好吧，我在从游戏中删除对象时遇到了一些麻烦，问题是我有一个玩家类（由元表组成），在里面我有一个名为 sprite 的变量，它保存我将在屏幕上绘制的图像精灵的地址，所以当我创建对象时，我不会立即绘制精灵，因为我做了一个函数绘制（这只是为了解释我所拥有的）。在game.lua中，我通过调用该函数来绘制玩家，然后我想删除我的玩家实例（这样屏幕上的图像也会消失）......就是这样，我尝试了player：removeSelf（），显示。 remove(player)，其中一个向我抛出了一个错误（尝试调用字段'removeSelf'（一个 nil 值）），另一个运行正常，但它并没有改变玩家仍然在那里的事实（我可以访问它的功能和精灵仍然显示在屏幕上.. . 好吧，这是我的代码：
**********************************************************
game.lua:
**********************************************************
---------------------------------------------------------------------------------
-- BEGINNING OF YOUR IMPLEMENTATION
---------------------------------------------------------------------------------
local _W, _H = display.contentWidth * 0.5, display.contentHeight * 0.5
local background, player, land
local spriteSizeX, spriteSizeY = 60,70
-- Called when the scene's view does not exist:
function scene:createScene( event )
local group = self.view
local BG = display.newGroup()
local stage = display.newGroup()
local foreground = display.newGroup()
group:insert(BG)
group:insert(stage)
group:insert(foreground)
-----------------------------------------------------------------------------
-- CREATE display objects and add them to 'group' here.
-- Example use-case: Restore 'group' from previously saved state.
-----------------------------------------------------------------------------
background = display.newImage("assets/backgrounds/oliveBackground.png", true)
background.x, background.y = _W, _H
BG:insert( background )
player = playerClass.new()
player:draw(15,57.5,foreground)
--player:movePlayer(300,140)
terrain = {}
local m,j = 0,0
for i = 1, 16 do
local l = 1
for k = 3, 10 do
land = landClass.new({posx = i, posy = k})
table.insert(terrain, land)
m = m +1
terrain[m]:draw( spriteSizeX/4 + ((spriteSizeX/2) * j), spriteSizeY/4 + ((spriteSizeY/2) * l) + 5, stage)
l = l + 1
end
j = j+1
end
-- remove an asset doesn't work
--display.remove(terrain[1]:getSprite())
--terrain[1].removeSelf()
-- terrain[1] = nil
player:destroy()
end
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player.lua:
**********************************************************
-- player class
local player = {}
local player_mt = { __index = player }
--[[
-- attributes
local sprite, coins, speed
]]--
function player.new() -- constructor
local newPlayer = {
sprite = "assets/char/miner.png",
coins = 1000,
speed = 1
}
return setmetatable( newPlayer, player_mt )
end
-- local function, works only when called from inside this class
local function getName()
-- print("")
end
function player:draw(x,y,group)
sprite = display.newImage(self.sprite)
sprite.x, sprite.y = x, y
sprite.xScale, sprite.yScale = 0.5, 0.5
group:insert(sprite)
end
function player:movePlayer(posx,posy)
transition.to(sprite, { x = posx, y = posy, time=500, delay=0, alpha=1.0 })
end
function player:destroy()
-- none of them work
-- self.sprite = nil
-- self.sprite.removeSelf()
end
return player