Kivy 滚动视图不滚动

Question

我是第一次使用 kivys 滚动视图小部件，但我不确定如何得到它运行。我想向上滚动并通过不同的标签完成。

我怎样才能做到这一点？

滚动视图小部件需要哪些属性？我可以使用任何布局吗？

谢谢

目前无法使用的代码：

<YearLabel@ButtonBehavior+Label>:
<YearScreen>:
    canvas.before:
        Color:
            rgba: 1,1,1,0.25
        Rectangle:
            pos: self.pos
            size: self.size


    canvas.after:
        Color:
            rgba : 0,0,0,1
        Rectangle:
            pos: 160,1560
            size: 419,60


    ScrollView:
        scroll_timeout: 250
        scroll_distance: 20
        do_scroll_y: True
        do_scroll_x: False
        height: 100
        GridLayout:
            cols : 1
            spacing: 10
            padding: 10
            height: 50
            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2020"
                color: 0,0,0,1
                pos : 0,1200
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2021"
                color: 0,0,0,1
                pos: 0,900
                font_size: "120sp"
            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2022"
                color: 0,0,0,1
                pos: 0,600
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2023"
                color: 0,0,0,1
                pos: 0,300
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2024"
                color: 0,0,0,1
                pos: 0,0
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2025"
                color: 0,0,0,1
                pos: 0,-300
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2026"
                color: 0,0,0,1
                pos: 0,-600
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2027"
                color: 0,0,0,1
                pos: 0,-900
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2028"
                color: 0,0,0,1
                pos: 0,-1200
                font_size: "120sp"

            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2029"
                color: 0,0,0,1
                pos: 0,-1500
                font_size: "120sp"


            YearLabel:
                id: year_label
                font_name: "Fonts/sans-serif.ttf"
                text : "2030"
                color: 0,0,0,1
                pos: 0,-1800
                font_size: "120sp"

Answer 1

如果 ScrollView 的子项 (GridLayout) 小于 ScrollView，则 ScrollView 将不起作用。通常，GridLayout 足以容纳其所有子项（YearLabels）。方便的是，GridLayout 可以计算出该大小。这是使用它的 kv 的修改版本：

ScrollView:
    scroll_timeout: 250
    scroll_distance: 20
    do_scroll_y: True
    do_scroll_x: False
    GridLayout:
        cols : 1
        spacing: 10
        padding: 10
        size_hint_y: None  # required since we are setting height
        height: self.minimum_height  # let GridLayout calculate height

此外，我从 ScrollView 中删除了 height: 100，因为它没有效果。

为了让 GridLayout 计算 minimum_height，它的所有子项都必须具有明确定义的 heights。所以，我在你的 YearLabel 规则中添加了：

<YearLabel@ButtonBehavior+Label>:
    size_hint: 1, None
    height: dp(100)

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