Native objects CANNOT be inserted into displayGroups. Although you won’t get an error, the native object will remain separate from the group.
If you need to remove them on changing scene, you will most likely need to have a forward declaration at the top of the lua file, create the native object as and when you need it, and then delete it manually during the exitScene function.
Example:
--myScene.lua local myTextField createScene() myTextField = native.newTextField(0, 0, 200, 50) myTextField("userInput", myTextFieldListener) end exitScene() if myTextField then myTextField:removeSelf() myTextField = nil end --best to remove keyboard focus, in case keyboard is still on screen native.setKeyboardFocus(nil) endHi, this is very timely! I have a related question.
How about a native.showWebPopup() call? I use native.cancelWebPopup() when I’m done and the WebPopup disappears from view. How about memory though? Do I need to do anything else to release the memory used by this particular native object?
And native.showPopup(“mail”, options) … That one just goes away when the email is sent or cancelled. There is no call similar to native.cancelWebPopup() make it go away. Will the memory be cleared once the email popup goes away?
And finally how about things like native.setActivityIndicator( ) or even native.showAlert () ? once you send away the activity indicator or once the alert box is dismissed they all go away neatly right? I am not doing anything to clean up after them. Hope thats ok.
Thanks for your help. Regards,
Kerem
Thank you so much AlanPlantPot! Very helpful.
I’m still having an issue removing text boxes from my screen during a scene change. I am able to remove the text field entitled “address” but not the one entitled “comments.”
[lua]
function scene:enterScene(event)
--=========Address Field=================
address = native.newTextField(135, 10, display.contentWidth - 145, 24)
address.isEditable = true
if address_store ~= nil then
address.text = address_store
end
--=========Comment box==================
comments = native.newTextField(10, display.contentHeight - 55, display.contentWidth - 20, 45)
comments.isEditable = true
if comments_store ~= nil then
comments.text = comments_store
end
inspect_button:addEventListener(“tap”, chooseInspect)
action_button:addEventListener(“tap”, chooseAction)
tag_button:addEventListener(“tap”, chooseTag)
picButton:addEventListener( “tap”, takePic )
end
function scene:exitScene(event)
address_store = address.text
address:removeSelf()
address = nil
comments_store = comments.text
comments:removeSelf()
comments = nil
native.setKeyboardFocus(nil)
inspect_button:removeEventListener(“tap”, chooseInspect)
action_button:removeEventListener(“tap”, chooseAction)
tag_button:removeEventListener(“tap”, chooseTag)
picButton:removeEventListener( “tap”, takePic )
end
[/lua]
The problem is not removing “Text” only
The problem is "“ROMOVING ANY IMAGE ALSO”
I have this problem of removing a .png image on my scene and NO ONE KNOWS HOW TO DO IT.
I will keep trying to find out the solution, UNLESS IS A PROGRAM GLITCH OR A BUG THAT HAS NO SOLUTION.
But IF I CAN FIND THE SOLUTION I WILL POST A BIG VIDEO IN YOUTUBE TO HELP ALL THE PEOPLE WITH THE SAME PROBLEM THAN ME AND ANOTHER 40 THOUSANDS MORE.
Victor, please do not post in ALL CAPS. It’s considered shouting and is not permitted on the forums.
Btw, solved the problem. I had forgotten to delete my text box declaration elsewhere in the program.
Hi Rob.
I am sorry, I did not know that – thank you for letting me know.
Remember that I’m learning, I will not use all caps again.
Victor
@helloworld2013d You’ll have to give us some more info about the problem you are having, ideally post your code and someone will be able to see where you are going wrong. There’s certainly no general Corona bug when removing any .png image otherwise myself and many others would never have been able to create any apps. My initial guess is that you may have a scope issue. If you create a local variable in one function (e.g. the createScene function), you cannot remove it in another function(e.g. the exitScene function).
