Question

我试图在我的曲棍球应用中给用户一个重置按钮，但我一直收到此错误，我不知道还有什么可以尝试修复它attempt to call method 'removeSelf' (a nil value)。我试着搬东西，但这也没有帮助。我该如何解决这个错误？请帮帮我。

我的代码：

function startGame(event)
titleScreenGroup:removeSelf()

resetScore() -- in the case that this is a rematch
placePlayerOnePaddle()
placePlayerTwoPaddle()
placePuck(puckAvalLocation.center)  
Runtime:addEventListener( "postCollision", onPostCollision )
Runtime:addEventListener( "collision", onCollision )

appodeal.show("interstitial")    --<-------- move this to scene:show()'s "did" phase

end

local function gameRestart(event)
if ("ended" == event.phase) then
    --code here when touch begin
    startGame()
end
end

function setUpGroundGraphics()

local graphic = display.newImageRect( "bg.png", 768, 1024 )
graphic.x = display.contentWidth / 2
graphic.y = display.contentHeight / 2

local graphic = display.newImageRect( "score.png", 122, 144 )
graphic.x = topLeft.x + 90
graphic.y = display.contentHeight / 2

graphic = display.newImageRect( "centerLine.png", 768, 9 )
graphic.x = display.contentWidth / 2
graphic.y = display.contentHeight / 2

graphic = display.newImageRect( "centerCircle.png", 198, 198 )
graphic.x = display.contentWidth / 2
graphic.y = display.contentHeight / 2

-- top goal line
graphic = display.newImageRect( "goalLine.png", 497, 203 )
graphic.x = display.contentWidth / 2
graphic.y = topLeft.y + wallThickness * 2 + 70

-- bottom goal line
graphic = display.newImageRect( "goalLine.png", 497, 203 )
graphic.x = display.contentWidth / 5
graphic.y = bottomRight.y - wallThickness * 2 -70
graphic.rotation = 180

resetButton = display.newImageRect( "reset.png", 508, 224 )
resetButton.x = display.contentWidth / 4.1
resetButton.y = display.contentHeight - display.contentHeight / 2.5
resetButton:scale( 0.4, 0.4 )
resetButton:addEventListener("touch", gameRestart)

end

EDIT !!这是我定义titlescreengroup

的地方

local lastForce -- Used to calculate the volume of a the collision sound effects
local titleScreenGroup

function main()
display.setStatusBar( display.HiddenStatusBar )

setUpTable()

setUpTitleScreen()  
end

function setUpTable()
setUpGroundGraphics()
setUpPaddleWalls()
setUpPuckWalls()
setUpScoreText();

end

function setUpTitleScreen()

titleScreenGroup = display.newGroup()

local background = 
display.newImageRect("rink.jpg",display.contentWidth,display.contentHeight)
background.x = display.contentCenterX
background.y = display.contentCenterY
titleScreenGroup:insert(background)

title = display.newImageRect( "title.png", 530, 196 )
title.x = display.contentWidth / 2
title.y = display.contentHeight / 4
titleScreenGroup:insert(title)

playButton = display.newImageRect( "play.png", 508, 224 )
playButton.x = display.contentWidth / 2
playButton.y = display.contentHeight - display.contentHeight / 4
titleScreenGroup:insert(playButton)

display.getCurrentStage():insert(titleScreenGroup)

playButton:addEventListener("touch", startGame)

end

Answer 1

我认为您尝试多次删除titleScreenGroup群组。这应该有所帮助：

function startGame(event)
    if titleScreenGroup then
        titleScreenGroup:removeSelf()
        titleScreenGroup = nil
    end
    resetScore() -- in the case that this is a rematch
    placePlayerOnePaddle() 
    placePlayerTwoPaddle()
    placePuck(puckAvalLocation.center)  
    Runtime:addEventListener( "postCollision", onPostCollision )
    Runtime:addEventListener( "collision", onCollision )

    appodeal.show("interstitial")    --<-------- move this to scene:show()'s "did" phase
end

我还注意到，当用户触摸播放按钮时，startGame函数被调用两次。快速修复：

function setUpTitleScreen()
    ...
    playButton:addEventListener("touch", gameRestart)
end

Answer 2

更好地使用 display.remove（object）然后 titleScreenGroup = nil https://docs.coronalabs.com/api/library/display/remove.html

2018-03-12 15:43:42,330 INFO o.a.j.t.JMeterThread: Stopping Thread: org.apache.jorphan.util.JMeterStopThreadException: The thread is scheduled to stop in -99886 ms and the throughput timer generates a delay of 20004077. JMeter (as of 4.0) does not support interrupting of sleeping threads, thus terminating the thread manually.

Corona sdk尝试调用方法＆＃39; removeSelf＆＃39; （零值）

2 个答案: