Question

在调用onComplete之前，我需要检查“regalo”是否为nil，因为有时会被碰撞事件删除，当我调用onComplete = removeRegalo时，它会返回错误nil值。

错误：尝试调用方法'removeSelf'（零值）

有什么想法吗？

    local function removeRegalo(event)
        event:removeSelf()
        event = nil
    end
    local function tiraregalo()
        regalo = display.newImageRect("images/regalo.png", 30, 30)
        regalo.x = ship.x
        regalo.y = ship.y
        regalo:toFront()
        regalo.name = "regalo"
        physics.addBody( regalo, {isSensor = true } )
        grupoCasas:insert(regalo)
        local wind = 10 
        transition.to(regalo,{time=1500, y = screenH + 30, x = regalo.x + wind,rotation= math.random(-20,60), onComplete=removeRegalo})
    end
function onCollision( event )
    if(event.object1.name == "casa" and event.object2.name == "regalo") then
        display.remove( event.object2 )
    end
end

Answer 1

local function removeRegalo(event)
        if event == nil then return end
        event:removeSelf()
        -- event = nil Not really needed, but okay if you want it here.
    end

Answer 2

这样的事情会起作用吗？

if regalo ~= nil then
  -- object exists so do some code
end

希望有所帮助：）

Answer 3

也许这可以胜任。

local function removeRegalo(event)
    -- Check if event:removeSelf exists
    if event:removeSelf then
        event:removeSelf()
        event = nil
    end
end

Answer 4

以下是解决方案：

       local function removeRegalo(event)

            display.remove( event )
            event = nil
        end

event = nil - 这是可选的，因为@ 111WARLOCK111说。谢谢！

Answer 5

   local function removeRegalo(event)
         local tempObject=event.target
         if tempObject  then         
              tempObject:removeSelf()
              tempObject = nil
        end
   end

Corona：在调用onComplete事件之前检查nil值

5 个答案: