[英]Corona SDK saying attempt to call method 'removeSelf()' (a nil value)
[英]attempt to call method 'insert' (a nil value) when reloading a scene
嘗試重新加載場景時遇到了一些麻煩。
在我的程序中,用戶可以用手指畫一條線(這是一個iOS / Android應用程序),效果很好,但是當我嘗試重新加載場景時,控制台會返回
“嘗試索引字段“父級”(nil值)”
在第78行
我用來執行“畫線”和重新加載(在此情況下為重播)功能的代碼是
local lines = {}
local lineGroup = display.newGroup()
local prevX,prevY
local isDrawing = true
local i = 1
local function distanceBetween(x1, y1, x2, y2)
local dist_x = x2 - x1
local dist_y = y2 - y1
local distanceBetween = math.sqrt((dist_x*dist_x) + (dist_y*dist_y))
return distanceBetween
end
local function drawLine(e)
if(e.phase == "began") then
for i = #lines, 1, -1 do
if (lines[i]) then
if (lines[i].parent) then
lines[i].parent:remove(lines[i])
end
lines[i] = nil
end
end
lines = {}
line_number = 100
prevX = e.x
prevY = e.y
isDrawing = true
elseif(e.phase == "moved") then
local distance = distanceBetween(prevX, prevY, e.x, e.y)
if(isDrawing and distance < 100) then
if(lines[i]) then lineGroup:remove(i) end
lines[i] = display.newLine(prevX, prevY, e.x, e.y)
lines[i]:setColor(255, 255, 0)
lines[i].width = 3
lines[i].myName = "lines"
if(lines[i].y < 400) then
for i = #lines, 1, -1 do
if (lines[i]) then
if (lines[i].parent) then
lines[i].parent:remove(lines[i])
end
lines[i] = nil
end
end
end
local dist_x = e.x - prevX
local dist_y = e.y - prevY
physics.addBody(lines[i], "static",
{ density = 1, friction = 0.5, bounce =
-0.8, shape = {0, 0, dist_x, dist_y, 0, 0} } )
lineGroup:insert(lines[i])
end
elseif(e.phase == "ended") then
isDrawing = true
end
return lineGroup
end
Runtime:addEventListener("touch",drawLine)
第78行是:
lineGroup:insert(lines[i])
我使用重新啟動游戲
local replayBTN = display.newImageRect("images/replay.png", 25, 25)
replayBTN.alpha = 1
replayBTN.x = _W/2
replayBTN.y = _H/2
localGroup:insert( replayBTN)
function replay(event)
director:changeScene("game")
return true
end
replayBTN:addEventListener("touch", replay)
我該如何解決我的問題? 謝謝 ;)
您嘗試轉到另一個場景的那一刻不要重置所有值,因為您將其設置為nil,所以當您再次返回到場景時,會出現錯誤,並且我看到您正在使用Director類更改場景並轉到相同的位置您是否嘗試過使用情節提要的場景我不知道這對您來說是否會很方便,因為我認為您嘗試重置line
情節提要的值可以在刪除場景並繼續時重新創建並重置所有值到另一個場景。 您可以訪問此鏈接以比較導演班和故事板。 http://www.coronalabs.com/blog/2012/04/17/director-to-storyboard-transition-guide/
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.