this is my complete code Alan
– Version 1.0
– --==***************************************************************************+±- –
local storyboard = require( “storyboard” )
local widget = require “widget”
local scene = storyboard.newScene()
local wrongSound = audio.loadSound( “wrongSound.mp3”)
– --==******************[FUNCTIONS TO GO TO ANOTHER SCENE]**********************+±- –
local function buttonHome()
storyboard.gotoScene( “home”, “crossFade”, 1000 )
return true
end
local function buttonApple()
storyboard.gotoScene( “learn1”, “crossFade”, 1000 )
return true
end
local function buttonBulbHome()
storyboard.gotoScene( “ending”, “crossFade”, 1000 )
return true
end
local function buttonRound1()
storyboard.gotoScene( “wrong1”, “crossFade”, 1000 )
audio.play(wrongSound)
return true
end
local function buttonRound2()
storyboard.gotoScene( “wrong1”, “crossFade”, 1000 )
audio.play(wrongSound)
return true
end
local function buttonRound3()
storyboard.gotoScene( “level1Q6”, “crossFade”, 1000 )
return true
end
local function buttonRound4()
storyboard.gotoScene( “wrong1”, “crossFade”, 1000 )
audio.play(wrongSound)
return true
end
local function buttonRound5()
storyboard.gotoScene( “wrong1”, “crossFade”, 1000 )
audio.play(wrongSound)
return true
end
– --==**************************[CREATE SCENE]**********************************+±- –
function scene:createScene( event )
local group = self.view
local background = display.newImage( “backgroundLevel1Q5.png” )
buttonHome = widget.newButton{
defaultFile=“buttonHome.png”,
onRelease = buttonHome
}
buttonHome.x = 522
buttonHome.y = 655
buttonApple = widget.newButton{
defaultFile=“buttonApple.png”,
onRelease = buttonApple
}
buttonApple.x = 420
buttonApple.y = 710
buttonBulbHome = widget.newButton{
defaultFile=“buttonBulbHomeRelease.png”,
overFile=“buttonBulbHomeOver.png”,
onRelease = buttonBulbHome
}
buttonBulbHome.x = 615
buttonBulbHome.y = 685
buttonRound1 = widget.newButton{
defaultFile=“button2Counts.png”,
onRelease = buttonRound1
}
buttonRound1.x = 199
buttonRound1.y = 312
buttonRound2 = widget.newButton{
defaultFile=“button1Count.png”,
onRelease = buttonRound2
}
buttonRound2.x = 700
buttonRound2.y = 432
buttonRound3 = widget.newButton{
defaultFile=“button4Counts.png”,
onRelease = buttonRound3
}
buttonRound3.x = 800
buttonRound3.y = 300
buttonRound4 = widget.newButton{
defaultFile=“button3Counts.png”,
onRelease = buttonRound4
}
buttonRound4.x = 200
buttonRound4.y = 600
buttonRound5 = widget.newButton{
defaultFile=“buttonHalfCount.png”,
onRelease = buttonRound5
}
buttonRound5.x = 323
buttonRound5.y = 444
---------------------------------------------------------------------insert into group----
group:insert ( background )
group:insert ( buttonHome )
group:insert ( buttonApple )
group:insert ( buttonBulbHome )
group:insert ( buttonRound1 )
group:insert ( buttonRound2 )
group:insert ( buttonRound3 )
group:insert ( buttonRound4 )
group:insert ( buttonRound5 )
end
– --==***************************[ENTER SCENE]**********************************+±- –
function scene:enterScene( event )
local group = self.view
local quarterNote = display.newImage( “wholeNote.png” )
quarterNote.x = 390
quarterNote.y = 532
transition.to(quarterNote, {x=987 , y=532, time=5000})
group:insert ( quarterNote )
end
– --==***************************[EXIT SCENE]**********************************+±- –
function scene:exitScene( event )
local group = self.view
end
– --==**************************[DESTROY SCENE]*********************************+±- –
function scene:destroyScene( event )
local group = self.view
if buttonHome then
buttonHome:removeSelf()
buttonHome = nil
end
if buttonApple then
buttonApple:removeSelf()
buttonApple = nil
end
if buttonBulbHome then
buttonBulbHome:removeSelf()
buttonBulbHome = nil
end
if buttonRound1 then
buttonRound1:removeSelf()
buttonRound1 = nil
end
if buttonRound2 then
buttonRound2:removeSelf()
buttonRound2 = nil
end
if buttonRound3 then
buttonRound3:removeSelf()
buttonRound3 = nil
end
if buttonRound4 then
buttonRound4:removeSelf()
buttonRound4 = nil
end
if buttonRound5 then
buttonRound5:removeSelf()
buttonRound5 = nil
end
end
scene:addEventListener( “createScene”, scene )
scene:addEventListener( “enterScene”, scene )
scene:addEventListener( “exitScene”, scene )
scene:addEventListener( “destroyScene”, scene )
return scene
in the enterScene I have the image display. and this scene is – level 5 or level5.lua
you can see the transition.to point A to point B without any problems and everything works fine.
so I keep playing and going to another level level 6, level 7, level 8 but when I come back to level 5 …
As soon as I see the scene, the image (quarter note) is there already in point B
and a new image quarter note start to move and going from point A to point B, and you can see two images.
