如何每10秒产生多个对象

Question

如何让这个每隔10秒生成一次'math.random(1,3)‘smile.png，并删除左屏之后的smile.png

<code>
local physics = require ("physics");
physics.start();

local function listener(me)
 transition.to (me, {time = math.random(1000,4000), x = math.random(10,310), y = -30, onComplete = function()listener(me)end});
end

--Spawning multiple objects in randoms locations
local function spawnsmile()

        local smile = display.newImageRect("smile.png", 45, 45);
        smile:setReferencePoint(display.CenterReferencePoint);
        smile.x = math.random(-10, 400);
        smile.y = -40;
        transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600,});
        physics.addBody(smile, "dynamic", {density = 0.1, bounce = 0.1, friction = .1, radius = 0});

                --Adding touch event
                smile:addEventListener("touch", smile);
end
 tmr = timer.performWithDelay(0, spawnsmile, total_smiles);
<code>

向凯文致敬

Answer 1

您的代码缺少total_smiles value assignment和delay参数。

工作代码：

local physics = require ("physics");
physics.start();

local function listener(me)
    transition.to (me, {time = math.random(1000,4000), x = math.random(10,310), y = -30, onComplete = function()listener(me)end});
end

--Spawning multiple objects in randoms locations
local function spawnsmile()
    local smile = display.newImageRect("Button.png", 45, 45);
    smile:setReferencePoint(display.CenterReferencePoint);
    smile.x = math.random(-10, 400);
    smile.y = -40;
    transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600,});
    physics.addBody(smile, "dynamic", {density = 0.1, bounce = 0.1, friction = .1, radius = 0});

    --Adding touch event
    smile:addEventListener("touch", smile);
end

local total_smiles = 15
tmr = timer.performWithDelay(10000, spawnsmile, total_smiles);

此外，您应该存储对创建的微笑的引用，以便正确地销毁它们，并且不会泄漏内存。more info on memory managment

local smiles = {}
table.insert(smiles, smile)

和处理：

for i=#smiles,1,-1 do
   smiles[i]:removeSelf()
   smiles[i] = nil
end

Answer 2

将计时器改为每10.000毫秒执行一次，而不是0。并且您的侦听器函数并没有真正满足任何目的，请删除它，并将spawnsmile函数中的transition.to更改为

    transition.to( smile, {time = math.random(2000, 8000), x = math.random(-10, 400) , y = 600, onComplete = function(obj) obj:removeSelf() obj = nil end});

这应该做你想让它做的事情=)也需要在total_smiles中有一个值，但我猜你在其他地方也有它。