在 Corona SDK 中没有获得正确的滚动视图

Question

我在查看记分牌时遇到问题。我正在为我的滚动视图和滚动视图中的内容提供初始值。最初我打开记分板时，内容显示在正确的位置，但是当我向下然后向上滚动时，它没有得到它的初始位置。 请查看随附的记分牌视图截图。谁能告诉我在这种情况下该怎么办？

提前致谢。

local function scrollListener( event )
    local phase = event.phase
    if phase == "began" then 
        print( "Scroll view was touched" )
        for key,value in pairs(event) do 
            print("pranav",key,value) 
        end

    elseif phase == "moved" then 
        --print( "Scroll view was moved" )
        print("over",event.x)

        if(event.x>414)then
            event.x=358
        end

    elseif phase == "ended" then
        print( "Scroll view was released" )
        print("ended",event.x)
    end

    -- In the event a scroll limit is reached...
    if event.limitReached then
        if event.direction == "up" then 
            print "Reached top limit" 
        elseif event.direction == "down" then 
            print "Reached bottom limit" 
        elseif event.direction == "left" then 
            print "Reached left limit"
        elseif event.direction == "right" then 
            print "Reached right limit" 
        end
    end

    return true
end

scrollView = widget.newScrollView
{
    top = 200,
    left = 250,
    width = 500,
    height = 400, 

    scrollWidth = 500,
    scrollHeight = 10,

    topPadding = 0,
    bottomPadding = 0,
    leftPadding = 0,
    rightPadding = 0,

    friction = .972 , -- how fast the scroll view moves.  default is .972

    hideBackground = true, -- if true it wont show the background color.
    horizontalScrollDisabled = true,
    verticalScrollDisabled = false,          

    listener = scrollListener,
}

Answer 1

缺少显示内容添加的代码，即仅使用问题中的代码无法重现问题。发布代码的一个问题是height vs scrollHeight：

您的滚动文本height 应该是屏幕上的高度；它的scrollHeight 应该是“虚拟高度”，即如果它不可滚动，小部件将占据的总高度。因此scrollHeight 必须足够大以显示您插入其中的所有显示对象，而height 只是您要显示的“窗口”（部分）。 width 与 scrollWidth 也是如此，但你没有使用水平滚动，所以现在不用担心。

我也找不到任何对填充属性（topPadding 等）的引用，但拥有它们并没有给我带来任何问题。

我在您的代码后添加了以下内容：

local function createText(text, y)
    local scrollText = display.newText {
        text=text, y=y, font=native.systemFont, fontSize=20 }
    scrollText.anchorX = 0
    return scrollText
end
scrollView:insert(createText("Hi",    10))
scrollView:insert(createText("Bye",   30))
scrollView:insert(createText("Hello", 50))
scrollView:insert(createText("Hi",    70))
scrollView:insert(createText("Bye",   90))
scrollView:insert(createText("Hello", 110))
scrollView:insert(createText("Hi",    130))
scrollView:insert(createText("Bye",   150))
scrollView:insert(createText("Hello", 170))

当用

创建时

scrollView = widget.newScrollView
{
    ...

    width = 200,
    height = 100, -- portion of scrollable area you want to see

    scrollWidth = 200,
    scrollHeight = 200, -- complete content area

    ...
}

（只是与您的代码有所不同）它工作得很好。即，交换 height 和 scrollHeight 值。