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我是 Corona 的新手，正在尝试进行一些基本的 OOP。我有一个需要多个时间选择器小部件的应用程序，并且希望能够为每个实例重用一个“时间选择器”类。到目前为止，这是我的代码（简单的 - timepicker.lua）：

module(..., package.seeall)

local widget = require "widget"

picker = {}
picker.__index = picker

function picker.new()
    local picker_object = {}
    setmetatable(picker_object,picker)

    pickerGroup = display.newGroup()

    picker_object.theHour = 0
    picker_object.theMin = 0
    picker_object.am = true

    picker_object.increaseHrBtn = widget.newButton{
        default="gfx/up_regular.png",
        over="gfx/up_press.png",
        width=40, height=40,
        onRelease = picker.incHr
    }

    picker_object.decreaseHrBtn = widget.newButton{
        default="gfx/down_regular.png",
        over="gfx/down_press.png",
        width=40, height=40,
        onRelease = picker.decHr
    }

    picker_object.decreaseHrBtn.y = 100

    pickerGroup:insert(picker_object.increaseHrBtn.view)
    pickerGroup:insert(picker_object.decreaseHrBtn.view)

    return picker_object
end

function picker:incHr(event)
    print("inc")
end

function picker:decHr(event)
    print("dec")
end

这是我实例化它的地方：

local TimePicker = require("timepicker")
local reminderPicker1 = TimePicker.picker.new()

这给了我一个在屏幕上正常工作的时间选择器（或者其中的前两个按钮，无论如何）。但我想抓住这个选择器的显示对象并将它们放入屏幕上的滚动视图中。因为该类返回一个对象，所以不能将其插入到滚动视图中。我确定这是一件基本的事情，但我不知道接下来我需要做什么！任何人都可以帮忙吗？非常感激。

编辑

发布我的课程，这似乎几乎就在那里，除了在课堂内访问变量“theHour”和“theMin”时遇到问题......

module(..., package.seeall)

local widget = require "widget"

picker = {}
picker.__index = picker

function picker.new()
    local picker_object = {}
    setmetatable(picker_object,picker)

    picker_object.theHour = 12
    picker_object.theMin = 0
    picker_object.am = true

    picker_object.increaseHrBtn = widget.newButton{
        default="gfx/up_regular.png",
        over="gfx/up_press.png",
        width=40, height=40,
        onRelease = picker.incHr
    }

    picker_object.decreaseHrBtn = widget.newButton{
        default="gfx/down_regular.png",
        over="gfx/down_press.png",
        width=40, height=40,
        onRelease = picker.decHr
    }

    picker_object.decreaseHrBtn.y = 100

    picker_object.hrText = display.newText("12", 6, 41, native.systemFont, 24)
    picker_object.hrText:setTextColor(0, 0, 0)

    picker_object.dotsText = display.newText(":", 58, 39, native.systemFont, 24)
    picker_object.dotsText:setTextColor(0, 0, 0)

    picker_object.increaseMinBtn = widget.newButton{
        default="gfx/up_regular.png",
        over="gfx/up_press.png",
        width=40, height=40,
        onRelease = picker.incMin
    }

    picker_object.increaseMinBtn.x = 100

    picker_object.decreaseMinBtn = widget.newButton{
        default="gfx/down_regular.png",
        over="gfx/down_press.png",
        width=40, height=40,
        onRelease = picker.decMin
    }
    picker_object.decreaseMinBtn.y = 100
    picker_object.decreaseMinBtn.x = 100

    picker_object.minText = display.newText("00", 86, 41, native.systemFont, 24)
    picker_object.minText:setTextColor(0, 0, 0)

    picker_object.ampmBtn = widget.newButton{
        default="gfx/blank_normal.png",
        over="gfx/blank_press.png",
        label = "AM",
        font = "Korean Calligraphy",
        fontSize = 25,
        width=58, height=58,
        onRelease = picker.toggleAmPm
    }

    picker_object.ampmBtn.x = 160
    picker_object.ampmBtn.y = 58

    return picker_object
end

function picker:getHour()
    return self.theHour
end

function picker:getMin()
    return self.theMin
end

function picker:incHr(event)
    print("inc")
    if self.theHour < 12 then
        self.theHour = self.theHour + 1
    else 
        self.theHour = 1
    end

    if self.theHour < 10 then
        picker_object.hrText.text = "0"..self.theHour
    else
        picker_object.hrText.text = self.theHour
    end
end

function picker:decHr(event)
    print("dec")
    if self.theHour > 1 then
        self.theHour = self.theHour - 1
    else 
        self.theHour = 12
    end
    if self.theHour < 10 then
        picker_object.hrText.text = "0"..self.theHour
    else
        picker_object.hrText.text = self.theHour
    end
end

function picker:incMin(event)
    print("inc")
    if self.theMin < 59 then
        self.theMin = self.theMin + 1
    else 
        self.theMin = 0
    end

    if self.theMin < 10 then
        picker_object.minText.text = "0"..self.theMin
    else
        self.minText.text = self.theMin
    end
end

function picker:decMin(event)
    print("dec")
    if self.theMin > 0 then
        self.theMin = self.theMin - 1
    else 
        self.theMin = 59
    end
    if self.theMin < 10 then
        picker_object.minText.text = "0"..self.theMin
    else
        picker_object.minText.text = self.theMin
    end
end

function picker:toggleAmPm(event)
    if self.am == true then
        self.am = false
        picker_object.ampmBtn:setLabel( "PM" )
    else
        self.am = true
        picker_object.ampmBtn:setLabel( "AM" )
    end
end
4

1 回答 1

1

啊! 你在上一个问题中问对了。我忘了回答这个问题。

无论如何，您可以访问显示对象 reminderPicker1.increaseHrBtn，reminderPicker1.decreaseHrBtn等等。

在类方法中，您可以通过以下方式访问它们 self.increaseHrBtn，self.decreaseHrBtn

编辑

更改onRelease = picker.toggleAmPm为

onRelease = function() picker_object:toggleAmPm() end

并更改picker_object.ampmBtn:setLabel( "PM" )为

self.ampmBtn:setLabel( "PM" )

对所有其他实例执行相同操作。你会没事的！

于 2012-05-29T17:59:00.490 回答