how to go to previous scene

[jjclinton15]

Hello people,

My name is Joshua and I’m stuck with quite a problem for my new android game app.

I know how to switch to specific scenes, but I don’t know how to go to the previous scene.

I have this game and whenever you are gameover you will be sent to a “gameover” scene, however in the “gameover” scene there are 2 buttons, a “back to menu” button and a “Try again” button.

On the try agin button I would like to sent the player to the previous scene, that includes the level the player was.

I could solve this problem by copying and pasting the “gameover” scene over and over after each level, but this wil consume a lot of data!

I hope you guys can help me with this problem.

Thanks in advance!

[rob]

There are several ways to pass data between scenes. They include:

1. Use the Composer APIs to get the previous scene name:

   local prevScene = composer.getSceneName( “previous” ) – Later… composer.gotoScene( prevScene )

2. Using params with the composer.gotoScene() call. With this you could pass in the  name of the previous scene.

   local params = { currentLevel = 3, gameScene = “level3” } composer.gotoScene( “gameover”, { params = params }

Then in your gameover scene near the top:

local currentLevel local gameScene

Later in your scene:show() event function:

function scene:show( event )     local sceneGroup = self.view     local params = event.params     if event.phase == "did" then         currentLevel = params.currentLevel         gameScene = params.gameScene     end end

Now when you need to go back to the game level it’s a simple composer.gotoScene( gameScene )

3. Use the composer API’s .setVariable() and .getVariable() to pass the data. In the game level:

   composer.setVariable( “gameScene”, “level3” )

In the gameover scene:

local gameScene = composer.getVariable( "gameScene" ) composer.gotoScene( gameScene )

4. Use a app wide data module. To learn more about this, please read: http://coronalabs.com/blog/2013/05/28/tutorial-goodbye-globals/

Create a new Lua file called “mydata.lua”

local M = {} return M

In your level file:

local mydata = require( "mydata" ) mydata.gameScene = "level3"

In your gameover scene:

local mydata = require( "mydata" ) scene.gotoScene( mydata.gameScene )

Personally I prefer the last way. I have this data table that I may available in all my scenes. Its like globals with out the problem of using globals. All four are perfectly valid ways of doing what you want to do.

Rob

[rob]

There are several ways to pass data between scenes. They include:

1. Use the Composer APIs to get the previous scene name:

   local prevScene = composer.getSceneName( “previous” ) – Later… composer.gotoScene( prevScene )

2. Using params with the composer.gotoScene() call. With this you could pass in the  name of the previous scene.

   local params = { currentLevel = 3, gameScene = “level3” } composer.gotoScene( “gameover”, { params = params }

Then in your gameover scene near the top:

local currentLevel local gameScene

Later in your scene:show() event function:

function scene:show( event )     local sceneGroup = self.view     local params = event.params     if event.phase == "did" then         currentLevel = params.currentLevel         gameScene = params.gameScene     end end

Now when you need to go back to the game level it’s a simple composer.gotoScene( gameScene )

3. Use the composer API’s .setVariable() and .getVariable() to pass the data. In the game level:

   composer.setVariable( “gameScene”, “level3” )

In the gameover scene:

local gameScene = composer.getVariable( "gameScene" ) composer.gotoScene( gameScene )

4. Use a app wide data module. To learn more about this, please read: http://coronalabs.com/blog/2013/05/28/tutorial-goodbye-globals/

Create a new Lua file called “mydata.lua”

local M = {} return M

In your level file:

local mydata = require( "mydata" ) mydata.gameScene = "level3"

In your gameover scene:

local mydata = require( "mydata" ) scene.gotoScene( mydata.gameScene )

Personally I prefer the last way. I have this data table that I may available in all my scenes. Its like globals with out the problem of using globals. All four are perfectly valid ways of doing what you want to do.

Rob