Question

我是Corona SDK的新手，我只是看一下示例项目，看看事情是如何运作的。我正在看TAB示例，但是我遇到了问题。

我有一个这样的页面（这是第2页）

local composer = require( "composer" )
local scene = composer.newScene()

function scene:create( event )
    local sceneGroup = self.view

    -- Called when the scene's view does not exist.
    -- 
    -- INSERT code here to initialize the scene
    -- e.g. add display objects to 'sceneGroup', add touch listeners, etc.

    -- create a white background to fill screen (things go in here like pictures etc)
    local bg = display.newRect( 0, 0, display.contentWidth, display.contentHeight )
    bg.anchorX = 0
    bg.anchorY = 0
    bg:setFillColor( 0 )    -- white

    -- this will create the thing that you drag (the function is after)
    local tracker = display.newRect( 568, 340, 50, 50 )
    tracker:setFillColor( 1 )

    -- all objects must be added to group (e.g. self.view)
    sceneGroup:insert( bg )
    sceneGroup:insert( tracker )
end

function scene:show( event )
    local sceneGroup = self.view
    local phase = event.phase

    if phase == "will" then
        -- Called when the scene is still off screen and is about to move on screen
    elseif phase == "did" then
        -- Called when the scene is now on screen
        -- 
        -- INSERT code here to make the scene come alive
        -- e.g. start timers, begin animation, play audio, etc.
    end 
end

function scene:hide( event )
    local sceneGroup = self.view
    local phase = event.phase

    if event.phase == "will" then
        -- Called when the scene is on screen and is about to move off screen
        --
        -- INSERT code here to pause the scene
        -- e.g. stop timers, stop animation, unload sounds, etc.)
    elseif phase == "did" then
        -- Called when the scene is now off screen
    end
end

function scene:destroy( event )
    local sceneGroup = self.view

    -- Called prior to the removal of scene's "view" (sceneGroup)
    -- 
    -- INSERT code here to cleanup the scene
    -- e.g. remove display objects, remove touch listeners, save state, etc.
end

function tracker:touch( event )
    if event.phase == "began" then
        self.markX = self.x --stores x location
        self.markY = self.y --stores y location
    elseif event.phase == "moved" then
        local x = (event.x - event.xStart) + self.markX
        local y = (event.y - event.yStart) + self.markY
        self.x, self.y = x, y -- moves the object from things above
    end
end



---------------------------------------------------------------------------------

-- Listener setup
scene:addEventListener( "create", scene )
scene:addEventListener( "show", scene )
scene:addEventListener( "hide", scene )
scene:addEventListener( "destroy", scene )
tracker:addEventListneer( "touch", tracker)
-----------------------------------------------------------------------------------------

return scene

无论如何要简化我所做的改变：

local tracker = display.newRect( 568, 340, 50, 50 )
tracker:setFillColor( 1 )

这将创建一个我想要制作的新盒子，这样你就可以将它拖到屏幕上了（我已经使用过这个功能）：

function tracker:touch( event )
    if event.phase == "began" then
        self.markX = self.x --stores x location
        self.markY = self.y --stores y location
    elseif event.phase == "moved" then
        local x = (event.x - event.xStart) + self.markX
        local y = (event.y - event.yStart) + self.markY
        self.x, self.y = x, y -- moves the object from things above
    end
end

总的来说，它会创建一个框，我正在尝试添加一个函数，以便您可以将其拖动到屏幕上。但是它不起作用并且给我一个错误，说明tracker在函数行function tracker:touch( event )的那个开头是错误的？任何帮助，因为我认为这是在错误的地方。

P.S我也有一个tracker:addEventListneer( "touch", tracker)听众。

-Thanks

Answer 1

您正在local tracker函数中创建scene:create作为局部变量。这意味着此变量仅在所述函数的范围内可用。

您需要在tracker:touch(event)函数中移动scene:create函数才能使跟踪器可以访问。

您需要将监听器移动到scene:create函数的底部。

Answer 2

没关系。我修好了。我应该经常检查我的拼写xD（我拼错了tracker:addEventListener( "touch", tracker)错误）。这样的菜鸟错误。谢谢你的帮助。

无法在Corona SDK中使用函数（使用TabButton）

2 个答案: