Question

这里我正在创建一个按钮，其中包含按下按钮时调用的功能

local politeButton = widget.newButton
{

left = 35,
top = 335,
width = 70,
height = 70,
defaultFile = "images/politeRu.png",
overFile = "images/politeWhiteRu.png",
onPress = politeGenerator,
}

这是函数（实际上它是在按钮上面编码的）

math.randomseed(os.time())
local function politeGenerator()

local firstRandomPart = math.random(1,3)
local secondRandomPart = math.random(1,3)
local thirdRandomPart = math.random(1,3)

local firstComplPart = {"I love", "I need", "I beg"}
local secondComplPart = {" you like mad ", " the color of your eyes ", " your lips "}
local thirdComplPart = {"and I wish you are going to be mine!", "and I am shivering!", "and this is all I want!"}

local politeCompliment = firstComplPart[firstRandomPart]..secondComplPart[secondRandomPart]..thirdComplPart[thirdRandomPart]

local complimentItself = display.newText(politeCompliment, 30, 150, 200, 200, "Lobster", 18)

end

好的，现在我在模拟器中看到一些随机生成的文本。但是，当我再次按下按钮时，旧文本不会消失，旧文本上会出现新文本，依此类推。但是每次按下按钮我都需要覆盖文本。我试过了event.phase == "began"，我试过了complimentItself:removeSelf()，但一切都是徒劳的。有人可以帮忙吗？我只是不明白为什么当按下按钮时变量不会被覆盖。

Answer 1

您可以使用.text来更改原始文本，我会使用计时器对代码进行编码，以查看文本是否正在发生变化，代码的问题是在您调用{{1}时函数是你总是初始化一个局部变量politeGenerator()它不会覆盖现有的文本，而是创建一个与旧文本重叠的新文本

complimentItself

Answer 2

我正在使用此功能来创建和更新文本对象。这很简单：

function createText( text, xPos, yPos, fontSize, color, refPoint )
    local myText = display.newText( "", 0, 0, native.systemFont, fontSize )
    myText.text = text
    if refPoint == "CL" then
        myText:setReferencePoint( display.CenterLeftReferencePoint )
    elseif refPoint == "CR" then
        myText:setReferencePoint( display.CenterRightReferencePoint )
    elseif refPoint == "C" then
        myText:setReferencePoint( display.CenterReferencePoint )
    end
    myText.x = xPos
    myText.y = yPos

    if color then myText:setTextColor( color[1], color[2], color[3] ) 
    else myText:setTextColor(255, 255, 255) end

    function myText:update( t, refPoint )
        myText.text = t.text or myText.text
        myText.size = t.fontSize or myText.size

        if refPoint == "CL" then
            myText:setReferencePoint( display.CenterLeftReferencePoint )
        elseif refPoint == "CR" then
            myText:setReferencePoint( display.CenterRightReferencePoint )
        elseif refPoint == "C" then
            myText:setReferencePoint( display.CenterReferencePoint )
        end

        myText.x    = t.xPos or myText.x
        myText.y    = t.yPos or myText.y
    end

    return myText
end

示例：

local myText = createText( "Random text", 50, 160, 20, { 0, 0, 0 }, "C" )
myText:update( { text = "Updated random text", size = 30, xPos = 400, yPos = 300 }, "C" )

如何覆盖以前创建的newText对象

2 个答案: