Question

问题：我正在gridview内使用scrollview。问题是左上角的单元格从不滚动。

我尝试了其他所有单元格的许多不同组合，只有左上角不可滚动。

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:DigitalMenu"
             x:Class="DigitalMenu.MainPage">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <!-- TOP LEFT : This will NOT SCROLL :(-->
        <ScrollView Grid.Row="0" Grid.Column="0">
            <StackLayout>
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
            </StackLayout>
        </ScrollView>

        <!-- TOP RIGHT This will scroll-->
        <ScrollView Grid.Row="0" Grid.Column="1">
            <StackLayout>
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
            </StackLayout>
        </ScrollView>

        <!-- BOTTOM LEFT This will scroll-->
        <ScrollView Grid.Row="1" Grid.Column="0">
            <StackLayout>
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
            </StackLayout>
        </ScrollView>

        <!-- BOTTOM RIGHT This will scroll-->
        <ScrollView Grid.Row="1" Grid.Column="1">
            <StackLayout>
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
                <Button Text="Something" />
            </StackLayout>
        </ScrollView>

        <ListView>

        </ListView>
    </Grid>

</ContentPage>

Answer 1

您的左上方单元格无法滚动，因为您在该空间中放置了一个空列表视图。它将与原始滚动视图内容重叠，使您感觉像被卡住了。在代码的底部，您这样写：

<Grid>
    ...
    <ListView>
    </ListView>
</Grid>

如果未显式设置其行和列，则其将为0。由于Grid的功能，Grid会将其所有子级拉伸到整个空间。稍后设置的控件将位于topper层次结构中。

最后，空白列表视图使您无法触摸滚动视图。如果删除该列表视图，则可以滚动第一个单元格。

Answer 2

打开啤酒后，我有了一个绝妙的主意，那就是创建一个新的GridView并将ScrollView元素从前一个GridView移到后一个GridView，并且由于某种原因，它本身可以解决问题。我仍然不知道为什么会首先发生

为什么GridView滚动条中的左上方单元格没有显示？

2 个答案: