1

当我尝试重新加载场景时遇到了一些麻烦。

在我的程序中,用户可以用手指画一条线(这是一个 iOS/Android 应用程序),效果很好,但是,当我尝试重新加载场景时,控制台返回

“尝试索引字段'父'(零值)”

在第 78 行

我用来执行“drawline”和重新加载(在本例中为重播)功能的代码是

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)

其中第 78 行是:

lineGroup:insert(lines[i])

我重新开始我的游戏使用

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)

我该如何解决我的问题?谢谢 ;)

4

1 回答 1

0

当您尝试转到另一个场景时不要重置所有值,因为您将其设置为 nil 所以当您再次返回场景时会出现错误,我看到您使用导演类来更改场景并转到相同的场景场景你尝试使用情节提要我不知道它是否对你来说很方便,因为我认为你只是试图重置line情节提要的值可以在删除场景并转到时重新创建和重置所有值另一个场景。你可以访问这个链接来比较导演班和故事板。 http://www.coronalabs.com/blog/2012/04/17/director-to-storyboard-transition-guide/

于 2013-07-03T01:17:03.247 回答