如何使用 xamarin 在 StackLayout 中放置 5 列而不超出框架

Question

I want to put 5 columns together in StackLayout without going out of the frame. In iPhone 12Pro Max everything is ok, but in Iphone 8 things don't look good.

My Code:

<Frame
                   BorderColor="White"
                   Margin="10,0,10,0"
                   CornerRadius="10"
                   HasShadow="True"
                   BackgroundColor="Transparent">
                 <RelativeLayout>
        <Image
            x:Name="ImageDescriptionForecast1"
            Aspect="AspectFill"
            RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent,
                                                                   Property=Height,
                                                                   Factor=1}"
            RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent,
                                                                  Property=Width,
                                                                  Factor=1}"/>
        <StackLayout>
                    <Label x:Name="DateTimeForecast1"
                               Style="{StaticResource labelStyle}"
                               HorizontalTextAlignment="Center"
                               VerticalTextAlignment="Center"
                               VerticalOptions="Center"
                               FontSize="14"/>
                    <Label x:Name="DateTimeForecast2"
                               Style="{StaticResource labelStyle}"
                               HorizontalTextAlignment="Center"
                               FontSize="14"/>
                    <Grid BackgroundColor="Transparent" 
                      Padding="0,0,0,0"
                          RowSpacing="0"
                          ColumnSpacing="0">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                            <RowDefinition Height="auto" />
                        </Grid.RowDefinitions>

                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        ........
                        ........
                        </Grid>
                <StackLayout>
            </RelativeLayout>
         </Frame>

I tried to put "auto" on ColumnDefinition Width = "auto" but this not work for me. Is there a way to fit them on display?

Answer 1

When we check document Xamarin.Forms Grid ,we will find that

So when the size of the item in the grid is large enough, it will take up a lot of space in the space even if we set value auto to ColumnDefinition .

If we want the items in the same row take up the same space, we usually set * for ColumnDefinition . In this condition, if a row have many items and a single item take up a lot of space, all elements in a row will not be fully displayed on the screen.

In this condition, we need to adjust the HeightRequest and WidthRequest of the item.

For example:

   <Frame Grid.Row="0"  
          HeightRequest="30" WidthRequest="30"
          BackgroundColor="Yellow"
         <Grid.Column="0">
            <Image Source="watermelon.png" HorizontalOptions="FillAndExpand" 
                   VerticalOptions="FillAndExpand" Aspect="AspectFill" />
   </Frame>

For some mobile desktop applications, if there are more columns, each item will be resized to a smaller size. Similarly, if there are fewer columns, then each item will be resized to a larger size.