CORONA:timer.cancel()返回“尝试索引空值". [英] CORONA: timer.cancel() returns "Attempt to index a nil value"

问题描述

我正试图取消在另一个触摸事件"功能内的触摸事件"功能中启动的计时器，如下所示:

I'm trying to cancel a timer started in a "touch event" function inside another "touch event" function, as shown below:

local function startNewGame(event)
if(event.phase=="ended")then
    local function animationImmaginiOggetti()
      for i=1, 7 do
        transition.to(immaginiOggettiAvvioPartita[i],
                      { time = 200, delay = 0, xScale = 0, yScale = 0, alpha = 0})
      end
    end
    local function removeImmaginiOggetti()
        if immaginiOggettiAvvioPartita[1] then
            for i=1, 11 do
                immaginiOggettiAvvioPartita[i]:removeSelf()
                immaginiOggettiAvvioPartita[i] = nil
            end
        end
    end

    local tmrAIO = timer.performWithDelay(4000, animationImmaginiOggetti, 1)
    local tmrRIO = timer.performWithDelay(4250, removeImmaginiOggetti, 1)
end
end


local function replayGame(event)
    if(event.phase=="ended")then
        timer.cancel(tmrAIO)
        timer.cancel(tmrRIO)
    end
end

startBTN:addEventListener("touch", startNewGame)
replayBTN:addEventListener("touch", replayGame)

我的问题是电晕回来了

文件:?Attempt to index a nil value" on timer.cancel (tmrAIO).

我在做什么错了?

推荐答案

问题如下，变量tmrAIO和tmrRIO对于函数startNewGame是局部的，这意味着只能从函数中访问它们. startNewGame定义的作用域，现在您正尝试从该函数外部访问这两者，并且它们未在该作用域中定义，这就是nil值的原因.

The problem is the following, the variables tmrAIO and tmrRIO are local to the function startNewGame, that means they can only be accessed from the scope defined by startNewGame and right now you are trying to access both from outside that function and they are not defined in that scope that's why the nil value.

解决方案:

local tmrAIO
local tmrRIO

local function startNewGame(event)
    if(event.phase=="ended")then
        local function animationImmaginiOggetti()
          for i=1, 7 do
            transition.to(immaginiOggettiAvvioPartita[i],
                          {time = 200, delay = 0, xScale = 0, yScale = 0, alpha = 0})
          end
        end
        local function removeImmaginiOggetti()
            if immaginiOggettiAvvioPartita[1] then
                for i=1, 11 do
                    immaginiOggettiAvvioPartita[i]:removeSelf()
                    immaginiOggettiAvvioPartita[i] = nil
                end
            end
        end

        tmrAIO = timer.performWithDelay(4000, animationImmaginiOggetti, 1)
        tmrRIO = timer.performWithDelay(4250, removeImmaginiOggetti, 1)
    end
end

local function replayGame(event)
    if(event.phase=="ended")then
        timer.cancel(tmrAIO)
        timer.cancel(tmrRIO)
    end
end

startBTN:addEventListener("touch", startNewGame)
replayBTN:addEventListener("touch", replayGame)

如您所见，我在startNewGame范围之外声明了tmrAIO和tmrRIO，使它们在文件内的任何位置都可以访问.

As you can see I declared tmrAIO and tmrRIO outside of the scope of startNewGame making them accessible anywhere inside this file.

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