CORONA SDK：如何停止事件循環？

Question

在開發我的App時，由於我不了解如何停止事件循環而導致兩個問題。 我編寫了以下代碼來復制此問題。

在我的應用程序中，有一個復雜的模型需要花費兩分鍾的時間來計算解決方案。

我希望可以通過單擊兩個不同的按鈕來顯示計算過程中經過的時間，並停止或重新開始計算（為簡單起見，代碼中有兩個圓圈）。

從下面的代碼中如何看到，我可以查看經過的時間並僅在同一循環完成時才停止循環。

有人已經有這個問題了嗎？

對不起，英語。 感謝您的提示

問候，詹盧卡

local calculation_progress=true

local messagge_obj=display.newText("Start Calculation",display.contentCenterX-200, display.contentCenterY-200, native.systemFont, 40)
messagge_obj:setTextColor( 255, 255, 255 )

--- here there is a simple function, but in my App is a complex loop that works until 2 minutes
local function loop_fun()
    messagge_obj.text="Calculation started"
    local max_comps=1000000
    for i=1,max_comps do
        if calculation_progress==true then
            local messagge_loop=tostring(i) --- here is a simple model  
            print(messagge_loop)
        else
            break
        end
    end
    messagge_obj.text="Calculation done"
end

--- setting of the timer
local test_time_label = display.newText("Time:", display.contentCenterX-125, display.contentCenterY-50, native.systemFont, 40 )
local test_time = display.newText("", display.contentCenterX-20, display.contentCenterY-10, native.systemFont, 40 )
local function refresh_time()
    local currentTime = os.date("*t")
    test_time.text=os.time( t ) --currentTime
end
Runtime:addEventListener("enterFrame",  refresh_time)

--- setting of play and stop button
local function play_calc()
    calculation_progress=true
    loop_fun()
    print("calculation_progress",calculation_progress)
end
local function stop_calc()
    calculation_progress=false
    print("calculation_progress",calculation_progress)
end
local myButton_calc_play = display.newCircle(display.contentCenterX+60,display.contentCenterY+200,60)
local test_play = display.newText("Play", display.contentCenterX+10,display.contentCenterY+180, native.systemFont, 45 )
test_play:setTextColor(0)
test_play:addEventListener("tap",  play_calc)
local myButton_calc_stop = display.newCircle(display.contentCenterX-100,display.contentCenterY+200,60)
local test_stop = display.newText("Stop", display.contentCenterX-145,display.contentCenterY+180, native.systemFont, 45 )
test_stop:setTextColor(0)
test_stop:addEventListener("tap",  stop_calc)

--- loop inside model
loop_fun()

Answer 1

我不完全了解您的需求。 以下是您所需要的嗎？

local statusLabel
local calculation_progress = false
local timer_1

local messageLabel =display.newText("Start Calculation",90,90, native.systemFont, 20)
messageLabel:setTextColor( 255, 255, 255 )

local minVal = 02
local secVal = 00

local minLabel = display.newText("0"..minVal,130,120, native.systemFont, 20)
local secLabel = display.newText(":0"..secVal,160,120, native.systemFont, 20)

local function timerDown()
    secVal = secVal - 1
    if(secVal<0 and minVal<=0)then
        if(timer_1)then timer.cancel(timer_1) end
        statusLabel.text = "Play"
        print("Timer stopped... Calculation Finished...")
        return true;
    end
    if(secVal<=0 and minVal>0)then
        secVal = 59
        minVal = minVal - 1
    end
    secLabel.text = ":"..secVal
    minLabel.text = minVal
    if(secVal<10)then secLabel.text = ":0"..secVal end
    if(minVal<10)then minLabel.text = "0"..minVal end
    print(secVal)
end

local function myCalculationChanger()
    --[[I've assigned this to a single button,
        if you want, you can separate them --]]
    if(calculation_progress==false)then  -- First click to start
        calculation_progress = true
        statusLabel.text = "Stop"
        timer_1 = timer.performWithDelay(1000,timerDown,-1)
    else                                 -- Next click to restart
        if(timer_1)then timer.cancel(timer_1) end
        minVal = 02
        secVal = 00
        secLabel.text = ":"..secVal
        minLabel.text = minVal
        if(secVal<10)then secLabel.text = ":0"..secVal end
        if(minVal<10)then minLabel.text = "0"..minVal end

