Xamarin iOS - 如何让 StackLayout 自动调整嵌套内容的大小？

Question

我有以下 XAML :

 <StackLayout>
     <Grid IsVisible="{Binding isVisible}" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
                        <behaviors:Expander x:Name="MainExpander" CollapseAnimationLength="500" IsExpanded="false"  >
                            <behaviors:Expander.Header>
                                <Grid HorizontalOptions="FillAndExpand">                                  
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="100"/>
                                        <ColumnDefinition Width="10"/>
                                    </Grid.ColumnDefinitions>
                                    <Frame HeightRequest="40" WidthRequest="40" CornerRadius="20" HorizontalOptions="Start" VerticalOptions="Center" Margin="20" Padding="0" BackgroundColor="Maroon">
                                        <Label Text="{Binding student_initial}" TextColor="White" HorizontalOptions="Center" VerticalOptions="Center" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" />
                                    </Frame>
                                    <StackLayout Grid.Column="2" HorizontalOptions="StartAndExpand" VerticalOptions="Center" Margin="20">
                                        <Label x:Name="StudentName" Text="{Binding student_fullname}"></Label>
                                        <Label x:Name="StudentID" IsVisible="false" Text="{Binding student_unique_id}"></Label>
                                    </StackLayout>
                                </Grid>
                            </behaviors:Expander.Header>
                            <Grid RowSpacing="0" HorizontalOptions="FillAndExpand" HeightRequest="240" VerticalOptions="FillAndExpand">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <Button Grid.Row="0" Text="Messages" Clicked="Button_Clicked"></Button>
                                <Button x:Name="btnTopUp" Grid.Row="1" Text="Quick Topup" Clicked="Button_Clicked" IsVisible="{Binding topup_product_id, Converter={StaticResource IsNotNullOrEmptyConverter}}"></Button>
                                <Button Grid.Row="2" Text="Payments" Clicked="Button_Clicked"></Button>
                            </Grid>
                            <!--TODO: Look at adding a balance for childrens topups?-->
                        </behaviors:Expander>
                    </Grid>
                        </StackLayout>

我正在尝试按如下方式隐藏和显示网格：

<Grid IsVisible="{Binding isVisible}" ...

问题是没有任何显示，因为 StackLayout 似乎无法计算出它需要多高。我无法明确设置高度属性，因为它取决于扩展器是否展开。有没有办法使堆栈布局高度自动调整大小？谢谢。

Answer 1

将 StackLayout 替换为 Grid ，将其 HorizontalOptions 和 VerticalOptions 设置为 Start .

 <Grid BackgroundColor="Red" HorizontalOptions="Start" VerticalOptions="Start">
        <Grid  IsVisible="false" ...

在所有场景中查看以下屏幕截图（红色代表根网格）

Xamarin iOS - 如何让 StackLayout 自动调整嵌套内容的大小？

Xamarin iOS - How to get StackLayout to auto size to nested contents?

xaml

xamarin.ios

xamarin

xamarin.forms

束带隐形

网格可见（none-展开）

网格可见（展开）