I would like the scene to start normal like the first time, every time.
I hope this will help you understand my problem. And I hope that you can help me.
Thank you Alan.
Victor
Native objects CANNOT be inserted into displayGroups. Although you won’t get an error, the native object will remain separate from the group.
If you need to remove them on changing scene, you will most likely need to have a forward declaration at the top of the lua file, create the native object as and when you need it, and then delete it manually during the exitScene function.
Example:
--myScene.lua local myTextField createScene() myTextField = native.newTextField(0, 0, 200, 50) myTextField("userInput", myTextFieldListener) end exitScene() if myTextField then myTextField:removeSelf() myTextField = nil end --best to remove keyboard focus, in case keyboard is still on screen native.setKeyboardFocus(nil) endHi, this is very timely! I have a related question.
How about a native.showWebPopup() call? I use native.cancelWebPopup() when I’m done and the WebPopup disappears from view. How about memory though? Do I need to do anything else to release the memory used by this particular native object?
And native.showPopup(“mail”, options) … That one just goes away when the email is sent or cancelled. There is no call similar to native.cancelWebPopup() make it go away. Will the memory be cleared once the email popup goes away?
And finally how about things like native.setActivityIndicator( ) or even native.showAlert () ? once you send away the activity indicator or once the alert box is dismissed they all go away neatly right? I am not doing anything to clean up after them. Hope thats ok.
Thanks for your help. Regards,
Kerem
Thank you so much AlanPlantPot! Very helpful.
I’m still having an issue removing text boxes from my screen during a scene change. I am able to remove the text field entitled “address” but not the one entitled “comments.”
[lua]
function scene:enterScene(event)
--=========Address Field=================
address = native.newTextField(135, 10, display.contentWidth - 145, 24)
address.isEditable = true
if address_store ~= nil then
address.text = address_store
end
--=========Comment box==================
comments = native.newTextField(10, display.contentHeight - 55, display.contentWidth - 20, 45)
comments.isEditable = true
if comments_store ~= nil then
comments.text = comments_store
end
inspect_button:addEventListener(“tap”, chooseInspect)
action_button:addEventListener(“tap”, chooseAction)
tag_button:addEventListener(“tap”, chooseTag)
picButton:addEventListener( “tap”, takePic )
end
function scene:exitScene(event)
address_store = address.text
address:removeSelf()
address = nil
comments_store = comments.text
comments:removeSelf()
comments = nil
native.setKeyboardFocus(nil)
inspect_button:removeEventListener(“tap”, chooseInspect)
action_button:removeEventListener(“tap”, chooseAction)
tag_button:removeEventListener(“tap”, chooseTag)
picButton:removeEventListener( “tap”, takePic )
end
[/lua]
The problem is not removing “Text” only
The problem is "“ROMOVING ANY IMAGE ALSO”
I have this problem of removing a .png image on my scene and NO ONE KNOWS HOW TO DO IT.
I will keep trying to find out the solution, UNLESS IS A PROGRAM GLITCH OR A BUG THAT HAS NO SOLUTION.
But IF I CAN FIND THE SOLUTION I WILL POST A BIG VIDEO IN YOUTUBE TO HELP ALL THE PEOPLE WITH THE SAME PROBLEM THAN ME AND ANOTHER 40 THOUSANDS MORE.
Victor, please do not post in ALL CAPS. It’s considered shouting and is not permitted on the forums.
Btw, solved the problem. I had forgotten to delete my text box declaration elsewhere in the program.
Hi Rob.
I am sorry, I did not know that – thank you for letting me know.
Remember that I’m learning, I will not use all caps again.
Victor
@helloworld2013d You’ll have to give us some more info about the problem you are having, ideally post your code and someone will be able to see where you are going wrong. There’s certainly no general Corona bug when removing any .png image otherwise myself and many others would never have been able to create any apps. My initial guess is that you may have a scope issue. If you create a local variable in one function (e.g. the createScene function), you cannot remove it in another function(e.g. the exitScene function).