lua - Corona Sdk：将函数创建的项目放入表中

Question

我不知道如何将由一个简单函数创建的对象放在一个表中，让它们作为单独的身份出现..

例如

local function spawncibo()
nuovoCibo = display.newImage("immagini/cibo/cibo001.png")
end
timer.performWithDelay(1500, spawncibo, -1)

我尝试使用 for 循环来执行此操作，但它不起作用（如果我尝试打印表格，我总是得到 nil 结果）。

任何建议将不胜感激！

Answer 1

你可以试试这个...

local spawned = {} -- local table to hold all the spawned images
local timerHandle = nil -- local handle for the timer. It can later be used to cancel it if you want to

local function spawnCibo()
    local nuovoCibo = display.newImage('immagini/cibo/cibo001.png')
    table.insert(spawned, nuovoCibo) -- insert the new DisplayObject (neovoCibo) at the end of the spawned table.
end

local function frameListener()
    for k, v in pairs(spawned) do -- iterate through all key, value pairs in the table
        if (conditions) then -- you will probably want to change conditions to some sort of method to determine if you want to delete the cibo
            display.remove(spawned[k]) -- remove the part of the object that gets rendered
            spawned[k] = nil -- remove the reference to the object in the table, freeing it up for garbage collection
        end
    end
end

timer.performWithDelay(1500, spawnCibo, 0) -- call spawnCibo() every 1.5 seconds, forever (That's what the 0 is for) or until timer.cancel is called on timerHandle
Runtime:addEventListener('enterFrame', frameListener) -- 

如果您还有其他问题，请随时提出。

Answer 2

local spawnedCibos = {}
local function spawncibo()
    nuovoCibo = display.newImage("immagini/cibo/cibo001.png")
    table.insert(spawnedCibos, nuovoCibo);
end
timer.performWithDelay(1500, spawncibo, -1);

local function enterFrameListener( event )
    for index=#spawnedCibos, 1, -1 do
        local cibo = spawnedCibos[index];
        cibo.x = cibo.x + 1;
        if cibo.x > display.contentWidth then
            cibo:removeSelf();
            table.remove(spawnedCibos, index);
        end
    end
end

Answer 3

如果我正确理解了你的问题，你可以尝试这样的事情：

local cibo = {}
local function spawncibo()
  cibo[#cibo+1] = display.newImage(string.format(
    "immagini/cibo/cibo%3d.png", #cibo+1))
end
timer.performWithDelay(1500, spawncibo, -1)

这将每 1.5 秒读取文件cibo001.png, cibo002.png, ... 并将所有图像放入cibo数组中。