RemoveEventListener：用於屬性查找供給零鍵

我創建了一個基團，並且增加了以下事件偵聽器調用一個函數：RemoveEventListener：用於屬性查找供給零鍵

catinBalloon:addEventListener("touch", catinBalloontouch)

隨後，我插入兩個對象成團catinBalloon和添加的組的表：

table.insert(catandBalloonTable, #catandBalloonTable+1, catinBalloon)

作爲另一個函數的一部分，我想通過表循環刪除偵聽器事件。

for i = #catandBalloonTable, 1, -1 do 
print_r(catandBalloonTable[i]) 
    catandBalloonTable[i]:removeEventListener("touch", catinBalloontouch) 

end

錯誤之前的print_r的輸出是：

04:20:03.364 table: 0DACC088 { 
04:20:03.364 [_proxy] => userdata: 0DAD20E0 
04:20:03.364 [_functionListeners] => table: 0DACC088 { 
04:20:03.364        [touch] => table: 0DADA0C0 { 
04:20:03.364           [1] => function: 04080198 
04:20:03.364           [2] => function: 0DA0E6E0 
04:20:03.364           } 
04:20:03.364       } 
04:20:03.364 [activeObjectWord] => "ant" 
04:20:03.364 [_class] => table: 0DACC088 { 
04:20:03.364     [removeEventListener] => function: 04245CE8 
04:20:03.364     [addEventListener] => function: 04247968 
04:20:03.364     [__index] => table: 0425AE40 { 
04:20:03.364         *table: 0425AE40 
04:20:03.364        } 
04:20:03.364    } 
04:20:03.364 [removeSelf] => function: 0433B9B8 
04:20:03.364 [active] => "yes" 
04:20:03.364 [activeObjectSound] => userdata: 0A0CAAE0 
04:20:03.364 }

和錯誤是：

04:20:03.364 ERROR: nil key supplied for property lookup. 
04:20:03.364 stack traceback: 
04:20:03.364 [C]: ? 
04:20:03.364 ?: in function 'removeEventListener' 
04:20:03.364 ?: in function 'removeEventListener' 
04:20:03.364 ?: in function 'removeEventListener'

謝謝。

來源

2017-05-04 Atrag

當您提供的處理函數（catinBalloontouch）在此作用域中不存在時，會出現此錯誤。解決您的問題的一種方法是使用前向參考。

-- top of your file 
local catinBalloontouch 
... 
function catinBalloontouch(event) -- now you don't need use key word local 
    ... 
end 
... 
for i = #catandBalloonTable, 1, -1 do 
print_r(catandBalloonTable[i]) 
    catandBalloonTable[i]:removeEventListener("touch", catinBalloontouch) 

end

來源

2017-05-04 06:35:55 ldurniat

RemoveEventListener：用於屬性查找供給零鍵

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