我正在尝试制作一个能够从一个月到一个月切换的日历。我的问题是在触摸下一个或上一个按钮时删除每天的按钮。
这是我的上一个按钮从当前月份切换到上个月的代码。我的 Next 按钮代码几乎完全相同。当我第一次点击按钮时它工作得非常好，但是当我再次点击它时，我在 child:removeSelf() 行出现错误，并且打印消息告诉我表格中有 61 个元素。每次我去一个尚未见过的月份时，它似乎都会在表格中添加额外的按钮。
这对我来说真的很令人沮丧，因为我看不出代码每个月都制作额外按钮的任何原因，即使这样做，当点击按钮时，每个按钮仍然应该被删除。有人可以帮帮我吗？
local prev_function = function(event)
if event.phase == "release" then
today.year = 2012
today.month = 3
today.day = 29
today.wday = 5
if monthNum == 1 then
monthNum = 12
yearNum = yearNum - 1
elseif monthNum ~= 1 then
monthNum = monthNum - 1
end
local month = ""
if monthNum == 1 then month = "January"
elseif monthNum == 2 then month = "February"
elseif monthNum == 3 then month = "March"
elseif monthNum == 4 then month = "April"
elseif monthNum == 5 then month = "May"
elseif monthNum == 6 then month = "June"
elseif monthNum == 7 then month = "July"
elseif monthNum == 8 then month = "August"
elseif monthNum == 9 then month = "September"
elseif monthNum == 10 then month = "October"
elseif monthNum == 11 then month = "November"
elseif monthNum == 12 then month = "December"
end
monthText.text = month .. " " .. yearNum
print("Table elements before button deletion: " .. #buttonTable)
for i = #buttonTable, 1, -1 do
--[[if button[i] ~= nil then
table.remove(buttonTable)
button[i]:removeSelf()
button[i] = nil
end--]]
local child = table.remove(buttonTable)
if child ~= nil then
child:removeSelf()
child = nil
end
end
print("Table elements after button deletion: " .. #buttonTable)
next_button.alpha = 1
for i = 1, math.floor(numYears * 365.25) do
dateTable[i] = calendar.getInfo(today) --calculate the next day's date
if dateTable[i].year == yearNum and dateTable[i].month == monthNum then -- create a button if the date's year and month match the desired month
button[i] = ui.newButton{
default = "images/day.png",
over = "images/dayover.png",
text = dateTable[i].day,
size = 30,
font = native.systemFontBold,
textColor = {0, 0, 0, 255},
onEvent = addExpense_function,
offset = -35 }
if dateTable[i].wday == 1 then button[i].x = math.floor(col/2)
elseif dateTable[i].wday == 2 then button[i].x = (col * 1) + math.floor(col/2)
elseif dateTable[i].wday == 3 then button[i].x = (col * 2) + math.floor(col/2)
elseif dateTable[i].wday == 4 then button[i].x = (col * 3) + math.floor(col/2)
elseif dateTable[i].wday == 5 then button[i].x = (col * 4) + math.floor(col/2)
elseif dateTable[i].wday == 6 then button[i].x = (col * 5) + math.floor(col/2)
elseif dateTable[i].wday == 7 then button[i].x = (col * 6) + math.floor(col/2)
end
if dateTable[i].day == 1 then button[i].y = wDayBar.y + wDayBar.height/2 + math.floor(row/2)
elseif dateTable[i].wday == 1 then button[i].y = button[i-1].y + row
else button[i].y = button[i-1].y
end
end
today = dateTable[i]
table.insert(buttonTable, button[i])
--button[i].id = "button_" .. i
end
print("Table elements after button creation: " .. #buttonTable)
end
return true
end