試圖在日冕中調用方法'translet'（零值）

Question

對於這個函數fallingCoins() ，我在我的代碼中向后移動硬幣，當錨接觸硬幣時我需要隱藏這些硬幣。

function fallingCoins()
local myPlayer = display.newCircle( math.random(20,_W+20), -25, math.random(10,10)  )
    myPlayer:setStrokeColor(255, 128, 0 ) 
    myPlayer:setFillColor(math.random(245,255),math.random(210,223),7)
    myPlayer.myName = "myPlayer"
    physics.addBody( myPlayer, "static" )
    myPlayer.y = "150"
     local function muovi()
     myPlayer:translate(-2, 0)
     end
 Runtime:addEventListener( "enterFrame", muovi );

end
timer.performWithDelay( 3000, fallingCoins )

如果碰到錨，我就會隱藏硬幣。

function onCollision3( event )
   if(event.object1.myName == "guy" and event.object2.myName == "myPlayer") then
      event.object2:removeSelf(); 
   end
end
Runtime:addEventListener( "collision", onCollision3 )

如果我觸摸硬幣然后我就會收到此錯誤

"---------------------------
Corona Runtime Error
---------------------------
...as\desktop\run2\scroll\scrolling background\main.lua:123: attempt to call method 'translate' (a nil value)
stack traceback:
    [C]: in function 'translate'
    ...as\desktop\run2\scroll\scrolling background\main.lua:123: in function <...as\desktop\run2\scroll\scrolling background\main.lua:122>
    ?: in function <?:218>

Do you want to relaunch the project?
---------------------------
Yes   No   
---------------------------
"

請幫我，我在做錯了..

Answer 1

translate方法可以應用於顯示對象。 在這里你的對象也是一個物理，對象。 你可以改變有問題的行：

myPlayer.x = myPlayer.x - 2

PS：但在這種情況下，它會快速移動^^