        statusLabel.text = "Play"
        calculation_progress = false
    end
end

local myButton = display.newCircle(0,0,60)
myButton.x = display.contentWidth/2
myButton.y = display.contentHeight-100
myButton:addEventListener("tap",myCalculationChanger)

statusLabel = display.newText("Play",20,20,nil,40)
statusLabel.x = myButton.x
statusLabel.y = myButton.y
statusLabel:setTextColor(0)

繼續編碼......... :)

Answer 2

非常感謝您的答復和您發布的代碼。 但是我的意圖是要很長一段時間（直到2-5分鍾）退出計算循環。 我已通過代碼下方COPROA SDK論壇中收到的建議解決了該問題。

問候，詹盧卡

local calculation_progress=true

local messagge_obj=display.newText("Start Calculation",display.contentCenterX-200, display.contentCenterY-200, native.systemFont, 40)
messagge_obj:setTextColor( 255, 255, 255 )

--- function to exit from loop
function verify_progress_loop()
    local outcome=true
    if calculation_progress==false then 
        outcome=false
    end
    return outcome
end

--- here there is a simple function, but in my App is a complex loop that works until 2 minutes
local max_comps=100000
local n_min_cicle=100
local n_delay=max_comps/n_min_cicle
local function loop_fun()

    local t

    local i=0
    local function doWork()

        for j=1,n_min_cicle do
            local outcome=verify_progress_loop()
            if outcome==true then
                local messagge_loop=tostring(i) --- here is a simple model  
                print(messagge_loop)
            else
                messagge_obj.text="Calculation stopped"
                timer.cancel(t)
                --return 0
            end

            i=i+1
            if i==max_comps then 
                messagge_obj.text="Calculation done" 
                timer.cancel(t)
            end
        end

    end

    t=timer.performWithDelay( 0.1, doWork, n_delay )

end

--- setting of the timer
local test_time_label = display.newText("Time:", display.contentCenterX-125, display.contentCenterY-50, native.systemFont, 40 )
local test_time = display.newText("", display.contentCenterX-20, display.contentCenterY-10, native.systemFont, 40 )
local function refresh_time()
    local currentTime = os.date("*t")
    test_time.text=os.time( t ) --currentTime
end
Runtime:addEventListener("enterFrame",  refresh_time)

--- setting of play and stop button
local function play_calc(event)
    messagge_obj.text="Calculation started"
    calculation_progress=true
    loop_fun()
    print("Inside play_cal function")

    return true
end
local function stop_calc(event)
    calculation_progress=false
    print("Inside stop_cal function")

    return true
end
local myButton_calc_play = display.newCircle(display.contentCenterX+60,display.contentCenterY+200,60)
local test_play = display.newText("Play", display.contentCenterX+10,display.contentCenterY+180, native.systemFont, 45 )
test_play:setTextColor(0)
test_play:addEventListener("tap",  play_calc)
local myButton_calc_stop = display.newCircle(display.contentCenterX-100,display.contentCenterY+200,60)
local test_stop = display.newText("Stop", display.contentCenterX-145,display.contentCenterY+180, native.systemFont, 45 )
test_stop:setTextColor(0)
test_stop:addEventListener("tap",  stop_calc)

Answer 3

使用此代碼。

本地t

本地計數= 1

局部函數loop_fun（）

如果Calculation_progress == true並且count <= 1000000，則

      messagge_obj.text="Calculation started"
      local messagge_loop=tostring(count) --- here is a simple model  
        print(messagge_loop)
        count = count + 1
        t = timer.performWithDelay( 0.1, loop_fun)

其他

      messagge_obj.text="Calculation done"
      timer.cancel(t)

結束

結束

並在calculation_progress標志之后在stop_calc（）中調用loop_fun（）。