[英]Error: Attempt to index global 'fifteenButton' (a nil value)
Error Line: 92
Attempt to index global 'fifteenButton' (a nil value)
stack traceback:
[C]: ?
/Users/ejaytumacder/dev/HappyShaker/time_select.lua:92: in function </Users/ejaytumacder/dev/HappyShaker/time_select.lua:90>
?: in function 'dispatchEvent'
?: in function '?'
?: in function 'gotoScene'
/Users/ejaytumacder/dev/HappyShaker/time_select.lua:12: in function '_onRelease'
?: in function '?'
?: in function <?:406>
?: in function <?:218>
这是我上面得到的错误,下面是它源自的代码。
local storyboard = require("storyboard")
local widget = require("widget")
local scene = storyboard.newScene()
local mydata = require("mydata")
local function fifteenSecondButtonEvent( event )
local phase = event.phase
if "ended" == phase then
mydata.time = 15
storyboard.gotoScene("play")
end
end
local function thirtySecondButtonEvent( event )
local phase = event.phase
if "ended" == phase then
mydata.time = 30
storyboard.gotoScene("play")
end
end
local function sixtySecondButtonEvent( event )
local phase = event.phase
if "ended" == phase then
mydata.time = 60
storyboard.gotoScene("play")
end
end
function scene:createScene( event )
local group = self.view
local timeText = display.newText("TIME", 160, 70, "Helvetica", 30)
group:insert( timeText )
local fifteenButton = widget.newButton {
time = 15,
left = 75,
top = 150,
width = 164,
height = 42,
defaultFile = "fifteen_button.png",
overFile = "fifteen_button_pressed.png",
label = "",
onRelease = fifteenSecondButtonEvent
}
--group:insert(fifteenButton)
local thirtyButton = widget.newButton {
time = 30,
left = 75,
top = 250,
width = 164,
height = 42,
defaultFile = "thirty_button.png",
overFile = "thirty_button_pressed.png",
label = "",
onRelease = thirtySecondButtonEvent
}
--group:insert(thirtyButton)
local sixtyButton = widget.newButton {
time = 60,
left = 75,
top = 350,
width = 164,
height = 42,
defaultFile = "sixty_button.png",
overFile = "sixty_button_pressed.png",
label = "",
onRelease = sixtySecondButtonEvent
}
group:insert(fifteenButton)
group:insert(thirtyButton)
group:insert(sixtyButton)
print( "Number of children in Display Group: " .. group.numChildren )
end
function scene:willEnterScene( event )
local group = self.view
end
function scene:enterScene( event )
local group = self.view
end
function scene:exitScene( event )
local group = self.view
fifteenButton:removeEventListener( 'onRelease', fifteenSecondButtonEvent ) -- line 92
thirtyButton:removeEventListener( 'onRelease', thirtySecondButtonEvent )
sixtyButton:removeEventListener( 'onRelease', sixtySecondButtonEvent )
timeText:removeSelf()
timeText = nil
if fifteenButton then
fifteenButton:removeSelf()
fifteenButton = nil
end
if thirtyButton then
thirtyButton:removeSelf()
thirtyButton = nil
end
if sixtyButton then
sixtyButton:removeSelf()
sixtyButton = nil
end
display.remove(group)
storyboard.removeScene( "time_select" )
end
function scene:destroyScene( event )
local group = self.view
end
scene:addEventListener("createScene", scene)
scene:addEventListener("willEnterScene", scene)
scene:addEventListener("enterScene", scene)
scene:addEventListener("exitScene", scene)
scene:addEventListener("destroyScene", scene)
return scene
所以你的问题有两个问题。 我将解决你为什么会收到这个错误。
你得到的是错误在线92因为你定义fifteenButton
在createScene功能。 作为本地对象。 所以它不能在createScene函数之外引用。 要解决该问题,您应该将local fifteenButton, thirtyButton, sixtyButton
到文件的顶部。 然后从createScene
相同的命名变量之前删除local
。 这将解决您的错误。
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