Question

我在Corona SDK中的第一步和第一次麻烦。尝试按照this OOP教程创建两个可以移动的框，但这不起作用。我已成功创建了两个盒子，但只有一个是可移动的。当我试图移动另一个时，它没有移动，但第一个移动。猜猜范围有问题，但无法确定究竟在哪里。谢谢你的帮助。

tile.lua源代码：

module (..., package.seeall)


function new(initX, initY)

    local scrnWidth = display.stageWidth
local scrnHeight  = display.stageHeight
local squareSize = (scrnWidth*0.9)/4

   local tile = display.newRect( initY, initY, squareSize, squareSize )

   function move(direction)
       if direction == "left" then
            transition.moveTo(tile, {x = tile.x+squareSize,y = tile.y,time = 200})
    elseif direction == "right" then
            transition.moveTo(tile, {x = tile.x-squareSize,y = tile.y,time = 200})
    elseif direction == "up" then
            transition.moveTo(tile, {x = tile.x,y = tile.y-squareSize,time = 200})
    elseif direction == "down" then
            transition.moveTo(tile, {x = tile.x,y = tile.y+squareSize,time = 200})
    end
   end


function tile:touch(event)
        if event.phase == "began" then
            display.getCurrentStage():setFocus( tile )
                beginX = event.x
                beginY = event.y
        end

        if event.phase == "ended"  then
                endX = event.x
                endY = event.y
            display.getCurrentStage():setFocus(nil)

                checkSwipeDirection();
        end
    end

function checkSwipeDirection()

        xDistance =  math.abs(endX - beginX) -- math.abs will return the absolute, or non-negative value, of a given value. 
        yDistance =  math.abs(endY - beginY)

        if xDistance > yDistance then
                if beginX > endX then
                        move("right",tile)
                else 
                       move("left",tile)

                end
        else 
                if beginY > endY then
                        move("up",tile)
                else 
                        move("down",tile)
                end
        end

end

tile:addEventListener("touch", tile)
   return tile

end

我使用main.lua中的以下代码创建对象：

    local tileConst = require("tile")
    local tile1 = tileConst.new(100,100)
    local tile2 = tileConst.new(200,200)

Answer 1

在tile.lua场景中，声明一个变量，以便在module (..., package.seeall)下方保留触摸的精灵：

local touchedSprite -- my temporary sprite variable

然后将目标精灵分配给函数内的上述变量：

function tile:touch(event)
    touchedSprite = event.target -- Assigning target to variable
    ...
end

现在更改函数move，如下所示：

function move(direction)
  if direction == "left" then
    transition.to(touchedSprite, {x = touchedSprite.x+squareSize,y = touchedSprite.y,time = 200})
  elseif direction == "right" then
    transition.to(touchedSprite, {x = touchedSprite.x-squareSize,y = touchedSprite.y,time = 200})
  elseif direction == "up" then
    transition.to(touchedSprite, {x = touchedSprite.x,y = touchedSprite.y-squareSize,time = 200})
  elseif direction == "down" then
    transition.to(touchedSprite, {x = touchedSprite.x,y = touchedSprite.y+squareSize,time = 200})
  end
end

请注意，我已将transition.moveTo更改为transition.to，将transition tile更改为touchedSprite(target).

保持编码..................：）

Lua中的OOP和eventListener（Corona SDK）

1 个答案: