电晕错误:尝试调用全局"startButtonListeners" < nil值>

问题描述

我正在用电晕制作一个主菜单，但是遇到一个错误，它使我发疯.

I'm making a main menu scene in corona, however I've come across an error and its driving me crazy.

编译器使我难以理解它是什么，但我可以指出其中的两个问题:

The compiler makes it confusing for me to understand what it is but I can point out 2 problems from it:

• 尝试调用全局"startButtonListeners"
• [C]在函数"startButtonListeners"中

这是代码部分:

 function scene:enterScene(event)
    local group = self.view
    startButtonListeners('add')

    function startButtonListeners(action)
      if(action == 'add') then
         aboutBtn:addEventListener('tap', showCredits)
         startBtn:addEventListener('tap', startBtn)
      end

      local function onSceneTouch( self, event )
        if event.phase == "began" then
        storyboard.gotoScene( "scene1", fade, 500 )
        return true
      end
    end
end

推荐答案

将函数startButtonListeners的位置更改为结尾；函数定义完成后:

Change the location of your function startButtonListeners to the end; after your function definition is complete:

scene:enterScene(event)
    local group = self.view

    function startButtonListeners(action)
      if(action == 'add') then
         aboutBtn:addEventListener('tap', showCredits)
         startBtn:addEventListener('tap', startBtn)
      end

      local function onSceneTouch( self, event )
        if event.phase == "began" then
        storyboard.gotoScene( "scene1", fade, 500 )
        return true
      end
    end
    startButtonListeners('add')
end

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