如何在场景结束时删除这些DisplayObject？

Question

我希望这个场景中的气球（即DisplayObject）在场景结束时消失。我已将它们作为第一个参数传递给local sceneGroup = scene.view，并将其作为第一个参数传递给display.newImageRect()，并认为这将足以让它们在底部的destroy.scene位中列出。然而，当它转换到下一个场景时，他们仍然在那里。为什么这些DisplayObject不会被删除？

local composer = require("composer") 

local scene = composer.newScene() 


local Balloons 

local positioninsheetOptions = 100 


local sheetOptions = 
{ 
    frames = 
    { 
     { 
      x = 0, 
      y = 0, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*2, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*3, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*4, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*5, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*6, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*7, 
      width = 71, 
      height = 100 
     }, 
     { 
      x = 0, 
      y = positioninsheetOptions*8, 
      width = 71, 
      height = 100 
     }, 

     { 
      x = 0, 
      y = positioninsheetOptions*9, 
      width = 71, 
      height = 100 
     }, 

      { 
      x = 0, 
      y = positioninsheetOptions*10, 
      width = 71, 
      height = 100 
     }, 


      { 
      x = 0, 
      y = positioninsheetOptions*11, 
      width = 71, 
      height = 100 
     }, 

     }, 
     } 
local objectSheet = graphics.newImageSheet("gameObjects.png", sheetOptions) 
Balloons = {} 

-- ----------------------------------------------------------------------------------- 
-- Code outside of the scene event functions below will only be executed ONCE unless 
-- the scene is removed entirely (not recycled) via "composer.removeScene()" 
-- ----------------------------------------------------------------------------------- 

local function gotoGame() 
    composer.gotoScene("game") 
end 




-- ----------------------------------------------------------------------------------- 
-- Scene event functions 
-- ----------------------------------------------------------------------------------- 

-- create() 
function scene:create(event) 

    local sceneGroup = self.view 
    -- Code here runs when the scene is first created but has not yet appeared on screen 

    local background = display.newImageRect(sceneGroup, "background.png", 800, 1400) 
    background.x = display.contentCenterX 
    background.y = display.contentCenterY 





     local balloonBlue1 = display.newImageRect(sceneGroup, objectSheet, 6, 71, 100) 
     local balloonYellow1 = display.newImageRect(sceneGroup, objectSheet, 8, 71, 100) 
     local balloonRed1 = display.newImageRect(sceneGroup, objectSheet, 10, 71, 100) 
     local balloonBlue2 = display.newImageRect(sceneGroup, objectSheet, 6, 71, 100) 

     local Balloons = display.newGroup() 

    Balloons:insert(balloonBlue1) 
    Balloons:insert(balloonYellow1) 
    Balloons:insert(balloonRed1) 
    Balloons:insert(balloonBlue2) 


    Balloons:addEventListener("tap", gotoGame) 

    balloonBlue1.x = (display.contentWidth/8) 
    balloonBlue1.y = balloonBlue1.height 

     balloonYellow1.x = (display.contentWidth/8)*3 
    balloonYellow1.y = balloonBlue1.height 

     balloonRed1.x = (display.contentWidth/8)*5 
    balloonRed1.y = balloonBlue1.height 

    balloonBlue2.x = (display.contentWidth/8)*7 
    balloonBlue2.y = balloonBlue1.height 

end 


-- show() 
function scene:show(event) 

    local sceneGroup = self.view 
    local phase = event.phase 

    if (phase == "will") then 
     -- Code here runs when the scene is still off screen (but is about to come on screen) 

    elseif (phase == "did") then 
     -- Code here runs when the scene is entirely on screen 

    end 
end 


-- hide() 
function scene:hide(event) 

    local sceneGroup = self.view 
    local phase = event.phase 

    if (phase == "will") then 

    elseif (phase == "did") then 
     -- Code here runs immediately after the scene goes entirely off screen 

    end 
end 


-- destroy() 
function scene:destroy(event) 

    local sceneGroup = self.view 

    -- Code here runs prior to the removal of scene's view 

end 


-- ----------------------------------------------------------------------------------- 
-- Scene event function listeners 
-- ----------------------------------------------------------------------------------- 
scene:addEventListener("create", scene) 
scene:addEventListener("show", scene) 
scene:addEventListener("hide", scene) 
scene:addEventListener("destroy", scene) 
-- ----------------------------------------------------------------------------------- 

return scene 

Answer 1

您需要的Balloon组（其中的气球是儿童）添加到您的sceneGroup。

在scene:destroy，请确保您删除任何侦听器并取消任何想要销毁的东西的转换。如果你有，当场景的视图被破坏时，Balloon组及其所有的孩子也将被销毁。